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