Square Metre Calculator

Square metres of a room, garden or plot: rectangles, circles and triangles added together, with square feet, hectares, acres and cost per m².

Square metres (m², also spelt square meters) are length × width in metres. A 4 × 3 m room is 12 m². Measurements in centimetres or millimetres convert by dividing by 100 or 1,000, so 3 m 60 cm is 3.6 m. Spaces that aren't rectangles can be split into rectangles, circles and triangles and added together, and the total is shown in square metres, square feet, hectares and acres, with an optional cost per square metre.

Units
Area
m
m
Square metres
12

m²

Square feet
129.2

ft²

Hectares
0.0012

10,000 m² each

Acres
0.003

4,047 m² each

How it was worked out
  1. Area: 4 m × 3 m = 12 m²

Common use cases

  • The floor area of a room for flooring, carpet or tiles
  • The area of a house, flat or extension
  • Garden, lawn and plot areas
  • Price a job quoted per square metre

How to use

  1. Enter the length and width of each area in metres (use decimals for centimetres: 3.6 for 3 m 60 cm).
  2. Change a row to a circle or triangle for round and angled spaces, and add as many areas as you need.
  3. Read the square metres, square feet, hectares and acres.
  4. Enter a price per m² for a cost estimate.

FAQ

How do I calculate square metres?

Multiply length by width, both in metres. Split L-shaped rooms into rectangles and add them. For a circle, π × radius²; for a triangle, half the base times the height.

How do I convert m² to square feet?

Multiply by 10.764. To go from square feet to m², divide by 10.764 (or multiply by 0.0929).

How many square metres are in a hectare and an acre?

A hectare is 10,000 m² (100 × 100 m). An acre is about 4,047 m², or 0.405 hectares.

Related tools