31 · Calculators

Area Calculator

Pick a shape, enter its measurements and get the area — converted to square metres and square feet.

Area

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How to use the area calculator

  1. Choose a shape.
  2. Choose the unit you measured in.
  3. Enter the measurements shown for that shape.

Area formulas

  • Rectangle: length × width
  • Triangle: base × height ÷ 2
  • Circle: π × radius²
  • Trapezoid: (top + bottom) ÷ 2 × height
  • Parallelogram: base × height
  • Ellipse: π × semi-major × semi-minor axis

Measuring a room

For an L-shaped room, split it into rectangles, work out each one and add them together. Add 5–10% extra when buying flooring or tiles to allow for cuts.

Examples

Rectangle, 12 × 8 metres

96 m² · 1,033.34 ft²

Circle, radius 3 metres

28.2743 m²

Questions

How do I convert m² to ft²?

Multiply by about 10.764. The calculator shows both automatically.

What height do I use for a triangle?

The perpendicular height: the straight-line distance from the base to the opposite corner, at a right angle to the base.

Can I use any unit?

Yes. Choose “Any unit” and the result is in square units of whatever you entered.