Skip to main content
Calcimator

Aquarium Size Calculator

Calculate the minimum aquarium size for your fish. Get tank recommendations, filter GPH, and heater wattage based on fish count, size, and type.

Inputs

inches

Results

Minimum Gallons

20 gallons

Recommended25 gallons
Standard Tank29 gallon — 30×12×18 in
Filter Rating100 GPH
Heater125 watts

Minimum Gallons

20 gallons

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. Number of Fish — Number of fish in the tank. Accepts values from 1 to 100 (default: 10).
  3. Average Fish Size — Average fish size in inches. Accepts values from 0.5 inches to 24 inches (default: 2 inches).
  4. Fish Type — Type of fish. Choose from: Tropical (1 gal/inch), Goldfish (2 gal/inch), Cichlids (2 gal/inch), Marine (5 gal/inch). default: 0.
  5. Live Plants — enter your preferred option from the dropdown. Choose from: No, Yes. default: 0.
  6. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  7. Minimum Gallons — shown as a numeric value. This is the primary result of this calculator.
  8. Recommended — shown as a numeric value.
  9. Standard Tank — your calculated result.
  10. Filter Rating — shown as a numeric value.
  11. Heater — shown as a numeric value.
  12. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
Ad Placeholder

Related Calculators

Lifetime Pet Cost Calculator

Estimate the total lifetime cost of pet ownership including food, vet care, grooming, insurance, and supplies. Compare dogs and cats.

Dog Food Calculator

Calculate how much to feed your dog based on weight, age, and activity level. Includes daily calorie needs and monthly food costs.

Cat Food Calculator

Calculate how much to feed your cat daily based on weight, age, activity level, and food type.

Ad Placeholder