Lighting Calculators - Formula Factory

⭐ Popular

Beam Angle CalculatorKnow the pool size you want and how far the fixture sits? Find the beam angle — the optic — you need to buy.Room Lumens CalculatorTotal lumens needed to light a room to a target illuminance.How Many Recessed Lights Do I Need?How many recessed lights do you need? The answer depends on your room size, ceiling height, and fixture output — but most rooms follow a simple spacing rule that…Lux at Distance CalculatorFind the illuminance on a surface from a point source using the inverse-square law.LED Driver CalculatorSize the correct LED driver for any application. Calculates required wattage, applies the 80% safety margin, checks thermal derating, and recommends dimming…Kitchen Lighting CalculatorDesign a complete layered kitchen lighting plan — ambient recessed, task under-cabinet, island pendants, and accent.

🔦 Photometry, Beam, Color & Units 32

Beam Angle CalculatorKnow the pool size you want and how far the fixture sits? Find the beam angle — the optic — you need to buy.Beam Distribution SelectorSelect the optimal photometric distribution type for any lighting application. Covers road and area lighting (IESNA Type I-V), interior distributions (batwing…Beam Spread CalculatorEnter a beam angle and throw distance to see how wide the beam lands — its diameter and lit area. Drag the sliders and watch the cone update.Candela Distribution CalculatorThe total light a source emits in every direction — the size of the bucket of light.Candela to Lumens ConverterCandela and lumens aren't a fixed conversion — they're linked by how wide the beam is.Color Temperature GuideCRI measures how accurately a light source renders colors compared to natural daylight (CRI 100).CRI to TM-30 EstimatorCRI is a single average over 8 pastel samples; TM-30 measures fidelity (Rf) and gamut (Rg) across 99 samples plus per-hue shifts.Fixture Count EstimatorHow much total light does the room need? Calculates required lumens based on room size, activity level,Foot-Candles to Lux ConverterConvert illuminance from foot-candles to lux.Glare Rating CalculatorCalculate Glare Rating (GR) for sports and outdoor lighting, Threshold Increment (TI) for road lighting disability glare, and veiling luminance for any combination…IES File ReaderAn IES file is a text-based photometric data file that describes exactly how a light fixture distributes light in three dimensions — every angle, every candela…Illuminance Uniformity CalculatorTwo rooms can report the same 500 lux average and feel completely different. The average says nothing about distribution — uniformity does.Inches to Millimeters ConverterConvert between inches and millimetres — fractions included — built for lighting hardware, optics, extrusions and CNC work, not just a number box.Kelvin Colour Temperature GuideFind the right colour temperature for any space. Enter a Kelvin value to see its appearance, recommended applications, and how it compares to every common light…Lighting Terminology FinderThe pairs people mix up most — with the one-line difference and the calculator that settles it.Lighting Units Converter — All-in-One☀ Illuminance 💡 Flux 🔦 Intensity 📐 Photometric ⚡ Efficacy 🔌 Electrical 📋 Reference ☀ Lux (lx) Light arriving at Lumens to Lux ConverterConvert total lumens spread over an area into average illuminance (lux).Lumens to watts converterEstimate wattage from a lumen output and the source efficacy.Lux at Distance CalculatorFind the illuminance on a surface from a point source using the inverse-square law.Lux to foot-candles converterConvert illuminance from lux to foot-candles.Meter to Feet ConverterMeters ↔ Feet Converter Instantly convert between meters and feet for lighting calculations, mounting heights, room dimensions,Mounting Height OptimizerLeave at 0 to auto-calculate recommended spacing.Natural vs artificial light balanceInstall dimmable fixtures on daylight zones. Set occupancy + photosensor dimming to reduce artificial output when windows provide adequate lux.Optic Selection CalculatorSelect the optimal beam angle optic for any fixture, mounting height, and target area.Optical Loss CalculatorBuild a complete lumen loss budget for any LED luminaire — from driver input to delivered lumens on the target surface.Percent to Decimal CalculatorPercent ↔ Decimal Converter Convert between percentage and decimal form — used throughout lighting calculations for CU,Polar Plot GeneratorBuild and visualize IES-style polar intensity distribution curves. Enter candela values by angle, load TIR Lens CalculatorCalculate TIR (Total Internal Reflection) lens specifications — efficiency, critical angle, Fresnel losses, lens diameter, and working distance for any LED source…UGR CalculatorCalculate Unified Glare Rating (UGR) for any room and luminaire combination. Check compliance against EN 12464-1 limits for offices, classrooms, healthcare, and…Up/Down Light Ratio CalculatorCalculate illuminance on the task plane and ceiling from any luminaire up/down distribution ratio.Wall Wash Lighting CalculatorCalculate the fixture spacing, count, and vertical illuminance for wall washing or wall grazing any architectural surface.Watts to lumens converterEstimate lumen output from wattage and the source efficacy.

