Water Tank Volume Calculator – How to Calculate Tank Capacity in Litres, Gallons, and m³
If you want to know how to calculate water tank capacity, how to calculate water tank capacity in litres, how to measure water tank capacity, or how to check water tank capacity, this complete guide explains every method. It covers rectangular, circular, square, overhead, underground, fish tanks, rainwater tanks, and fire water tank capacity calculations.
All related queries such as how to calculate water tank liter capacity, how to calculate water tank capacity in gallons, how to calculate m³ water tank capacity, and how to calculate capacity of water tank are fully answered with formulas and examples.
Understanding Water Tank Capacity
Water tank capacity is the total volume of water a tank can store. This volume is usually expressed in:
- Litres
- Gallons
- Cubic meters (m³)
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- what is the capacity of water tank
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How to Calculate Water Tank Capacity (All Methods)
Tank capacity is calculated based on tank shape and dimensions. Each type has its own formula.
1. How to Calculate Rectangular Water Tank Capacity
Rectangular tanks are the easiest to calculate.
Formula
Capacity (Litres) = Length (m) × Width (m) × Height (m) × 1000
Example
A tank measuring 2 m × 1 m × 1 m:
Volume = 2 × 1 × 1 = 2 m³
Capacity = 2 × 1000 = 2000 litres
This section answers:
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2. How to Calculate Circular Water Tank Capacity
Cylindrical or circular tanks require radius measurements.
Formula
Volume (m³) = π × r² × h
Litres = Volume × 1000
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3. How to Calculate Square Water Tank Capacity
Square tanks are similar to rectangular tanks but have equal sides.
Formula
Litres = Side × Side × Height × 1000
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- how to calculate water capacity of square tank
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4. How to Calculate Water Tank Capacity in Litres
To convert cubic meters to litres:
Formula
Litres = m³ × 1000
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- how to calculate water tank capacity in litres
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5. How to Calculate Water Tank Capacity in Gallons
Formula
Gallons = Litres × 0.264172
This section covers:
- how to calculate water tank capacity in gallons
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6. How to Calculate Water Tank Capacity in Cubic Meters (m³)
Formula
m³ = Length × Width × Height
This answers:
- how to calculate water tank capacity in m3
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How to Measure and Check Water Tank Capacity
You can measure tank capacity manually using internal dimensions.
Steps
- Measure internal length, width, height.
- Convert all values to meters.
- Apply the relevant formula.
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How to Calculate Water in a Tank (Partial Capacity)
If the tank is only partly filled:
Formula
Water Volume = Tank Base Area × Water Depth
This answers:
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How to Calculate Fish Tank Water Capacity
Most fish tanks are rectangular.
Formula
Litres = Length × Width × Height × 1000
Gallons = Litres × 0.264172
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How to Calculate Fire Water Tank Capacity
Fire tanks are sized based on fire flow and duration.
Formula
Fire Tank Capacity = Fire Flow Rate × Required Duration
This section covers:
- how to calculate fire water tank capacity
- how to calculate water storage capacity of a tank
How to Calculate Overhead and Underground Water Tank Capacity
Use standard tank formulas for underground or overhead tanks.
This section answers:
- how to calculate overhead water tank capacity
- how to calculate underground water tank capacity
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How to Calculate the Size of a Water Tank
To size a water tank:
- Determine daily water usage
- Multiply by desired storage days
- Choose tank size based on total volume
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How to Calculate Rainwater Tank Capacity
Formula
Rainwater Volume = Roof Area × Rainfall × Runoff Coefficient
This answers:
- how to calculate rain water tank size
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How Much Is a 5000 Gallon Water Tank?
A 5000-gallon water tank holds approximately 18,927 litres.
This answers:
- how much is a 5000 gallon water tank
How to Calculate Weight of Water in a Tank
Formula
Weight (kg) = Litres × 1
Weight (kN) = Weight (kg) ÷ 100
This section covers:
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Conversion Table
| Unit | Conversion |
|---|---|
| 1 m³ | 1000 litres |
| 1 litre | 0.264 gallons |
| 1 gallon | 3.785 litres |
| 1 ft | 0.3048 m |
Frequently Asked Questions
How do you calculate the capacity of a water tank?
Measure internal dimensions and apply the appropriate shape formula.
How to calculate the water tank capacity?
Multiply base area by height and convert to litres or gallons.
How to calculate volume of water tank in litres?
Find m³ and multiply by 1000.
How to calculate capacity of water tank in litres?
Use length × width × height in meters and multiply by 1000.
How to calculate a water tank capacity?
Use formulas for rectangular, circular, or square tanks.
How can calculate water tank capacity in liters?
Convert tank volume in m³ to litres by multiplying by 1000.