Compost Ratio Calculator

Calculate your compost pile's carbon-to-nitrogen ratio from the weights of greens and browns to achieve the ideal 25-30:1 C:N ratio for fast, hot decomposition.

Greens (Nitrogen-Rich)

Fresh grass clippings (lbs) Vegetable / fruit scraps (lbs) Coffee grounds (lbs) Fresh plant trimmings (lbs)

Browns (Carbon-Rich)

Dry leaves (lbs) Straw / hay (lbs) Cardboard / newspaper (lbs) Wood chips / sawdust (lbs)

Carbon : Nitrogen ratio

Ideal range: 25:1 to 30:1

Too wet / smelly (low C:N)Too slow (high C:N)

Optimal zone: 25–30