The useful set
All calculators
Every tool reveals its assumptions and turns the result into a quantity you can actually purchase.
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The useful set
One project. One clear answer.
Every tool reveals its assumptions and turns the result into a quantity you can actually purchase.
Paint
Estimate interior wall area, paint gallons and one-gallon cans after subtracting doors and windows.
Use calculator →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 slab volume and how many concrete bags to buy, with editable 80-lb bag yield and waste.
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.