Home improvement and construction math, sorted by project: measuring and layout, paint and flooring coverage, framing and lumber, electrical and plumbing sizing, concrete and masonry, fasteners, and budgeting. Every calculator below works straight from the numbers on your tape measure or receipt.
Plan the quantity before you buy. Most of these calculators work out how much material a project needs, whether that is cubic yards of concrete for a slab, boards for a deck, gallons of paint for a room, tile for a backsplash, or shingles for a roof. Entering your measurements gives a number to take to the store, with a waste allowance for cuts and mistakes.
Other calculators help with layout and dimensions, such as stair rise and run, framing spacing, and rough openings for windows and doors, and others estimate cost so you can compare options and set a budget. Measure carefully, use the same units throughout, and double check anything structural.
The results are estimates for planning. Building codes, product specifications, and site conditions vary, so confirm the details with the manufacturer, your local building department, or a qualified professional before you start, especially for load bearing, electrical, and plumbing work.
Keep your drawings, measurements, and receipts together as you go. Writing down the dimensions you used makes it easy to recheck a result later, and saved numbers help when you need to order more material or repeat the project.
📐 Measuring & Layout 15
Blueprint Scale CalculatorA blueprint scale tells you how much smaller the drawing is than the real building. It is written either as an architectural scale (such as 1/4" = 1',...Board Foot CalculatorA board foot is the standard unit for measuring hardwood lumber volume – one board foot equals a piece 1 inch thick, 12 inches wide, and 12 inches...Ceiling Area CalculatorFor a flat rectangular ceiling, the area equals the floor footprint: measure length and width and multiply. The ceiling above a 12 by 16 ft room is 192...Circle Area CalculatorThe area of a circle is pi times the radius squared. The radius is the distance from the center to the edge – half the diameter. If you...Cut List CalculatorA cut list is the plan that turns a project into purchases: every piece you need, its length (and width for sheet goods), and how many. The calculator...Diagonal Pythagorean CalculatorFor any right triangle, the square of the long side (the hypotenuse or diagonal) equals the sum of the squares of the other two sides. In building terms:...Grade & Slope CalculatorGrade percent, angle, ratio and slope length with a visual triangle - for driveways, ramps, roofs and drainage.Linear Foot CalculatorA linear foot is simply one foot of length measured in a straight line – nothing more. It ignores width and thickness entirely. If you lay a tape...Material EstimatorEvery material estimate follows the same three steps: measure the project, divide by how much one unit covers, then round up and add waste. The only thing that...Miter Angle CalculatorA miter cut is an angled cut across the face of a board so two pieces meet to form a corner. Cut both ends to the right angle...Project Cost CalculatorA complete estimate has five parts: materials, labor, permits and fees, equipment or rental, and a contingency for the unexpected. Total the first four, add a contingency percentage...Room Area CalculatorFor a plain rectangular room, multiply length by width: a 12 by 16 ft room is 192 square feet. For square rooms, multiply the side by itself. For...Square Footage CalculatorSquare footage is area – length times width for a rectangle. Measure both sides in feet and multiply: a 12 by 16 ft space is 192 square feet....Wall Area CalculatorFor one wall, multiply its width by its height. For a whole room, add the lengths of all walls (the perimeter) and multiply by the ceiling height. Then...Waste Factor CalculatorA waste factor is the percentage you add to your measured quantity to cover material you cannot use: offcuts, broken pieces, pattern matching, and the occasional measuring error....
