Smart calculators for building, lighting, crafts, cooking, math, and more.
Fast, accurate calculators for real-world projects.
Fast & Accurate
Mobile Friendly
Trusted Formulas
Lighting CalculatorsLumens, lux, beam spread, spacing, and more.
DIY & Construction CalculatorsConcrete, decking, paint, tile, roofing, and more.
CNC CalculatorsFeeds & speeds, RPM, chip load, and more.
Yarn & Fabric CalculatorsYardage, blankets, quilts, knitting, and more.
Fabrication CalculatorsSteel & material weight, weld size, plate, and more.
Cooking CalculatorsConversions, scaling, baking, brining, and more.
Everyday & Math CalculatorsDates, age, tips, fuel cost, percentages, fractions, and more.
Engineering CalculatorsBeams, gears, torque, electronics, tolerances, and more.
Coffee & Beverage CalculatorsCold brew, pour over, ratios, batch brewing, and more.Explore by Category
Lighting Calculators
Design with confidence. Calculate lumens, footcandles, lux, beam spread, driver load and more.
- Lumens Calculator
- Footcandle Calculator
- Fixture Spacing Calculator
DIY & Construction
Plan and build with the right numbers. Concrete, decking, tile, paint, roofing and more.
- Concrete Calculator
- Deck Board Calculator
- Paint Calculator
CNC Calculators
Dial in your machines. Feeds & speeds, chip load, RPM, tool deflection and more.
- Feeds & Speeds Calculator
- RPM Calculator
- Chip Load Calculator
Yarn & Fabric
Perfect your projects. Yarn amounts, fabric yardage, quilts, knitting gauge and more.
- Fabric Yardage Calculator
- Blanket Yarn Calculator
- Quilt Size Calculator
Accurate Formulas
Professional-grade formulas you can trust for real-world applications.
Mobile Friendly
Works perfectly on phones, tablets, and desktops.
Save & Share
Save your results, share with your team, and come back anytime.
Free to Use
All calculators are free with no sign-up required.