Calculate Energy in Warm Water

Calculator for the energy that cold water needs to get warm or that warm water can give to its cooler surroundings. This applies to the temperature range in which water is liquid. The thermal energy can be calculated using the specific heat capacity from the temperature difference between warm water and cold surroundings and the amount of water. In practice, more energy is required for heating, since the efficiency cannot be 100 percent.
Please enter two of the three free values, the third value will be calculated. Water is often given in liters. If you don't need an exact result, you can equate liters with kilograms for the sake of simplicity. The formula is e=c*m*ΔT

Spec. heat capacity c:		J / (kg * K)
Temperature difference ΔT:		°C, K°F
Mass M:		gkgt
Energy e:		JkJMJGJWHkWHcalkcal

Round to   0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15   decimal places.

Example: heating 2 liters of water from 20°C to 80°C, i.e. a temperature difference of 60°C, requires an energy of almost 140 watt hours. This energy is released back into the environment as the water cools. In such a process, a very high level of efficiency can be achieved, so that the energy expenditure and the energy released are almost equal.

Of all solids and liquids, liquid water has the highest specific heat capacity. This means that more energy must be expended to heat a certain amount of water to a certain temperature than for all other solid or liquid objects of the same mass and temperature range. Accordingly, more energy can be stored in water and is released again when it cools down. The specific heat capacity of liquid water is more than twice as high as that of ice and almost ten times as high as that of iron. Only the gases hydrogen and helium have higher values; the value of helium is slightly higher, but the specific heat capacity of hydrogen is more than three times as high as that of liquid water.

Last updated on 06/30/2025. Author: Jürgen Kummer

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