🌳 Outdoor & Landscaping 15
Compost CalculatorMeasure the area you are covering, decide how deep the compost layer should be, and convert that to volume. Multiply the area in square feet by the depth...Concrete CalculatorConcrete is figured by volume. Find the volume of the pour in cubic feet, divide by 27 for cubic yards, then add a waste factor because nobody wants...Deck Cost CalculatorA deck is priced by the square foot, but the total swings wildly with the decking material, whether you add railings and stairs, and who swings the hammer....Fence CalculatorA fence estimate is really four estimates in one: posts, boards or pickets, concrete for the post holes, and gates. Measure the run, pick a style and post...Garden Bed Soil CalculatorMultiply the bed length by width by depth to get the volume, then convert to bags or cubic yards. A 4 by 8 ft bed filled 12 in...Gravel CalculatorMultiply the area by the depth to get the volume, then convert to cubic yards and tons — because most suppliers sell gravel by the ton, not the...Lawn Fertilizer CalculatorLawn fertilizer is measured by the nitrogen it delivers, not by the bag. The standard target is about 1 lb of nitrogen per 1,000 sq ft per application....Mulch CalculatorMultiply the bed area by the depth to get the volume, then convert to cubic yards or bags. A 300 sq ft bed at 3 in deep needs...Paver CalculatorDivide the project area by the area of one paver, then add a waste factor for cuts and breakage. A 4 by 8 in paver covers about 0.22...Pond Volume CalculatorPond volume is the surface area times the average depth, converted to gallons. The key number is 7.48 — the gallons in a cubic foot. A rectangular pond...Retaining Wall Block CalculatorWork it out in two directions. The number of courses is the wall height divided by the block height; the blocks per course is the wall length divided...Seed Coverage CalculatorGrass seed is sold by the pound and applied at a rate per 1,000 sq ft, so the seed you need is your area divided by 1,000, times...Sod CalculatorSod is sold by the square foot, bundled into pieces and stacked on pallets, so the amount you need is simply your lawn area plus a waste allowance...Soil CalculatorSoil is sold by volume, so the amount you need is the area times the depth. Work in feet: a bed that is length times width times depth...Sprinkler Coverage CalculatorStart from the spray radius, not the area. The golden rule of sprinkler design is head-to-head coverage: heads are spaced one radius apart, so the spray from each...
📐 Woodworking & Carpentry 14
Cabinet Door Size CalculatorMost people reach for a cabinet door calculator thinking the hard part is the math. It is not. The math is simple addition. The hard part is knowing...Deck Board CalculatorIt looks like a simple multiplication, and then you meet the lumber industry. A board sold as 5/4x6 is not 6 inches wide, your gaps eat into the...Deck Stairs CalculatorHome » DIY & Construction CalculatorsCALCULATOR Enter the total height from the ground to the top of your deck, and […]Dovetail Spacing CalculatorMost dovetail calculators hand you a spacing number and leave. But almost no woodworker is actually asking what the spacing is — they are asking whether the layout...Drawer Box CalculatorA drawer box is unforgiving. Build it a sixteenth too wide and the slides bind; build it too narrow and the drawer rattles. The single number that decides...Fence Board CalculatorStart with the run length and the style. Divide the fence length by the coverage of one board — its width plus the gap — and you have...Finish Nail CalculatorCount the linear feet of trim, decide how often a nail goes in, and multiply by the number of rows. Baseboard and crown usually take two rows of...Lumber CalculatorPick the size and length, enter how many pieces, and this calculator returns the figures every lumber order needs: linear feet, board feet, face square footage, cubic volume,...Plywood Sheet CalculatorThere are two honest ways to answer. For sheathing and flooring, divide the area you are covering by the area of one sheet and add waste. For cabinets...Pocket Hole Spacing CalculatorPocket holes are forgiving, but spacing them by eye leads to a joint that either wobbles or wastes screws. The rule of thumb is a hole every 6...Shelf Span CalculatorA shelf is just a beam, and every beam droops under load. The amount it droops depends on the span, how much weight sits on it, how thick...Stair Stringer CalculatorStart with the total rise — the vertical distance from the lower finished floor to the upper one. Divide it by a comfortable riser height (around 7-1/2 in)...Trim Molding CalculatorMeasure the perimeter of the room, subtract the door openings, add a waste factor for miter cuts and mistakes, then divide by the length of the stock you...Wood Glue Coverage CalculatorGlue is sold by the bottle, not the square foot, so the real question is how many bottles to grab. Work out the area of the joint surface,...
