Square Footage Calculator

Work out the square footage (or square metres) of a room or area from length and width, across multiple rooms.

ft
ft
%

How to Use This Calculator

How to Use

  1. Choose metric or imperial units.
  2. Enter the length and width of the room or area.
  3. Set how many identical rooms/areas you have.
  4. Add an optional waste percentage for flooring or tiling cuts.

Tips

  • For flooring and tiling, a 10% waste allowance is typical.
  • 1 square metre ≈ 10.764 square feet.
  • For L-shaped rooms, split them into rectangles and add the results.

Common Questions

How do I calculate square footage?

Multiply the length by the width of the area. For example, a room 12 ft by 10 ft is 120 square feet.

How much waste should I add for flooring?

A 5–10% waste allowance is common to cover cuts, breakages and pattern matching. Add more for diagonal layouts or complex rooms.

How do I measure an irregular room?

Divide the room into rectangles, calculate each area, then add them. Use the quantity field for several identical areas.

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