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.
Tile layout planner
Plan straight tile rows, centered edge cuts, joints, boxes and cost.
Use calculator →Straight stair calculator
Calculate equal risers and treads from your total rise, run and chosen maximum riser.
Use calculator →Rebar quantity calculator
Estimate one rectangular grid of straight bars from your spacing, cover and stock length.
Use calculator →Deck board calculator
Estimate deck boards and joists for a rectangular deck.
Use calculator →Common rafter calculator
Calculate one sloping rafter from horizontal run, roof pitch and horizontal overhang.
Use calculator →Wall stud calculator
Estimate studs for one straight wall from its length and your chosen spacing, with extra studs, waste and cost.
Use calculator →Brick calculator
Estimate bricks for one wall face after subtracting openings, using editable brick dimensions, joints, waste and price.
Use calculator →Paint
Estimate interior wall area, paint volume and containers 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 bag yield, weight and waste.
Use calculator →Wallpaper
Estimate strips and rolls while accounting for wall height and pattern repeat.
Use calculator →Drywall
Estimate wall and ceiling area and full drywall sheets to buy.
Use calculator →Roofing
Estimate sloped roof area, roofing squares and full bundles to buy.
Use calculator →Insulation
Estimate net wall or ceiling area and full insulation packs to buy.
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.