⚡ Electrical & Lighting 13
Battery Backup CalculatorBattery runtime comes down to usable energy divided by the load. A battery stores energy in watt-hours: amp-hours times voltage. But you never get all of it —...Circuit Load CalculatorA circuit is overloaded when the current drawn by everything plugged in exceeds what the breaker is rated to carry. Current in amps is the load in watts...Conduit Fill CalculatorConduit fill is the percentage of a conduit's internal area taken up by the wires inside it. The National Electrical Code caps that percentage so wires can dissipate...Dimmer Load CalculatorTwo things decide whether a dimmer works with a load: the wattage and the dimming technology. The wattage is easy — add up your fixtures and stay under...EV Charger Circuit CalculatorEV charging is a continuous load — it runs for hours — so the NEC requires the circuit to be sized at 125 percent of the charger's current....Generator Size CalculatorSizing a generator is not just adding up watts. You need the total running watts of everything that will run at once, plus enough extra to cover the...LED Strip Length CalculatorAn LED strip install comes down to three numbers: how much power the strip draws, how big a driver it needs, and how far it can run before...Lighting Layout CalculatorGood lighting is two questions, not one: how much light, and where to put it. The amount comes from the lumen method — multiply the target light level...Outlet Spacing CalculatorThe answer comes from one NEC rule that surprises people: no point along the floor line of a wall may be more than 6 feet from a receptacle....Panel Load CalculatorThis is the question that shows up right before an expensive project — an EV charger, a hot tub, a heat pump, a kitchen remodel. The answer comes...Recessed Light Spacing CalculatorThe fast answer is the rule of thumb: space recessed lights about the ceiling height divided by two. An 8 ft ceiling gives roughly 4 ft between cans,...Solar Panel CalculatorIt comes down to three numbers: how much electricity you use, how much sun your location gets, and how big each panel is. Take your monthly usage in...Wire Gauge CalculatorTwo things decide wire size, and the bigger of the two wins. First, ampacity: the wire has to carry the current without overheating, which sets a minimum gauge...
📐 Concrete & Masonry 12
Block Wall CalculatorConcrete block is estimated from the wall area. A standard CMU has a 16 by 8 inch face, which covers about 0.89 square feet, so a wall needs...Brick CalculatorBrick is estimated from the wall area and the bricks per square foot, which depends on the brick size and the mortar joint. A standard modular brick with...Concrete Bag CalculatorPeople buy concrete by the bag, not the cubic yard, so the useful answer is a bag count. First find the volume of your pour from the project...Concrete Footing CalculatorHome » DIY & Construction CalculatorsCALCULATOR Size the concrete for your footings or piers. Choose the shape, enter the dimensions […]Concrete Sealer CalculatorSealer is bought by the gallon, so the real question is how many gallons to buy. Take the area to be sealed, multiply by the number of coats,...Concrete Slab CalculatorConcrete for a slab is volume: length times width times thickness. Multiply the length and width in feet, multiply by the thickness in feet (inches divided by 12),...Footing Size CalculatorA footing is sized to spread the load onto the soil without overloading it. The required bearing area equals the load on that footing divided by the soil...Mortar CalculatorMortar is estimated from how much masonry you are laying. For brick and stone it scales with wall area; for block it scales with the number of units....Post Hole CalculatorConcrete for a post hole is the volume of the hole minus the post that sits in it. For a round hole that is the diameter and depth...Rebar CalculatorRebar is laid out on a spacing, so the quantity comes from the area or wall and the bar spacing, not a single number. For a slab grid...Soil Bearing Capacity CalculatorFooting size for a given load and soil - required area, actual bearing pressure and pass/fail.Stone Veneer CalculatorStone veneer is sold as two separate products that are bought and priced differently. Flats are the field pieces that cover the open face of a wall and...
