The software you'd pay for, free in your browser.
Free tools that run in your browser. No sign-up, no install, no subscription.
- Runs on your device
- No account
- No usage limits
Construction & DIY
Stairs, roofs, concrete, lumber and wiring, worked out with diagrams and code checks.
Stair Calculator
Risers, treads and a stringer layout diagram, checked against residential code.
Roof Pitch Calculator
Pitch, angle, rafter length and roofing squares for gable, hip and shed roofs.
Board Foot Calculator
Board feet and lumber cost for a whole list of boards.
Concrete Calculator
Cubic yards and bags for slabs, footings and round columns.
Square Footage Calculator
Add up rooms and shapes in feet and inches, with cost per square foot.
Gravel Calculator
Cubic yards, tons and bags of gravel, sand or soil for any area.
Mulch Calculator
Cubic yards and bags of mulch for beds of any size and depth.
Voltage Drop Calculator
Voltage drop for copper and aluminum wire, and the smallest size that stays under 3%.
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Coming next
New categories are on the way.
- Statistics & charts
- Woodworking & 3D printing
- Cross stitch & craft patterns
- PDF & images
- Audio & music