Paint
Estimate wall area, gallons and one-gallon cans for a rectangular room.
Open full calculator →English
Free project calculators
Buy the right amount.
Skip the second trip.
Clear material estimates for real home projects — with the formula, waste allowance and purchase quantity shown before you shop.
- No account
- Project inputs stay on your device
- Clear purchase quantities
Calculator 01
Interior paint calculator
Estimate wall paint for a rectangular room. Doors and windows are subtracted.
The useful set
One project. One clear answer.
Every tool reveals its assumptions and turns the result into a quantity you can actually purchase.
Tile
Estimate floor area, tiles, boxes, waste allowance and purchase cost.
Use calculator →Flooring
Turn room dimensions and box coverage into the number of boxes to buy.
Use calculator →Concrete
Estimate cubic feet, cubic yards and concrete bags for a rectangular slab.
Use calculator →Wallpaper
Estimate strips and rolls while accounting for wall height and pattern repeat.
Use calculator →Our standard
Useful enough to bookmark.
01
Math in daylight
The formula and assumptions sit beside every result.
02
Built for the store
We round to cans, boxes, bags and rolls — not abstract decimals.
03
Honest limits
We flag variables a simple calculator cannot know for you.