📐 Flooring & Tile 12
Carpet CalculatorMeasure the room length and width, pick the roll width, and the calculator works out how many full-width strips it takes, the roll length to buy, and the...Floor Leveling Compound CalculatorMultiply the floor area by the average thickness to get the volume, then divide by the yield per bag. A 50 lb bag of self-leveler yields roughly 0.45...Flooring CalculatorMeasure each room, add a waste allowance for cuts and the install pattern, then divide by the coverage per carton and round up. Buy whole cartons from one...Grout CalculatorGrout fills the joints, so the math is about total joint volume, not floor area alone. Smaller tiles mean more joints per square foot and more grout; wider...Hardwood Flooring CalculatorMeasure each room, add a waste factor for cuts, grading defects, and the install pattern, then divide by the carton coverage and round up to whole cartons. Buy...Laminate Flooring CalculatorMeasure each room, add a waste factor for cuts and mistakes, then divide by the coverage per box and round up to whole boxes. Laminate is a floating...Radiant Heat Flooring CalculatorRadiant floor heating warms a room from the floor up using either electric heating mats/cables or hydronic (warm-water) tubing under the floor. Instead of blowing hot air, the...Subfloor Plywood CalculatorMeasure the floor area, add a little waste for cuts around the perimeter and openings, divide by 32 sq ft per sheet, and round up. Then match the...Tile CalculatorFind the area, add a waste factor for cuts and breakage, then divide by the coverage per tile (for a tile count) and per box (for boxes). Tile...Transition Strip CalculatorA transition strip is the trim that bridges the gap where one floor meets another – at doorways, between rooms, at the top of stairs, or where flooring...Underlayment CalculatorUnderlayment is the thin layer that goes between your subfloor and a floating floor. It cushions the floor, smooths minor subfloor imperfections, quiets footsteps, and – with a...Vinyl Plank CalculatorMeasure the room area, add a waste factor for cuts and the stagger pattern, then divide by the coverage per box and round up. Buy an extra box...
🎨 Painting & Finishing 12
Caulk CalculatorCaulk usage depends on three things: the total length of the joints, and the width and depth of the bead. Multiply them for the volume of caulk, then...Chalk Paint CalculatorHome » DIY & Construction CalculatorsCALCULATORCalculate how much chalk paint you need for a furniture or accent project. Area to […]Drywall Mud CalculatorJoint compound usage depends on the drywall area and the finish level. As a rule of thumb, a 5-gallon bucket of all-purpose mud finishes about 450-500 sq ft...Epoxy Floor Coating CalculatorStart with the floor area, pick the epoxy type (which sets coverage), and choose one or two coats. A gallon of 100% solids epoxy covers roughly 200 sq...Paint Cost CalculatorHome » DIY & Construction CalculatorsCALCULATOR Enter the wall area you are covering and this estimates how many gallons to […]Paint Coverage CalculatorPaint covers wall area, not floor area. Find the wall area (room perimeter times ceiling height), subtract the doors and windows, multiply by the number of coats, and...Paint Mixing Ratio CalculatorA ratio like 4:1:1 lists parts by volume in order – usually paint (or clear), then hardener (activator), then reducer (thinner). 4:1:1 means 4 parts paint, 1 part...Primer CalculatorPrimer seals the surface, blocks stains, and gives paint something uniform to grip. Prime when you are painting bare drywall, raw wood, fresh masonry or metal; covering stains,...Sealant CalculatorMeasure the joint width and depth and the total linear feet. Multiply width by depth by length for the volume, then divide by the cartridge volume. A standard...Spray Paint CalculatorEstimate the surface area of your object, pick the surface type and number of coats, then divide by the per-can coverage and add for overspray. A 12 oz...Stain Coverage CalculatorFind the surface area, pick the stain type and wood texture, and divide by the coverage rate. Smooth, new wood with a semi-transparent stain runs about 250-400 sq...Wallpaper CalculatorIt is not simply wall area divided by roll area. You hang full-height vertical strips, so you lose the offcut at the bottom of each strip – and...
