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Fish Feed Quantity Calculator

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

About Fish Feed Quantity Calculator

Daily feed is a percentage of the standing biomass, split across feedings; expected growth divides the total feed by a feed conversion ratio of 1.5. Feeding by biomass percentage keeps rations right as fish grow, and overfeeding is the main driver of ammonia spikes in a closed system.

Formulas

Daily ration

grams per day = biomass in grams x feed rate percentage

Growth estimate

growth kg = total feed kg / feed conversion ratio

Worked example

With the default values below, Fish Feed Quantity Calculator returns Feed per day of 100.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total fish biomassminimum 0.01 kg
5 kg
Feed rate as % of biomass per dayaccepts 0.1–10 %
2 %
Feedings per dayminimum 1
2
Period to plan forminimum 1 days
30 days

Results

Feed per day
100.0 g
Feed per feeding
50.00 g
Feed for the period
3.000 kg
Expected growth at a 1.5 conversion ratio
2.000 kg

Step by step

  1. 1Values used
  2. 2Daily ration
  3. 3Growth estimate
  4. 4Feed per day= 100.0 g
  5. 5Feed per feeding= 50.00 g
  6. 6Feed for the period= 3.000 kg
  7. 7Expected growth at a 1.5 conversion ratio= 2.000 kg

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 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

How is the Fish Feed Quantity figure worked out?

grams per day = biomass in grams x feed rate percentage. Daily feed is a percentage of the standing biomass, split across feedings; expected growth divides the total feed by a feed conversion ratio of 1.5.

Why does this matter?

Feeding by biomass percentage keeps rations right as fish grow, and overfeeding is the main driver of ammonia spikes in a closed system.

What do I need to enter?

Enter total fish biomass, feed rate as % of biomass per day, feedings per day, period to plan for. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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