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Vermicompost Yield Calculator

Work out vermicompost yield instantly with clear inputs, formula shown and shareable results.

About Vermicompost Yield Calculator

Vermicomposting converts 40-50% of feedstock mass into vermicompost, the rest lost as carbon dioxide and moisture. Worms consume roughly their own body weight in feed each day, so worm biomass required is the daily feed rate. Worm biomass typically doubles every 60-90 days under good conditions.

Formulas

Vermicompost yield

Yield = feedstock x conversion efficiency

Worm requirement

Worm biomass = daily feed rate x stocking rate

Worked example

With the default values below, Vermicompost Yield Calculator returns Vermicompost Yield of 450.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Feedstock Chargedminimum 0 kg
1,000 kg
Conversion To Vermicompostaccepts 0–100 %
45 %
Worm Stocking Rateminimum 0 kg worms per kg feed per day
1 kg worms per kg feed per day
Cycle Durationminimum 0 days
60 days

Results

Vermicompost Yield
450.00
Worm Biomass Required
16.667
Daily Feed Rate
16.667
Worm Biomass Gain
8.333

Step by step

  1. 1Values used
  2. 2Vermicompost yield
  3. 3Worm requirement
  4. 4Vermicompost Yield= 450.00
  5. 5Worm Biomass Required= 16.667
  6. 6Daily Feed Rate= 16.667
  7. 7Worm Biomass Gain= 8.333

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why must feedstock be pre-composted?

Fresh material heats up and generates ammonia, both of which kill worms. Two to three weeks of thermophilic pre-composting stabilises it and destroys pathogens before the worms are introduced.

What conditions do worms need?

Moisture 70-80%, temperature 15-25 C, pH 6.5-7.5 and good aeration. Outside those ranges feeding slows sharply or the population dies.

Related Calculators

Vermicompost Yield Calculator – Calculate Vermicompost Yield