Paint calculator
Estimate rectangular-room wall area, paint litres, waste, whole containers, and optional container cost.
Uses room length, room width, wall height, coats, coverage in m2/L, opening area, waste percent, and container size.
Calculators
Metric Home Project Calculators
Five static, browser-only tools for common home project material estimates. Each calculator shows its formula, validation messages, assumptions, and optional cost multiplication from values you enter.
Flooring calculator
Estimate flooring area across one or more rectangular zones, then round waste-adjusted area up to whole boxes.
Uses labelled length x width zones, waste percent, box coverage in m2, and optional box cost.
Tile calculator
Estimate floor or wall tile area, individual tiles, whole boxes, and optional box cost.
Uses labelled rectangular areas, tile width and height in millimetres, waste percent, and tiles per box.
Concrete calculator
Estimate concrete volume for slabs, footings, or cylindrical post holes, with optional bag rounding.
Uses cubic-metre formulas for each selected shape, waste percent, and optional bag yield in m3.
Gravel, soil & mulch calculator
Estimate bulk material volume, tonnes from editable density, and optional litre-bag counts.
Uses labelled rectangular zones, depth in millimetres, waste percent, editable density, and optional bag capacity.
Related measuring guides
- How to Measure a Room for Paint
Measure a rectangular room for the paint calculator using wall length, width, height, openings, coats, coverage, waste, and container size.
- How to Calculate Flooring Waste
Measure rectangular flooring zones and apply waste before rounding up to whole flooring boxes.
- How to Measure for Floor and Wall Tiles
Measure rectangular floor or wall tile areas, convert tile size from millimetres, apply waste, and round to whole tiles and boxes.
- How to Estimate Concrete Volume
Estimate metric concrete volume for slabs, footings, and cylindrical post holes using the same formulas as the concrete calculator.
- How to Calculate Gravel, Soil, and Mulch
Measure rectangular bulk-material zones, convert depth from millimetres to metres, apply waste, and estimate tonnes or litre bags.