Turf calculator: rolls for any lawn shape
The calculator needs JavaScript. The worked example, formula and figures below show exactly how it works, so you can do the sum yourself. A guide, not advice. Check your supplier's or maker's figures before ordering.
Short answer
Worked example
| You enter | Value |
|---|---|
| Lawn area | rectangle 6 m × 5 m |
| m² per roll | 1 m² |
| Waste allowance | 5% |
| Topsoil density | 1.4 t/m³ |
| Topsoil waste allowance | 10% |
Order: 32 rolls of turf
| Result | Value |
|---|---|
| Turf rolls | 32 |
| Lawn area | 30 m² |
Show the working
- Lawn area: 30 m²
- Rolls: 30 × 1.05 (5% waste) ÷ 1 m² per roll = 31.5, rounded up = 32
How it works
- Rolls = lawn area × (1 + waste) ÷ m² per roll, rounded up
- Topsoil (t) = area × depth × topsoil density × (1 + topsoil waste)
- Fertiliser (kg) = area × grams per m² ÷ 1,000
Lay turf the day it arrives; order for delivery when the ground is ready.
Our default (adjustable)
These are typical planning figures and our own allowances, not facts about your product. Change any of them in the calculator to match your bag, pack or tin.
| Figure | Our default (adjustable) | Kind | Source |
|---|---|---|---|
| m² per roll | Enter from the bag, pack or tin | Common UK size Not yet checked against the source | From your product brief v2 L3: roll size from the supplier (null). |
| Waste allowance | 5 % | Our assumption Not yet checked against the source | Our choice: change it to suit your job brief v2 L3 TU1 (5%). Researcher to check against a turf supplier's guide. |
| Topsoil density | 1.4 t/m3 Sources range 1.4–1.5 t/m3 | Typical value Not yet checked against the source | rospower.co.uk tonnage calculator (exact page to confirm) (checked 19 October 2026) |
| Topsoil waste allowance | 10 % | Our assumption Not yet checked against the source | Our choice: change it to suit your job Allowance for settlement. |