Aquarium Size Calculator
Calculate the volume of your aquarium in gallons and liters based on dimensions and shape. Also estimate water weight and recommended heater wattage.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Aquarium Size Calculator
- Select Shape: Choose Rectangular or Cylindrical from the dropdown. Fields update automatically.
- Choose Unit: Pick Inches (imperial) or Centimeters (metric) for your measurements.
- Enter Dimensions:
- For Rectangular: Fill in Length, Width, and Height.
- For Cylindrical: Fill in Diameter and Height.
- Calculate: Click the Calculate button.
- Read Results: You’ll see:
- Volume in US gallons and liters.
- Water weight in pounds and kilograms.
- Recommended heater wattage range (3–5 watts per gallon).
Tip: Use inches for US gallons, centimeters for liters. The formula converts automatically.
Previous Results
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Frequently Asked Questions
Measure the length, width, and height of your aquarium from the inside edges. For cylindrical tanks, measure the diameter and height.
A general rule is 3-5 watts per gallon of water. Our calculator provides a range based on your tank volume.
Currently, it supports rectangular and cylindrical shapes. For other shapes, consult a specialized calculator.