The secret to fast, odor-free compost is getting the carbon-to-nitrogen ratio right. Too much green material creates a slimy, smelly pile. Too much brown material and decomposition stalls for months.
Our compost recipe builder lets you add your available materials and see the C:N ratio update in real time. The ideal range is 25:1 to 30:1 — our tool shows you exactly where your mix falls and suggests adjustments.
This follows composting science guidelines from University of Illinois Extension.
Frequently Asked Questions
What is the ideal carbon to nitrogen ratio for compost?
The ideal C:N ratio is 25:1 to 30:1. This provides enough nitrogen for microbes to break down carbon-rich materials efficiently, producing finished compost in 2-3 months with regular turning.
What are examples of green and brown compost materials?
Greens (nitrogen-rich): grass clippings, food scraps, coffee grounds, fresh plant trimmings. Browns (carbon-rich): dry leaves, cardboard, straw, wood chips, shredded newspaper.
Why does my compost smell bad?
A foul smell usually means too much nitrogen (green material) or the pile is too wet and lacks oxygen. Add brown materials like dry leaves or cardboard, and turn the pile to increase airflow.