Square Footage Calculator guide
Square Footage Calculator: Square Feet and Square Metres
Use our square footage calculator to work out an area in square feet and square metres from feet or metres, and estimate the cost.
By the AllCalculator editorial teamUpdated 16 October 20261 min read
Square footage is still widely used in the UK for house sizes, flooring and office space. Our Square Footage Calculator gives you the area in square feet and square metres.
How to use the calculator (Square Footage Calculator)
- Choose feet or metres.
- Enter the length and width.
- If you have several identical areas, enter how many.
- Optionally, enter a price per square foot.
How it works
Area = length × width
| From | To | Multiply by |
|---|---|---|
| Square feet | Square metres | 0.0929 |
| Square metres | Square feet | 10.764 |
| Square yards | Square feet | 9 |
| Acres | Square feet | 43,560 |
A worked example
With the calculator's default settings, a room 15ft by 12ft is 180 sq ft, or 16.72m².
Odd-shaped rooms
Split the room into rectangles, work out each area and add them together. For an L-shaped room, that's two rectangles.
Frequently asked questions
How is house size measured in the UK?
Usually as the gross internal area, measured to the inside of the outside walls, in both square feet and square metres.
How much flooring should I buy?
Add 10% for cuts and waste. For tiles, use our Tile Calculator.
How big is the average UK home?
Around 90 to 95m², or roughly 1,000 sq ft.
For areas in square metres across several rooms, try our Square Meter Calculator.
Sources and further reading
Links open official and independent websites in a new tab.
This guide is general information to help you understand your options. It isn't financial, tax, legal or building advice and doesn't take your personal circumstances into account. Figures were checked when the guide was last updated and can change, so confirm anything important with GOV.UK, HMRC, a regulated adviser or a qualified tradesperson.