Calculate soil organic matter, organic carbon, organic matter pounds, organic matter tons, soil carbon stock, organic matter change, and amendment needs. Use this organic matter calculator for soil tests, crop fields, gardens, compost planning, soil health tracking, and carbon estimates.
Organic matter stock:
The calculator estimates soil mass from area, depth, and bulk density, then multiplies by organic matter percentage.
Organic carbon:
Organic matter is converted to organic carbon using the organic matter to carbon factor.
Organic matter change:
Starting and ending organic matter percentages are compared to estimate change over time.
Amendment needed:
The calculator estimates how much compost or amendment may be needed to reach a target organic matter increase.
An organic matter calculator helps estimate soil organic matter stock, carbon stock, and amendment needs from soil test data.
It can help compare current organic matter, target organic matter, soil depth, bulk density, soil carbon, organic matter gain, amendment tons, and project cost.
Your result shows estimated soil mass, organic matter pounds, organic matter tons, organic carbon pounds, organic carbon tons, target organic matter gap, amendment tons needed, cost, organic matter change, and annual change rate. These are estimates based on the values you enter.
Estimate soil mass from area, depth, and bulk density, then multiply soil mass by the organic matter percentage as a decimal.
A common estimate divides organic matter by 1.72 to estimate organic carbon, though actual values can vary by soil and lab method.
Bulk density converts soil volume into soil mass. Organic matter percentage is based on soil mass, so bulk density affects total pounds or tons of organic matter.
Not all added compost, manure, or residue becomes stable soil organic matter. Some decomposes, mineralizes, or is lost, so efficiency lowers the expected retained amount.