Water Weight Calculator

Select the water weight unit and enter the volume. The calculator will instantly estimate the water weight in grams, ounces, kilograms, and pounds.

Convert from:

Volume:

Water Weight:

Related

Calculate the weight of water for any given volume with this free online Water Weight Calculator. It simplifies water weight calculations for personal, scientific, or industrial use.

How the Water Weight Calculator Works

This tool determines the mass of water contained within a specified volume. Here's how it works:

Input:

Select the unit of water for which you want to calculate weight.
Enter the volume and the temperature in the designated fields.
Click Calculate to get the result.

Output:

Weight of water within the given volume
Conversions in grams, ounces, pounds, and kilograms

You can also calculate the molar mass of water using our free online tool.

How to Calculate Water Weight

The basic formula is:

Mass = Density × Volume

Example #1:

How much does 1 liter of water weigh at 10°C?

Density of water at 10°C = 0.99975 g/cm³

Mass = 0.99975 × 1 = 0.99975 kg

Example #2:

How much does 275 US gallons of water weigh?

1 US gallon ≈ 2.21 lbs

275 × 2.21 = 607.75 lbs ≈ 275 kg

Effect of Temperature on Water Weight

Water density changes with temperature:

Hot water is less dense → weighs slightly less
Cold water is denser → weighs slightly more
Ice is less dense → floats on water

The calculator automatically adjusts for temperature, providing accurate results for grams, ounces, pounds, or kilograms.

💧 Fun Fact 💧

1 liter of water weighs exactly 1 kilogram because the density of water is 1 g/cm³. This means 1 milliliter weighs 1 gram!

Water Density at Different Temperatures

Temperature (°F / °C)	Density (g/cm³)
32 / 0	0.99987
39.2 / 4.0	1.00000
40 / 4.4	0.99999
50 / 10	0.99975
60 / 15.6	0.99907
70 / 21	0.99802
80 / 26.7	0.99669
90 / 32.2	0.99510
100 / 37.8	0.99318
120 / 48.9	0.98870
140 / 60	0.98338
160 / 71.1	0.97729
180 / 82.2	0.97056
200 / 93.3	0.96333
212 / 100	0.95865