💰 HVAC & Energy 11
Air Conditioner Size CalculatorAir conditioner sizing starts with the room area and a baseline of about 20 BTU per square foot, then adjusts for the things that add or shed heat:...Attic Insulation CalculatorAttic insulation is measured in R-value, the resistance to heat flow. To find how much you need, compare your target R-value to what you already have. Estimate your...BTU CalculatorA BTU, or British Thermal Unit, is the amount of heat needed to raise one pound of water by one degree Fahrenheit. For heating and cooling, equipment is...Duct Size CalculatorDuct size depends on the airflow it must carry, measured in cubic feet per minute, and the speed you want that air to travel. Too small and the...Energy Savings CalculatorThat is the real question behind every home energy upgrade, and it is the one this calculator answers in dollars. Pick the upgrade you are considering, enter your...Heat Loss CalculatorHeat loss is the rate at which your home leaks warmth to the outdoors on a cold day, measured in BTU per hour. By itself that number is...Mini Split Sizing CalculatorMini splits are sold in fixed sizes, so the real question is which size to buy. This calculator turns your room into a recommended unit, not just a...Room Heater Size CalculatorYou are standing in a cold room and you want to know which heater to buy, not a physics lecture. This calculator turns your room into a heater...Thermostat Savings CalculatorThat is the real question, and this calculator answers it in dollars and payback months rather than a vague percentage. Pick your thermostat type, climate, and how far...Ventilation CalculatorVentilation is measured two ways: air changes per hour, or ACH, which is how many times the air in a room is fully replaced each hour, and CFM,...Whole House Fan CalculatorA whole house fan cools your home by pulling cool outdoor air in through open windows and pushing hot indoor air up into the attic and out the...
📐 Walls & Drywall 10
Acoustic Panel CalculatorAcoustic treatment is sized by coverage – the share of your wall (and sometimes ceiling) area covered by absorptive panels. Find the treatable surface, pick a target coverage...Corner Bead CalculatorCorner bead is the rigid strip – metal, vinyl, or paper-faced – fastened to an outside drywall corner to give it a straight, durable edge. It protects the...Drywall Screw CalculatorScrew count comes from the number of sheets, the sheet size, whether it is a wall or ceiling, and the fastener spacing. As a rule of thumb that...Drywall Sheet CalculatorAdd up the wall area (perimeter times ceiling height) plus the ceiling if you are hanging it, subtract large openings if you choose to, add a waste factor,...Insulation CalculatorStart with the recommended R-value for your climate zone and the part of the house you are insulating, convert that to a thickness for the material you chose,...Joint Tape CalculatorTape covers every seam between sheets plus the inside corners. Estimate the seam length from the wall (and ceiling) area – smaller sheets mean more seams – add...Shiplap CalculatorMeasure the wall area, decide your board width and the reveal (gap) between boards, then divide the area by how much one board covers and add waste for...Soundproofing Material CalculatorThis is the single most common mix-up, and it sends people to the wrong product. Sound absorption – foam and acoustic panels – reduces echo and reverb inside...Stud Count CalculatorCount the studs along the wall at your spacing, then add one for the end. The standard formula is the wall length in inches divided by the spacing,...Wainscoting CalculatorGood wainscoting is about even, well-proportioned panels – not leftover slivers in the corners. Pick a target panel width, and the planner divides the wall into equal panels...
📐 Storage & Organization 10
Attic Storage CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate usable attic storage area and the decking to cover it. Enter the attic size […]Closet Rod CalculatorHome » DIY & Construction CalculatorsCALCULATORSee how many clothes fit on a closet rod, or check whether your wardrobe will […]Garage Floor Coating CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate how much epoxy or floor coating your garage needs. Enter the floor size, number […]Garage Wall Cabinet CalculatorHome » DIY & Construction CalculatorsCALCULATORSee how many wall cabinets fit on a garage wall. Enter the wall length and […]Moving Box CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate how many moving boxes you need by home size and how much you own. […]Murphy Bed Space CalculatorHome » DIY & Construction CalculatorsCALCULATORPlan the space for a Murphy (wall) bed. Pick the bed size and orientation to […]Pantry Shelf CalculatorHome » DIY & Construction CalculatorsCALCULATORPlan pantry shelving. Enter the pantry size and shelf spacing to get the number of […]Pegboard Layout CalculatorHome » DIY & Construction CalculatorsCALCULATORPlan a pegboard for tool storage. Enter the wall space and hole spacing to get […]Shelf Weight Capacity CalculatorHome » DIY & Construction CalculatorsCALCULATORFind how far apart to place shelf supports so the shelf does not sag. Pick […]Storage Unit Size CalculatorHome » DIY & Construction CalculatorsCALCULATORFind the self-storage unit size you need. Enter how many bedrooms of belongings you are […]
📐 Kitchen & Bath 10
