Latent Heat Calculator
The heat of melting and boiling, where temperature stands still.
Heat with no temperature change
Q = m × L
During melting or boiling, added heat goes into breaking bonds, not raising temperature: ice water stays at 0°C until the last crystal is gone. Boiling a kilogram of water takes 2,260 kJ, nearly seven times the energy that heated it from 20 to 100. That hidden payload is why steam burns so badly and why sweating cools so well. For plain heating and cooling, use the specific heat calculator.