Aquarium Fish

Aquarium Calculator - Calculate Fish Tank Volume

Quick Links:
  1. Rectangular Tank Size
  2. Cylinder Tank Size
  3. Hexagon Tank Size
  4. Heater Size
  5. Chiller Size
  6. Fahrenheit to Celsius
  7. Gallons to Liters
  8. Inches to Centimeters
  9. UK Gallons to US Gallons
  10. Meters to Feet
  11. Convert Meq/L to dKH CaCO3 (ppm)

Calculate Rectangle Fish Tank Volume in Gallons

rectangular aquarium calculator
Fish Tank Length in Inches:
Fish Tank Width in Inches:
Fish Tank Height in Inches:
Aquarium volume is:
US Gallons
UK Gallons

Next: Get Fish Stocking Suggestions for aquariums this size.

Calculate Cylinder Aquarium Volume

cylinder aquarium calculator
Fish Tank Height (h) in Inches:
Fish Tank Radius (r) in Inches:
Aquarium volume is:
US Gallons
UK Gallons

Calculate Hexagon Aquarium Volume

hexagon aquarium calculator
Fish Tank Height in Inches:
Length of One Side in Inches:
Aquarium volume is:
US Gallons
UK Gallons

Heater Size Calculator
Enter Tank Gallons:

Enter Temperature Change Required (tank temperature minus room temperature):

Heater(s) size needed:

*Always unplug heaters before working on your aquarium! Please note that these heater size recommendations are approximations. Tank wall thickness and whether or not you use a lid or top on your aquarium could affect the heater size needed.

Chiller Size Calculator
Enter Tank Volume In Gallons:

Enter Temperature Drop Needed:

Chiller size needed in HP (horsepower):

*The formula used for calculating chiller size is: volume in gallons * 8.34 weight of 1 gallon of water * temperature pull down needed * 20% padding factor. It's better to use an oversized chiller (hence the 20% padding factor in the calculation) than an undersized one to ensure it lasts longer and doesn't have to work as hard and other factors that could impact the efficiency of the unit such as ambient room temperature.

Convert Fahrenheit to Celsius
Enter °F:
= °C
Convert Celsius to Fahrenheit
Enter °C:
= °F

Convert Gallons to Liters
Enter Gallons:
= Liters
Convert Liters to Gallons
Enter Liters:
= Gallons

Convert Inches to Centimeters
Enter Inches:
= Centimeters
Convert Centimeters to Inches
Enter Centimeters:
= Inches

Convert UK Gallons to US Gallons
Enter UK Gallons:
= US Gallons
Convert US Gallons to UK Gallons
Enter US Gallons:
= UK Gallons

Convert Meters to Feet
Enter Meters:
= Feet
Convert Feet to Meters
Enter Feet:
= Meters

Convert Meq/L to dKH CaCO3 (ppm)
Enter Meq/L:
= dKH and
CaCO3 (ppm)
Convert dKH to Meq/L and CaCO3 (ppm)
Enter dKH:
= Meq/L and
ppm CaCO3
Convert CaCO3 (ppm) to Meq/L and dKH
Enter CaCO3:
= Meq/L and

Next: Read about Saltwater Aquarium Supplements.

Site References :
Wikipedia - for some of the formulas used.

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