Tools for Builders & DIY
Quick, no-fuss material estimators for common jobs. Prefer inches/feet or different units? Use the Unit Converter.
Tools in this category
Guide: measure, convert, then add waste
For materials, accuracy comes from consistent units and a sensible waste allowance. Convert units before calculating and round up when buying packaged items (tile boxes, wallpaper rolls).
Read the builders & DIY guideHow to estimate materials (the reliable method)
- Measure twice: confirm length/width/height and note units.
- Convert once: put everything into one unit system (e.g., metres + square metres).
- Calculate base quantity: area ÷ coverage, or length × width × depth, etc.
- Add waste: cuts, off-cuts, and breakage are normal. Round up to packaged quantities.
Common mistakes to avoid
The most common DIY error is mixing millimetres and metres (or inches and feet). Convert first, then calculate.
Tiles, boards, and wallpaper need cutting. A small waste allowance often prevents a second trip to the store.
Paint depends on coats and coverage. Concrete depends on depth. Include the “hidden” dimension.
For wallpaper and paint, doors/windows can materially change totals. Subtract them if you’re close to a roll/tin boundary.