

March 10, 2026 · Iyman Faisal · Practical engineering guide

Calculating the volume & water capacity of a tank is important for any of construction, These calculations help us the design of the tank’s size and capacity, ensuring it meets the project requirement. in this accurate capacity calculation will helpful for water usage, load distribution, and the efficiency of water intake and outflow systems.
In this article we will provides the step by step procedure to find out the calculation of volume & Water capacity of Rectangular Tank
Formula to find capaity of Water capacity of Rectangular Tank = Length × Width × Height
For Example From the above image
Length (L) = 5.00 m
Width (W) = 3.00 m
Height (h) = 2.50 m
So, Volume = 5.00m × 3.00m × 2.50m = 37.50 m3
The density of water = 1 m³ = 1000 liters (1000 kg)
Weight of water = 37.50 m³ × 1000 = 37,500 liters
1 liter = 0.264172 US gallons
so, Water in US Gallons:
37,500 × 0.264172 = 9,906.45 US gallons
1 liter = 0.219969 UK gallons
Water in UK Gallons:
37,500 × 0.219969 = 8,248.84 UK gallons
So, This Tank Capacity is 37,500 liters / 9,906.45 US gallons / 8,248.84 UK gallons
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