This compost ratio reference table shows the browns needed for a range of greens (nitrogen) volume values, assuming a browns : greens ratio of 3. Every figure is computed with the same engine that powers our Compost Ratio Calculator, so the numbers are exact.
| Greens (nitrogen) volume | Browns needed | Total compost volume |
|---|---|---|
| 2.5 litres | 7.5 | 10.0 |
| 5 litres | 15.0 | 20.0 |
| 7.5 litres | 22.5 | 30.0 |
| 10 litres | 30.0 | 40.0 |
| 15 litres | 45.0 | 60.0 |
| 20 litres | 60.0 | 80.0 |
| 30 litres | 90.0 | 120.0 |
| 50 litres | 150.0 | 200.0 |
| 70 litres | 210.0 | 280.0 |
| 100 litres | 300.0 | 400.0 |
How to use this table
Find the row closest to your greens (nitrogen) volume and read across to the browns needed. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Compost Ratio Calculator for a precise answer.
Need a value that is not in the table? — the Compost Ratio Calculator does it instantly, for free, with the formula and a worked example built in.
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