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Lawn Calculators

Lawn Area Calculator

Lawn area for irregular gardens, with the seed, fertiliser and mowing time it implies.

Enter values

Results update as you type.

Result

Lawn area

102 m²

In square feet
1,097.9
In acres
0.0252
Grass seed at 35 g/m²
3.57 kg
Fertiliser at 35 g/m²
3.57 kg
Mowing time at 400 m²/hour
0.26 hours
Water for 25 mm
2,550 litres

About the Lawn Area Calculator

Almost no lawn is a neat rectangle. Break yours into rectangles, triangles and circles, add them up, and you have the area every other garden calculation depends on — seed, fertiliser, sod and how long mowing will take.

Also known as: garden area calculator, grass area, how big is my lawn, turf area calculator.

How to use this calculator

  1. Enter rectangle length, rectangle width, triangle base, triangle height and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

area = Σ shapes − beds and paths

Worked example

Using the values pre-filled in the calculator above:

  • Rectangle length = 12 m
  • Rectangle width = 8 m
  • Triangle base = 6 m
  • Triangle height = 4 m
  • Circle diameter = 0 m
  • Beds and paths to deduct = 6 m²

the calculator returns:

  • Lawn area: 102 m²
  • In square feet: 1,097.9
  • In acres: 0.0252
  • Grass seed at 35 g/m²: 3.57 kg