Rectangular Tank Volume Calculator (gal, ft³)

Calculate the volume of a rectangular tank or box in gallons and cubic feet.

Rectangular Tank Volume Calculator (Imperial)
Rectangular Tank Volume

IBC tote, tank, pool

Tank Dimensions
ft
in
ft
in
ft
in
Common tank sizes
Water Level
ft
in
1' 7 11/16"
Results
Water Volume
0 US gal
Total Capacity
0 US gal
Filled
0 %
From Bottom
0 in
To Top
0 in
Water Weight
0 lb
Remaining
0 US gal
Water Volume
0 yd³
Total Capacity
0 yd³

How to Calculate Rectangular Tank Volume in Imperial Units

Determine the volume of a rectangular container in gallons and cubic feet. Enter length, width, and height in inches or feet.

Example: a tank 5 ft long, 3 ft wide, and 2.5 ft tall holds 280 gallons (37.5 ft³). A 24×12×16 inch aquarium holds about 20 gallons.

Supports partial fill calculations — enter the current water level to see how much liquid is in the tank.

Misha Noyr, M.Eng.

Misha Noyr, M.Eng.

Civil Engineer · 15+ yrs · structural design, geotechnics. Full bio ↓