🏠 Residential & Rooms 25

Bathroom Lighting CalculatorDesign a complete layered bathroom lighting scheme — ambient ceiling, vanity task, shower zone, and accent.Bedroom LightingDesign a layered bedroom lighting scheme: ambient, task (reading/vanity), and accent.Bedroom Lighting CalculatorDesign a complete layered lighting scheme for any bedroom. Get ambient, bedside, wardrobe, and accent recommendations with a scaled floor plan, dimmer circuits, and…Can Light Spacing CalculatorCan light spacing — space can lights apart by half the ceiling height. For an 8-foot ceiling, place lights 4 feet apart and 2 feet from the walls.Ceiling Fan Light CalculatorFind the right LED upgrade for your ceiling fan — compatibility check, dimmer warnings, smart-home conflict detection, and a personalised replacement spec.Ceiling Fixture SizeFind the ideal flush-mount ceiling fixture diameter for any room based on its length and width.Ceiling Fixture Size CalculatorFind the right ceiling fixture diameter, fixture type, and drop length for any room and ceiling height.Chandelier Size CalculatorGet the right chandelier diameter, hang height, and fixture size for any room — dining room, foyer, bedroom, or kitchen island.Circadian Lighting CalculatorCalculate melanopic equivalent daylight illuminance (mEDI) for any lighting scenario and check WELL Building Standard L07 circadian compliance.Cove Lighting CalculatorPlan cove lighting for a room — LED strip lumen output, mounting position, and spacing for a smooth, even ceiling wash.Hallway Lighting CalculatorLighting Layout & Planning Hallway Lighting Calculator Determine fixture count, spacing, and lumen requirements for corridors and hallways. Choose a Home Theater Bias Lighting CalculatorD65 calibration, display-type intelligence, TV geometry visualisation, and brightness ratio guidance. The enthusiast-grade bias lighting tool.How Bright Should Kitchen Lights Be?Kitchen lights need 300–500 lux for general ambient light and 500–800 lux at the worktop for food prep.How Many Lumens for a Garage?Aim for 50 lumens per square foot for general use, or 100 lumens per square foot for a workshop.How Many Recessed Lights Do I Need?How many recessed lights do you need? The answer depends on your room size, ceiling height, and fixture output — but most rooms follow a simple spacing rule that…Kitchen Lighting CalculatorDesign a complete layered kitchen lighting plan — ambient recessed, task under-cabinet, island pendants, and accent.Living Room Lighting CalculatorDesign a complete layered lighting scheme for any living room. Place furniture on the floor plan, choose your mood and fixtures, and get zone-by-zone lux targets…Pendant Light Height CalculatorCalculate the correct hang height for any pendant — kitchen island, dining table, or hallway. Live elevation preview, spacing layout, and expert sizing guidance.Picture Light Placement CalculatorFind the ideal position and angle for picture lights, track fixtures, or recessed Recessed lighting layout calculatorCalculate fixture count, spacing, beam spread, and coverage for any room. Choose your layout strategy, fixture size, and beam angle — then see the optimised floor…Room Lumens CalculatorTotal lumens needed to light a room to a target illuminance.Stair Lighting CalculatorCalculate the right lighting for a staircase — step illumination, fixture spacing, and placement for safe, even coverage.Under-cabinet lighting calculatorDesign a complete under-cabinet lighting system for any kitchen. Place cabinets on the floor plan, choose strip type and mounting position, and get lux at counter…Vanity Light Size CalculatorFind the right vanity light width, mounting height, and lumen output for any bathroom.What Size Chandelier for a Dining Room?Add the room's length and width in feet — the total in inches is the right chandelier diameter. A 12×14 ft dining room needs roughly a 26-inch chandelier.

