Aquarium Calculator

This calculator determines your aquarium's water volume and recommends the appropriate number of fish based on the one-inch-per-gallon rule, adjusted for fish size.

1. 1

   Step 1

   Enter your tank's length, width, and height in centimeters

2. 2

   Step 2

   Select the average size of fish you plan to keep

3. 3

   Step 3

   Click Calculate to see volume in liters and gallons

4. 4

   Step 4

   Review recommended fish capacity and equipment sizing

• 1

  Always understock rather than overstock your aquarium

• 2

  Consider fish adult size, not purchase size when calculating

• 3

  Factor in decorations and substrate that reduce water volume

• 4

  Different fish species have varying space requirements

• 5

  Larger tanks are more stable and easier to maintain

• Calculating based on juvenile fish size instead of adult size

• Not accounting for decorations reducing actual water volume

• Overstocking the tank leading to poor water quality

• Ignoring species-specific space requirements