Calculating your rolls of sod needed is straightforward once you know the Sod formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Sod Calculator.
What is Sod?
The Sod calculation tells you your rolls of sod needed from a few simple inputs. The figure you are solving for here is the rolls of sod needed.
The Sod formula
This calculation combines several inputs through a multi-step method rather than a single one-line formula. Enter the values below and the calculator resolves each step in order. The inputs it needs are:
- Lawn length — a value measured in m. Example: 10 m.
- Lawn width — a value measured in m. Example: 5 m.
- Area per roll — a value measured in m². Example: 0.93 m².
- Wastage allowance — a percentage, such as an annual rate. Example: 5%.
How to calculate it step by step
- Write down the lawn length (for example, 10 m).
- Write down the lawn width (for example, 5 m).
- Write down the area per roll (for example, 0.93 m²).
- Write down the wastage allowance (for example, 5%).
- Apply the formula above to get your rolls of sod needed.
- Double-check the result with the Sod Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Lawn length | 10 m |
| Lawn width | 5 m |
| Area per roll | 0.93 m² |
| Wastage allowance | 5% |
| Rolls of sod needed | 57 |
| Total area to cover | 50.00 |
With lawn length of 10 m, lawn width of 5 m, area per roll of 0.93 m² and wastage allowance of 5%, the rolls of sod needed works out to 57.
Example 2
With lawn length of 20 m, lawn width of 5 m, area per roll of 0.93 m² and wastage allowance of 5%, the rolls of sod needed works out to 113.
| Result | Value |
|---|---|
| Rolls of sod needed | 113 |
| Total area to cover | 100.00 |
Example 3
With lawn length of 5 m, lawn width of 5 m, area per roll of 0.93 m² and wastage allowance of 5%, the rolls of sod needed works out to 29.
| Result | Value |
|---|---|
| Rolls of sod needed | 29 |
| Total area to cover | 25.00 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Sod Calculator does it instantly, for free, with the formula and a worked example built in.
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