🏢 Commercial, Industrial & Emergency 23

Car Showroom Lighting CalculatorDesign automotive showroom lighting that makes vehicles look stunning. Calculate ambient, accent, and feature lighting for every zone — from the showroom floor to…Classroom LightingSize lighting for K–12 and higher-education classrooms to IESNA RP-3 recommended levels.Cleanroom Lighting CalculatorCalculate cleanroom lighting to ISO 14644-1 standards. Specify luminaire requirements for any ISO class — from ISO 8 controlled environments to ISO 3 ultra-clean…Cold Storage Lighting CalculatorAccount for temperature derating when sizing lighting for refrigerated warehouses, freezers, and cold Corridor LightingDesign lighting for hallways, corridors, and egress paths — fixture count, spacing, and required light levels.Data Centre Lighting CalculatorCalculate lighting for data centres and server rooms to ASHRAE, IES RP-24, and Uptime Institute Tier standards.Emergency Egress Lighting CalculatorCalculate emergency egress lighting to BS 5266-1, EN 1838, and NFPA 101 Life Safety Code.Emergency LightingCalculate emergency fixture spacing, battery runtime, and code compliance for means-of-egress lighting.Emergency Lighting Compliance CalculatorCheck if your emergency lighting meets NFPA 101 and IBC requirements for egress illumination. Calculates minimum foot-candle levels and battery backup compliance.Exit Sign CoverageCalculate exit-sign spacing and maximum viewing distance to meet egress code coverage for any space.Explosion Proof Lighting CalculatorDetermine the correct hazardous location fixture rating (NEC Class/Division/Group) for industrial environments with High Bay SpacingCalculate optimal fixture spacing for high bay warehouse and industrial lighting. Adjust inputs Hospital and Medical Lighting CalculatorCalculate lighting for any healthcare zone to HTM 08-03, EN 12464-1, and ASHRAE/IES healthcare standards.Hospital LightingCalculate lighting for healthcare spaces to IESNA RP-29 — patient rooms, corridors, exam, and surgical areas.Hotel Lobby Lighting CalculatorDesign hotel lobby lighting that creates an unforgettable first impression. Calculate layered lighting for every zone — from the arrival drop-off to the reception…Low Bay LightingSize LED low-bay fixtures for 12–25 ft ceilings — fixture count, spacing, and lumen output.Office Lighting Design CalculatorDesign compliant office lighting to EN 12464-1 and ASHRAE 90.1 standards. Calculate fixture count, spacing, LPD, and uniformity for any office zone — from open plan…Parking Lot Lighting CalculatorDesign a compliant parking lot lighting system. Calculate pole count, spacing, fixture wattage, and energy costs — with IES RP-20 compliance check for your security…Restaurant Lighting CalculatorDesign restaurant lighting that enhances the dining experience and makes food look irresistible.Retail Lighting CalculatorDesign a complete retail lighting scheme with ambient, accent, and feature layers.School and Classroom Lighting CalculatorDesign school and educational lighting to EN 12464-1 and BB93 standards. Calculate fixtures for any room type, verify uniformity and glare compliance, and plan…Warehouse Foot-Candle CalculatorHow many foot-candles does a warehouse need? Calculate the required illuminance, fixture count, and Warehouse Lighting CalculatorPlan warehouse lighting to IES RP-2 standards. Calculate high bay or low bay fixture count, bay-by-bay layout, aisle illuminance, and energy cost — for any…

⚡ LED, Drivers & Electrical 21

💰 Energy, Cost & Lifetime 21

🎥 Photography, Film & Video 15

Cinematic Lighting PlannerPlan a complete cinematic lighting setup for any camera, lens, and scene. Calculates required lux for correct exposure, designs key/fill/back/hair/background light…CRI and TLCI Calculator for Photography and VideoAffiliate link - we may earn a small commission at no cost to you Exposure & Lux CalculatorConvert between EV (Exposure Value), lux, foot-candles, and camera Exposure Value (EV) CalculatorCalculate Exposure Value (EV) from your camera settings — then instantly see every equivalent exposure combination.Green Screen Lighting CalculatorCalculate green screen (chroma key) lighting requirements for film and video production.Hyperfocal Distance CalculatorCalculate hyperfocal distance for any lens and aperture combination. Focus at the hyperfocal distance and everything from half that distance to infinity will be…LED Video Panel Comparison CalculatorCompare two LED video panels side by side across every key metric — output, efficiency, colour quality, and cost per lux.Lighting Gel Calculator — Colour Correction FiltersFind the right colour correction gel to match or shift your light source. Enter your source and target colour temperatures — or pick a common scenario — to get the…Lighting Ratio Calculator for Portrait PhotographyCalculate the exact fill light setting needed to achieve any lighting ratio — from flat editorial to dramatic fashion.Softbox Coverage and Light Quality CalculatorCalculate the light quality, shadow softness, and coverage area for any softbox or modifier.Softbox Coverage CalculatorCalculate the illuminated coverage area, soft light spread angle, and subject-to-source Studio Flash Power CalculatorCalculate the flash power needed to achieve your target aperture, or find what aperture a given strobe produces at any distance.Studio Lighting RatioCalculate key-to-fill lighting ratios for photography and film, with the resulting contrast shown in stops.Video Lighting CalculatorCalculate the exact illuminance your scene needs for correct video exposure — then get a complete three-point lighting plan with wattage per fixture.White Balance Calculator for Photography and VideoFind the correct white balance setting for your lights, calculate a mixed-source average, and see how scene appearance changes at different camera WB settings.

