Compost C:N Ratio Calculator
Compost C:N Ratio Calculator
Grass 15-20, food scraps 12-15.
Leaves 40-80, cardboard 350.
Use 30 for hot composting.
| Detail | Value |
|---|---|
| Greens (Nitrogen) Weight | 10 units |
| Greens C:N Ratio | 15:1 |
| Browns (Carbon) Weight | 10 units |
| Browns C:N Ratio | 60:1 |
| Combined C:N Ratio | 24.0:1 |
| Browns Needed for 30:1 | 20.0 units |
| Target Ratio | 25:1 - 30:1 (hot compost) |
C:N Ratio as Browns Increase
Summary
What the Numbers Mean
With the defaults (10 units greens @ 15:1, 10 units browns @ 60:1), the mix computes to 24.0:1 — in the workable range, just shy of the 25-30:1 hot-compost sweet spot. Reaching 30:1 would need 20 total units of browns (add 10 to the current pile).
The Formula
The combined ratio is total weight ÷ total nitrogen: (wG + wB) ÷ (wG/rG + wB/rB). Common values: vegetable scraps 12-15:1, grass 15-20:1, dry leaves 40-80:1, straw 75:1, cardboard 350:1, sawdust 500:1.
Frequently Asked Questions
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