Goldfish Per Gallon Calculator
Calculate how many goldfish can safely live in your aquarium tank. Get stocking recommendations based on tank size and goldfish type.
Tank Information
Different types have different space requirements
Stocking Results
Enter tank volume and click "Calculate Stocking" to see results
Goldfish Per Gallon Calculator
Goldfish may look small in pet stores, but they grow fast and need plenty of space. A Goldfish Per Gallon Calculator helps you determine how many goldfish your tank can safely support, based on tank size and fish type.
This tool removes the need for manual counting and reduces the risk of miscalculations.
On average, goldfish need about 10-20 gallons per fish depending on the variety. Fancy goldfish generally require less space than common varieties.
Calculation Formulas
Goldfish Stocking Guidelines
Volume Conversion
Gallons = Liters ÷ 3.785
Convert liters to US gallons for calculation
Fancy Goldfish
Fish Count = Gallons ÷ 10
Each fancy goldfish needs 10 gallons of space
Common/Comet Goldfish
1 Fish + (Gallons - 20) ÷ 10
20 gallons for first fish, +10 gallons for each additional
These formulas follow commonly accepted aquarium guidelines for healthy goldfish care.
Tank Stocking Examples
Recommended Stocking Levels
| Tank Size | Goldfish Type | Recommended Fish | Status |
|---|---|---|---|
| 10 gallons | Fancy | 1 | Safe |
| 20 gallons | Fancy | 2 | Safe |
| 20 gallons | Common | 1 | Safe |
| 30 gallons | Common | 2 | Safe |
| 40 gallons | Fancy | 4 | Safe |
| 15 gallons | Common | 0 | Too Small |
These examples show safe stocking levels. Always err on the side of fewer fish for better water quality.
Final Thoughts
Goldfish thrive when given enough space. A Goldfish Per Gallon Calculator makes tank planning easy and accurate. Enter your tank size, choose the goldfish type, and get instant results you can trust.