Floor Size Calculator
Enter the length and width of up to three areas and anything to take off, such as a fixed kitchen island. The calculator adds them up and gives the floor area in square metres and square feet.
- Floor area
- Square feet
- Each part
Leave an area at zero to skip it.
Floor area is length times width, area by area. Split an L-shaped room into rectangles. A 5 × 4 m room with a 3 × 2.5 m alcove is 20 + 7.5 = 27.5 m², which is about 296 sq ft. Take off anything fixed that will not be covered.
Floor area chart
Common room sizes. Search for a room.
| Room (m) | Area (m²) | Area (sq ft) |
|---|---|---|
| 2 × 2 | 4 | 43 |
| 3 × 2.5 | 7.5 | 81 |
| 3 × 3 | 9 | 97 |
| 4 × 3 | 12 | 129 |
| 4 × 4 | 16 | 172 |
| 5 × 4 | 20 | 215 |
| 6 × 4 | 24 | 258 |
| 6 × 5 | 30 | 323 |
| 8 × 6 | 48 | 517 |
Square metres and feet.
Room length and area
Room 4 m wide plus a 2.5 m square alcove. Slide the room length.
The plan shows each area with its size.
How to measure floor area
Room to total. Step through it.
Sketch
The room shape.
Measure at floor level, as walls are not always straight.
Square metres, square feet or square yards
Area units. Compare them.
Metric.
Imperial.
Carpet.
Carpet is still often sold by the square yard in the US.
Before you order
Floor checks. Tick each item.
Tick each item as you go.
Measure into door openings if the new floor runs through them.
What you get
Floor area. Each tile explains one result.
Total.
Converted.
Each area.
Fixed units.
Areas used.
Add about 10% when you order flooring, for cuts and waste.
Frequently Asked Questions
No question matches that search.
How do I work out floor area?
Multiply the length by the width. For odd shapes, split the floor into rectangles and add them.
How do I measure an L-shaped room?
Treat it as two rectangles, find the area of each and add them together.
How do I convert square metres to square feet?
Multiply by ten point seven six four.
Should I include the area under kitchen units?
Only if the new floor will go under them.
Do I measure into doorways?
Yes, if the floor runs through to the threshold.
How accurate do my measurements need to be?
To the nearest centimetre or half inch is plenty.
Is floor area the same as flooring to buy?
No. Add a waste allowance for cuts when buying flooring.
Know your floor
Measure each part, add them up and you have the number every flooring, heating and furniture plan starts from.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.