Work out the square footage (or square metres) of a room or area from length and width, across multiple rooms.
This square footage calculator works out the floor area of one or more rooms in square feet and square metres, and adds an optional waste allowance for flooring, tiling or carpet. It's ideal for ordering materials or comparing room sizes – works in metric or imperial and copes with several identical rooms at once.
| Material / layout | Waste |
|---|---|
| Straight-lay laminate / vinyl | 5–10% |
| Tiles (straight) | 10% |
| Diagonal or herringbone | 15–20% |
Two bedrooms each 4 m × 3.5 m = 14 m² each = 28 m² total (about 301 sq ft). Add 10% waste = ~30.8 m² to order.
Multiply the length by the width of the area. For example, a room 12 ft by 10 ft is 120 square feet.
A 5–10% waste allowance is common to cover cuts, breakages and pattern matching. Add more for diagonal layouts or complex rooms.
Divide the room into rectangles, calculate each area, then add them. Use the quantity field for several identical areas.
Add 5–10% to your square footage for cuts, breakages and pattern matching. Increase this to around 15% for diagonal layouts or rooms with many angles.
Divide square feet by 10.764. The calculator shows both units at once so you do not need to convert manually.