🌳 Outdoor & Landscape 15

Flood Light Coverage CalculatorCalculate how many flood lights you need to illuminate any outdoor area to your required light level.Highway Lighting CalculatorLighting Layout & Planning Hallway Lighting Calculator Determine fixture count, spacing, and lumen requirements for corridors and hallways. Choose a Landscape LightingPlan a low-voltage (12V) landscape lighting system — transformer size, fixture load, and wire voltage drop.Landscape Lighting CalculatorPlan your low-voltage landscape lighting system. Calculate voltage drop per wire run, transformer load, and wire gauge recommendations to ensure every fixture…Parking Area Pole SpacingCalculate the optimal light-pole placement grid for parking lots and large paved areas.Parking Area Pole Spacing CalculatorDesign the pole spacing layout for any parking area. Enter your car park dimensions and parking bay geometry, choose a pole configuration, and get a full layout…Path Light Spacing CalculatorCalculate the optimal spacing between path lights for any walkway, garden path, or driveway.Pole HeightDetermine the right pole height for outdoor area lighting based on the coverage and spacing you need.Pole Height CalculatorCalculate the optimal pole height for outdoor area lighting — or find the illuminance achieved at a known pole height and spacing.Roadway and Street Lighting CalculatorEN 13201, IES RP-8, and AS/NZS 1158 compliant street lighting design and energy analysis.Security LightingDesign perimeter and area security lighting to IES RP-33 — fixture count, spacing, and illuminance levels.Security Lighting CalculatorDesign security lighting for any protected zone — perimeter fence lines, entrance gates, parking areas, and building facades.Sport hall lighting calculatorDesign sports hall lighting to EN 12193 and IES RP-6 standards. Calculate fixtures for any sport and competition level — from recreational community use to TV…Sports LightingCalculate fixture count and lumen requirements for sports facilities. Select a sport, set your String Lights CalculatorCalculate how many string light strands you need for any space — patio, pergola, backyard, event tent, or wedding venue.

🌱 Horticulture & Grow Lights 10

COB vs Quantum Board LED Grow Light CalculatorCompare COB LED and quantum board LED grow lights side by side. Enter your specific fixtures or use the type defaults to see efficiency, heat output, coverage, and…DLI CalculatorCalculate Daily Light Integral (DLI) from your grow light's PPFD and photoperiod, or find what PPFD and hours you need to hit a target DLI for any crop.Greenhouse Lighting CalculatorCalculate supplemental lighting requirements for greenhouse growing. See month-by-month natural vs supplemental DLI and total fixture wattage needed to hit your…Grow Light Heat Output CalculatorCalculate how much heat your grow lights produce and what cooling capacity you need to maintain optimal grow room temperature.Grow Light Yield EstimatorEstimate indoor grow yield based on your light intensity, grow area, medium, and grow conditions.Grow Tent Sizing CalculatorFind the right LED wattage, plant count, and light placement for your grow tent. Select a preset size or enter your own dimensions.Lux to PPFD ConverterConvert lux readings to PPFD (µmol/m²/s) for grow light planning, or convert PPFD to lux.Plant Stage Light Hours CalculatorFind the optimal light hours and DLI for every stage of your plant's life cycle. Enter your PPFD to get exact photoperiod recommendations and electricity costs per…PPFD grow light calculatorEstimate PPFD and DLI for your grow light setup — in umol/m2/s and mol/m2/day.VPD Calculator for Grow RoomsCalculate VPD (Vapor Pressure Deficit) and see how it interacts with your light intensity.

🎛 Stage, Controls & DMX 7

DMX Address CalculatorCalculate DMX start addresses for every fixture in your rig. Add fixtures, set their channel count and quantity, and instantly get a complete patch list with…Fixture Configuration Builder1Family 2Size 3Optic 4Lumens 5CCT 6CRI 7Driver 8Finish 1 Fixture family Recessed downlightCeiling recessed can Surface mountCeiling disk / drum Gobo Projection CalculatorCalculate the projected gobo size at any throw distance, or find what throw distance you need for a target projection size.Lighting Control Zone CalculatorPlan lighting control zones and check compliance with ASHRAE 90.1-2019 automatic control requirements.Moving Head Pan Tilt CalculatorCalculate the exact pan and tilt angles to point a moving head fixture at any position on stage.Stage Wash Coverage CalculatorCoverage area, overlap, and fixture count for stage wash lighting rigs Stage Dimensions Stage width (m)Throw Distance CalculatorCalculate throw distance from a spotlight, accent light, or stage fixture to achieve a target illuminance.