Welcome to the WSU-Puyallup compost mixture calculator

The calculator estimates compost mixture C:N ratio and moisture content, based on the analysis of your feed stocks and the mixture proportions that you choose. You can use the calulator to evaluate the effects of different feedstock mixtures on C:N ratio and moisture content of the initial pile. You can also use the calculator to check if the materials you have on hand will make a suitable mix for composting, or if you need to find different materials, or change proportions.

This calculator relies on the AgWeatherNet system to manage data storage needs. If you don't have a free AgWeatherNet login, click here to register and then to get started.

Washington State University