How Much Does a Cubic Meter of Water Weigh?

A cubic meter of water weighs about

1.000 kg (1 tonne)

How to Calculate the Weight of a Cubic Meter of Water

Knowing the density of water (about 1,000 kg/m³ at 4°C, the point of maximum density), calculating the weight of a given volume of water is a direct operation: simply multiply the volume (in m³) by the density. For exactly one cubic meter, the result is therefore 1,000 kg, exactly one metric tonne.

The Conversion Formula

To calculate the weight (mass) of a volume of water, multiply the volume in cubic meters by the density:

To calculate the volume knowing the mass, perform the inverse operation, dividing by 1,000:

Practical Examples

• 0.5 m³ of water = 0.5 × 1,000 = 500 kg
• 1 m³ of water = 1,000 kg (1 tonne)
• 10 m³ of water (a small pool) = 10,000 kg (10 tonnes)
• 1 liter of water (0.001 m³) ≈ 1 kg

When This Calculation Is Needed

This calculation is useful in many practical contexts: sizing structures that need to support the weight of tanks, pools, or aquariums full of water; calculating the load of a boat or a tanker; or simply having a quick, intuitive reference for estimating liquid weights in everyday life.

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