Backsplash Tile CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate tile for a kitchen or bath backsplash. Enter the wall size and tile size […]Bathroom Fan Size CalculatorHome » DIY & Construction CalculatorsCALCULATORSize a bathroom exhaust fan. Enter the room dimensions to get the minimum airflow (CFM) […]Bathroom Remodel Budget CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate a bathroom remodel budget. Enter the size and a quality tier to get a […]Bathroom Vanity Size CalculatorHome » DIY & Construction CalculatorsCALCULATORFind the right vanity size for a bathroom. Enter the available wall width to get […]Cabinet Layout CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate how many base and wall cabinets a kitchen run needs. Enter the run lengths […]Countertop CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate countertop material for a kitchen or bath. Enter the counter run, depth, and any […]Kitchen Island Size CalculatorHome » DIY & Construction CalculatorsCALCULATORSee what size kitchen island fits your space. Enter the open floor area and the […]Range Hood Size CalculatorHome » DIY & Construction CalculatorsCALCULATORSize a kitchen range hood. Enter the cooktop width and type to get the recommended […]Shower Pan Tile CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate tile for a shower pan and walls. Enter the shower size, tile height, and […]Sink Cutout CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate the countertop cutout for a kitchen or bath sink and the cabinet width it […]
📋 Budget & Planning 10
Contractor vs DIY Cost CalculatorCompare the true cost of doing a project yourself versus hiring a contractor, with a savings estimate and a clear recommendation.DIY Project Budget CalculatorBuild a complete project budget across materials, tools, labor, and contingency, with overrun risk and a recommended budget.Home Value ROI CalculatorSee how much value a renovation adds to your home and whether the return justifies the cost.Labor Time EstimatorEstimate how many hours and days a DIY project will take based on size, skill level, crew, and complexity.Material Markup CalculatorPrice jobs with the right markup or margin, including labor, overhead, tax, and delivery.Material Waste Cost CalculatorFigure out how much extra material to buy for waste and what that overage really costs.Permit Cost EstimatorEstimate building permit fees by project type and location, including inspections and plan review.Project Timeline CalculatorTurn a project into a real schedule with start and finish dates, phases, milestones, and a delay-risk estimate.Subcontractor Cost CalculatorBreak down a trade by labor, materials, and markup, then roll several subcontractors into a full project total.Tool Rental Cost CalculatorDecide whether to rent or buy a tool, with all-in rental costs, a break-even point, and a recommendation.
📐 Doors & Windows 10
Door Rough Opening CalculatorHome » DIY & Construction CalculatorsCALCULATORFrame a door opening right the first time. Enter the door size and configuration to […]Door Swing Clearance CalculatorHome » DIY & Construction CalculatorsCALCULATORFind the floor space a hinged door needs to swing, and check whether it fits. […]Egress Window Well CalculatorHome » DIY & Construction CalculatorsCALCULATORCheck whether a bedroom or basement window meets IRC R310 emergency-escape requirements, including the window […]Glass U Value Energy Loss CalculatorHome » DIY & Construction CalculatorsCALCULATORSee what a lower-U-factor window saves over a heating season. Enter the glass size, the […]Header Size CalculatorHome » DIY & Construction CalculatorsCALCULATORGet the header framing right: how many jack studs, how much bearing, when a flat […]Shutter Size CalculatorHome » DIY & Construction CalculatorsCALCULATORSize exterior shutters for a window. Enter the window dimensions and shutter type to get […]Weatherstripping CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate how much weatherstripping to buy to seal doors or windows. Enter the size and […]Window Energy Loss CalculatorHome » DIY & Construction CalculatorsCALCULATOREstimate how fast heat moves through a window. Pick the window type or enter a […]Window Replacement Cost CalculatorHome » DIY & Construction CalculatorsCALCULATORBudget a window replacement project. Pick a material for a typical installed price, set the […]Window Rough Opening CalculatorHome » DIY & Construction CalculatorsCALCULATORSize a window rough opening for new framing. Enter the window dimensions and your shim […]
📐 Plumbing 10
Drain Slope CalculatorCalculate the total vertical drop and grade for a gravity drain line.Expansion Tank CalculatorSize a thermal expansion tank for a closed plumbing or hydronic system.Faucet Flow Savings CalculatorSee how much water and money a low-flow faucet saves over a year.PEX Length CalculatorCalculate the total PEX tubing to buy for a set of supply runs, including a waste allowance.Pipe Sizing CalculatorRecommend a pipe diameter for a given flow rate, keeping velocity within safe limits.Pipe Volume CalculatorCalculate the volume of water held inside a pipe from its inside diameter and length.Septic Tank Size CalculatorFind the minimum septic tank size for your home by bedroom count and occupancy.Sump Pump Size CalculatorEstimate the pump capacity and horsepower needed to keep up with water inflow.Water Flow Rate CalculatorEstimate the water flow rate through a pipe from its inside diameter, supply pressure, and run length.Water Heater Size CalculatorEstimate the water heater tank size and first-hour rating for your household.
