๐ฑ Gardening
Composting Ratio Calculator
Composting microbes work best with about 25 to 30 parts carbon for every part nitrogen. Kitchen scraps and grass clippings are nitrogen-rich greens while leaves, cardboard and wood chips are carbon-rich browns, so layering them is how you hit the target.
How it works
Greens volume
Carbon to nitrogen of the greens
Carbon to nitrogen of the browns
Target C:N for the pile
Pile width
Pile height
Browns volume needed
Browns to greens by volume
Pile volume
Expected finishing time
Frequently asked questions
How do I use the Composting Ratio Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.