MTMasterTool

Aquarium Stocking Calculator

Compare total adult fish length with a user-selected stocking heuristic.

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What this tool does

Compare total adult fish length with a user-selected stocking heuristic. Does not guarantee safe stocking. Large-bodied fish cannot be sized safely by length-per-gallon rules.

How to use the Aquarium Stocking Calculator

  1. Enter or select usable water volume in gal.
  2. Enter or select total adult fish length in in.
  3. Enter or select chosen adult length allowance (in per us gallon).
  4. Read the calculated result; change any measurement to compare alternatives.

Formula

length capacity=volume×chosen allowance; utilization=adult fish length/capacity×100
volume
Usable water volume (gal, before metric conversion)
length
Total adult fish length (in, before metric conversion)
rate
Chosen adult length allowance (in per US gallon)

Does not guarantee safe stocking. Large-bodied fish cannot be sized safely by length-per-gallon rules.

Worked example

For aquarium stocking calculator, the following measurements illustrate the exact method: Usable water volume: 30; Total adult fish length: 20; Chosen adult length allowance (in per US gallon): 0.5.

Inputs

  • Usable water volume30 gal
  • Total adult fish length20 in
  • Chosen adult length allowance (in per US gallon)0.5

Result

  • Heuristic capacity utilization (%)133.33
  • Entered length capacity15 in

Results explained

Heuristic capacity utilization (%)
Heuristic capacity utilization (%) from the formula above. Does not guarantee safe stocking. Large-bodied fish cannot be sized safely by length-per-gallon rules.
Entered length capacity
Entered length capacity from the formula above, expressed in in before metric conversion. Does not guarantee safe stocking. Large-bodied fish cannot be sized safely by length-per-gallon rules.

Frequently asked questions

length capacity=volume×chosen allowance; utilization=adult fish length/capacity×100

No. Individual animals differ. Consult your veterinarian before changing feeding or treatment, and seek immediate veterinary care for poisoning concerns.

Does not guarantee safe stocking. Large-bodied fish cannot be sized safely by length-per-gallon rules.

Use current measured weight, actual food or product label values, and the dates or water readings requested. Check units before entering any value.

Verify if the animal is ill, pregnant, growing unusually, or on a special diet. Aquarium chemistry changes should be measured gradually and checked against product instructions.