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"Compost" is a calculator utility designed to help household composters achieve an optimal mix. A well functioning compost decomposes at a good rate and does not smell bad. To achieve the proper environment, experts recommend a Carbon:Nitrogen ratio somewhere around 25 to 30 parts carbon to 1 part nitrogen.

Users input the pounds or kg of compostable items they have on hand, choosing from categories of carbon-rich and nitrogen-rich components. "Compost" then calculates the amounts of other items needed to balance the mixture.