Planning a renovation, checking an architect’s drawing or pricing a building job starts with good numbers. These free tools help you sketch a floor plan, read scaled drawings, convert construction units and estimate how much paint, tile and concrete you need, plus how to lay out a staircase. Every calculator works in metric or imperial units, shows the formula it uses and runs entirely in your browser. Results are estimates, so always measure on site and check local rules before you buy or build.
Floor Plan Sketcher
Draw rooms on a grid, see sizes and areas, export a PNG plan.
Open toolDrawing Scale Converter
Convert scaled drawing sizes to real sizes and find a scale.
Open toolArea Calculator
Add up room and floor areas in square metres and square feet.
Open toolConstruction Unit Converter
Convert length, area and volume, including feet-inches and guntha.
Open toolPaint Calculator
Estimate litres or gallons of paint for walls and ceilings.
Open toolTile Calculator
Work out tiles and boxes for a floor or wall, with grout and waste.
Open toolConcrete Calculator
Concrete volume, premix bags and cement, sand and aggregate.
Open toolStair Calculator
Risers, treads, run, stringer length and angle with code checks.
Open tool