Compost Ratio Calculator (Browns and Greens)
Mix the right amount of dry “brown” and fresh “green” material for compost that breaks down well and does not smell.
Result
Enter the numbers above to see the result.
Results are estimates to help you plan. Always follow product labels and local advice.
Good compost needs a balance of carbon-rich “browns” (dry leaves, cardboard, sawdust) and nitrogen-rich “greens” (kitchen scraps, grass clippings, fresh weeds). A common starting point is about 3 parts browns to 1 part greens by volume.
Tips
- If the pile smells bad or is slimy, add more browns and turn it.
- If it is dry and slow, add greens and some water until it feels like a wrung-out sponge.
- Chop material into small pieces to speed things up, and keep meat, dairy and oily food out of a home pile.
Frequently asked questions
What is the best ratio of browns to greens?
A common rule of thumb is about 2 to 3 parts browns to 1 part greens by volume. Adjust by smell and moisture: too wet and smelly needs more browns, too dry and slow needs more greens.
What counts as brown and what counts as green?
Browns are dry leaves, shredded cardboard, paper, straw and sawdust. Greens are vegetable and fruit scraps, coffee grounds, fresh grass clippings and plant trimmings.