Heat Capacity Calculator

Heat capacity describes how much energy is required to raise the temperature of a substance by a given amount. It is a fundamental concept in thermodynamics and has practical applications in cooking, engineering, climate science, and industrial processes.

The Specific Heat Capacity Formula

Q = m × c × ΔT

Where:

• Q = heat energy transferred (joules, J)
• m = mass of the substance (kg or grams depending on units)
• c = specific heat capacity (J/g·°C or J/kg·K)
• ΔT = change in temperature (°C or K, the change is the same in both)

Example: Heating Water

To raise 1 kg of water from 20°C to 100°C:

• m = 1 kg = 1,000 g
• c = 4.186 J/g·°C (water)
• ΔT = 100 − 20 = 80°C
• Q = 1,000 × 4.186 × 80 = 334,880 J = 334.9 kJ

Specific Heat Capacities of Common Materials

Why Water’s High Heat Capacity Matters

Water has an exceptionally high specific heat capacity (4.186 J/g·°C) compared to most other substances. This is why:

• Oceans moderate coastal climates, water absorbs and releases heat slowly
• Sweating cools the body efficiently, water evaporation removes large amounts of heat
• Cooking water takes more energy than heating the same mass of most other foods

Calories and Joules

1 calorie (cal) = 4.184 J (the heat needed to raise 1 g of water by 1°C) 1 food Calorie (kcal) = 4,184 J = 1,000 cal