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Thermodynamics Calculators

Latent Heat Calculator

Energy to melt or boil a substance (Q = mL) with common latent heat values for water.

Also known as latent heat of fusion, latent heat of vaporization, melting energy.

Enter values

Results update as you type.

Result

Energy required

668,000 J

Kilojoules
668
Kilowatt-hours
0.18556
Time at 2 kW
5.57 min

About the Latent Heat Calculator

Energy to melt or boil a substance (Q = mL) with common latent heat values for water.

Also known as: latent heat of fusion, latent heat of vaporization, melting energy, boiling energy.

How to use this calculator

  1. Enter mass, phase change.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Latent Heat formula

Q = m × L

Worked example

Using the values pre-filled in the calculator above:

  • Mass = 2 kg
  • Phase change: Melting ice (334 kJ/kg)

the calculator returns:

  • Energy required: 668,000 J
  • Kilojoules: 668
  • Kilowatt-hours: 0.18556
  • Time at 2 kW: 5.57 min