📐 Roofing & Exterior 10
Drip Edge CalculatorDrip edge is the L-shaped or T-shaped metal flashing installed along the edges of a roof, at the eaves and rakes, to direct water away from the fascia...Fascia Board CalculatorFascia is the long, flat board that runs horizontally along the edge of the roof, capping the ends of the rafters or trusses. It is the band you...Gutter Size CalculatorA gutter system has to do two things: catch the water running off the roof and move it down to the ground before it spills over. That means...House Wrap CalculatorHouse wrap is sold in rolls, so the real answer is how many rolls to buy, not a raw square footage. Start from your total exterior wall area,...Ice Water Shield CalculatorIce and water shield is a self-adhered, fully waterproof membrane that goes under the shingles at the most leak-prone parts of a roof: the eaves, where ice dams...Ridge Cap CalculatorRidge caps are the shingles that fold over the peak and edges of a roof, and they are the material homeowners most often underestimate, ending up one bundle...Roof Pitch CalculatorRoof pitch is how steep a roof is, expressed as the rise in inches for every 12 inches of horizontal run. A 6:12 pitch rises 6 inches over...Roofing Shingle CalculatorShingles are sold by the bundle, and most field shingles take three bundles to cover one roofing square, which is 100 square feet. So the chain is simple:...Siding CalculatorSiding is bought by the carton or square, so the useful answer is a carton count, not a bare square footage. Start from the wall area, either entered...Soffit CalculatorSoffit is the material that closes the underside of the roof overhang, running along the eaves between the fascia and the wall. To size it, multiply the eave...
📐 Fasteners & Hardware 9
Anchor Load CalculatorAnswering that means comparing two numbers: the load on each anchor and what the anchor can actually carry in that base material. Take the total load, divide by...Bolt Spacing CalculatorBolt spacing balances two limits: bolts must be far enough apart to install and to avoid tearing the material between them, and far enough from the edge to...Drawer Slide CalculatorDrawer slide size comes from two cabinet dimensions: the opening width sets the drawer box width and the clearance, and the cabinet depth sets the slide length. For...Hinge Placement CalculatorHinge placement follows a simple rule: set the top and bottom hinges a fixed distance from each end, then space any middle hinges evenly between them. A common...Joist Hanger CalculatorYou need one hanger for every joist end that lands on a ledger or beam, and a specific number of fasteners for every hanger. Count the joists from...Lag Bolt CalculatorPicking a lag bolt means matching the diameter and length to the load, the base material, and how deep the threads can bite. Bigger diameter and deeper thread...Nail Quantity CalculatorNail quantity comes from how many fastening points your project has, which depends on the area or length, the spacing, and how many nails land at each point....Post Base CalculatorEvery post that lands on concrete or a beam needs its own base, and every base needs its own little kit of hardware: an anchor into the substrate...Screw Quantity CalculatorScrew quantity comes from how much material you are fastening and how densely, then you add a waste factor and convert to the box you actually buy. A...