How we worked it out
Updated as you change the numbers.
- Volume = 24 × 12 × 16 in = 4,608 cu in.
- Gallons = 4,608 ÷ 231 = 19.95 US gal = 75.5 L.
- Weight = 75.5 L × 0.997 kg/L = 75.3 kg (166 lb).
Method and assumptions
A US gallon is defined as 231 cubic inches, so the calculator finds the inside volume in cubic inches and divides by 231. One gallon is 3.785 liters.
Water weight uses 0.997 kg per liter for freshwater at aquarium temperature (about 8.3 lb per gallon) and 1.025 for saltwater.
Tips
- Measure inside the glass: thick glass on big tanks can take a gallon or more off the outside measurements.
- A full tank is very heavy. Put large tanks across floor joists, near a load-bearing wall, on a stand rated for them.
Questions
How many gallons is a 24 × 12 × 16 tank?
24 × 12 × 16 = 4,608 cu in ÷ 231 = 19.9 gallons, which is the standard “20 gallon high”. The water alone weighs about 166 lb.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.