Successful compost requires the right blend of moist “green” scraps and dry “brown” materials. Too wet, and the pile turns slimy and anaerobic. Too dry, and decomposition slows to a crawl. This calculator helps gauge moisture content so you can adjust your mix. It uses a weighted average formula shown in MathML:
Here g and b denote the weights of green and brown materials, while mg and mb are their respective moisture percentages. The result M tells you whether to sprinkle water or add dry leaves.
A target moisture of 50–60% keeps microbes thriving. If your calculated value falls outside this window, tweak your ratios or turn the pile to aerate. The table below provides rough guidelines.
| Moisture Level | Action |
|---|---|
| Below 40% | Add water or fresh greens |
| 40–60% | Ideal balance |
| Above 60% | Mix in dry browns |
Maintaining moisture promotes speedy decomposition and helps avoid odors. Combined with periodic turning, monitoring moisture ensures your compost breaks down efficiently into nutrient-rich humus.
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