Calculate square footage or square metres for any room shape — rectangles, circles, triangles, and L-shapes. Add multiple rooms for a combined total. Free, instant, browser-based.
Always measure the longest and widest points of each room, including any alcoves or recesses. For irregular rooms, break the space into rectangles, measure each separately, and add them together — the L-shape mode does this automatically.
Add 10% to your total for rectangular rooms and 15% for rooms with cuts or diagonal patterns. For tiles, add 15% as standard. Wastage from cuts is the most common reason people run short mid-job.
The UK has mostly moved to square metres for flooring and property, but square footage is still common in real estate listings. 1 square metre = 10.764 square feet. This calculator shows both so you can match whichever unit your supplier uses.
A standard 2.5L tin of emulsion covers roughly 35 square metres (one coat). For walls, calculate the perimeter of the room multiplied by the ceiling height, then subtract doors and windows (roughly 2m² each). Most rooms need two coats.
Underfloor heating is typically priced per square metre. You only need to heat the usable floor area — subtract furniture footprints such as fitted wardrobes and kitchen units, which are usually around 30% of a room's total area.
An L-shape is two rectangles joined together. Measure the overall length and width of each 'arm' of the L separately, calculate each area, and add them. The L-shape option here asks for the outer dimensions and the rectangle to subtract.
Calculate the square footage or square metreage of any room or space. Add multiple rooms and shapes — rectangles, circles, triangles, and L-shapes — and get a total area instantly. Useful for flooring, tiling, paint, underfloor heating, and property listings.
Bedroom: 4m × 3.5m
14 m² (150.7 sq ft)
Circular patio: 5m diameter
19.6 m² (211.1 sq ft)
Living room: 6m × 5m + kitchen 4m × 3m
42 m² combined
Common area formulas
Add all room totals for the overall square footage
The square foot has been used in the English-speaking world since the 13th century. In the UK, the property market informally uses both square feet and square metres — estate agents often quote both to appeal to different generations. The average UK home is around 95 m² (1,022 sq ft), which is among the smallest in Western Europe.
For a rectangular room, multiply the length by the width. For example, a room 15 ft × 12 ft = 180 sq ft. For irregularly shaped rooms, break the space into rectangles, calculate each, and add the results.
Divide square feet by 10.764 to get square metres. Or multiply square metres by 10.764 to get square feet. For example, 200 sq ft = 18.58 m².
Calculate the room's square footage or square metreage, then add 10% for wastage on straightforward rectangular rooms, or 15% for rooms with angles, cuts, or patterned tiles.
Yes — use the Add Room button to add as many rooms as you need. Each can have a different shape and dimensions. The total at the bottom sums all rooms together.
Measure the full outer length and width of the L-shape (the large enclosing rectangle), then measure the missing corner rectangle that needs to be subtracted. Enter the outer dimensions as length and width, and the cut-out as a third measurement.