Lawn area calculator
Measure your lawn to work out its area and how much seed, turf and topsoil to order.
Your estimate
Lawn area
1,000 ft²
- Grass seed
- 5 lb
- Turf to order
- 1,050 ft²
- Topsoil volume
- 12.3 yd³
Estimates for planning only — not a quote, survey or financial advice.
How this is calculated
Formula
- Rectangle = length × width · circle = π × (diameter ÷ 2)² · triangle = ½ × base × height
- Seed = area × seeding rate
- Turf = area × (1 + extra %)
- Topsoil = area × depth
Assumptions
- Seeding rates depend on the grass species and on whether you sow a new lawn or overseed; check the seed bag.
- For irregular lawns, split the area into simple shapes and add the results.
- Topsoil settles after spreading; suppliers often suggest ordering a little extra.