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Fish Feed Requirement Calculator

Work out fish feed requirement instantly with clear inputs, formula shown and shareable results.

About Fish Feed Requirement Calculator

Daily ration is a percentage of standing biomass — 5-8% for fry, 2-3% for grow-out and 1-1.5% for large fish. Total feed over the period divided by the feed conversion ratio gives the weight gain, so a good FCR of 1.5 means one and a half kilograms of feed per kilogram of fish produced.

Formulas

Feed requirement

Feed per day = biomass x feeding rate %; total = per day x days

Growth

Weight gain = total feed / FCR

Worked example

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

Inputs used

Standing Fish Biomassminimum 0 kg
500 kg
Feeding Rateaccepts 0.1–15 % body weight/day
3 % body weight/day
Feeding Periodminimum 1 days
30 days
Feed Conversion Ratiominimum 0.1
1.6

Results

Feed Required
450.00
Feed Per Day
15.00
Expected Weight Gain
281.25
Biomass At End Of Period
781.25

Step by step

  1. 1Values used
  2. 2Feed requirement
  3. 3Growth
  4. 4Feed Required= 450.00
  5. 5Feed Per Day= 15.00
  6. 6Expected Weight Gain= 281.25
  7. 7Biomass At End Of Period= 781.25

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 or tax into account.
  • Figures are rounded for display to 2 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 does the feeding rate fall as fish grow?

Metabolic rate per unit body weight declines with size. Feeding a large fish at fry rates wastes feed and pollutes the pond.

Should the ration be recalculated during the cycle?

Yes — recalculate after each sampling, because biomass rises steadily. Feeding a fixed daily quantity underfeeds late in the cycle and slows growth.

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