About

Aquarium hobbyists and pool contractors rely on precise volume calculations to manage water chemistry and structural load. A miscalculation in volume can lead to incorrect chemical dosing, potentially harming aquatic life or compromising sanitation. This tool bridges the gap between linear measurements and liquid capacity. It handles the conversion of dry dimensions into fluid volume, accounting for the geometric differences between rectangular tanks and cylindrical reservoirs. The focus is on providing a verifiable capacity metric for filtration sizing and heater selection.

Formulas

For rectangular containers, the volume is derived from the product of length, width, and height, scaled by 1000 if converting from cubic meters:

V_L = (l × w × h)_m × 1000

For cylindrical tanks, the area of the base is multiplied by height:

V_L = π × r² × h × 1000

Reference Data

Tank Shape	Typical Dimensions	Liters (L)	Gallons (US)
Nano Cube	30cm × 30cm × 30cm	27 L	7.1 gal
Standard 10 Gal	50cm × 25cm × 30cm	37.8 L	10 gal
Standard 20 Gal (Long)	76cm × 30cm × 30cm	75.7 L	20 gal
Standard 55 Gal	122cm × 33cm × 53cm	208 L	55 gal
Standard 75 Gal	122cm × 46cm × 53cm	284 L	75 gal
Standard 120 Gal	122cm × 61cm × 61cm	454 L	120 gal
Oil Drum (Cylinder)	Dia: 58cm, H: 88cm	208 L	55 gal
IBC Tote	100cm × 120cm × 100cm	1000 L	264 gal
Garden Pond (Small)	1.5m × 1.0m × 0.5m	750 L	198 gal
Olympic Pool	50m × 25m × 2m	2,500,000 L	660,430 gal
Bucket	Dia: 30cm, H: 35cm	24.7 L	6.5 gal
Bathtub	1.5m × 0.7m × 0.4m	420 L	111 gal

Frequently Asked Questions

No. The calculator assumes internal dimensions. For aquarium safety, always measure the inside of the tank or subtract the glass thickness (usually 6mm to 12mm) from your external measurements to get the true water volume.

There are two types of gallons: US Gallons and UK (Imperial) Gallons. 1 US Gallon is approx 3.785 Liters, while 1 UK Gallon is approx 4.546 Liters. This tool outputs US Gallons by default but clearly labels them to avoid confusion.

Yes. Instead of inputting the total height of the tank, simply input the depth of the water level. The Length and Width (or Diameter) remain the same.

The tool accepts Diameter or Radius. Mathematically, Radius is simply Diameter divided by 2. Our cylinder mode allows you to input Diameter directly for convenience.