Latent Heat Calculator

Free Latent Heat Calculator solves Q = m · L for the heat, mass, or specific latent heat involved in melting, boiling, or condensation.

847.6K uses Updated · 2026-05-12 Runs locally · zero upload
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How to Use Latent Heat Calculator

  1. Pick what to solve for — Q, m, or L.
  2. Enter the other two.
  3. Read the answer — Returned in the chosen unit.

Formula & Theory - Latent Heat Calculator

Q = m · L

Rearrangements:
m = Q / L
L = Q / m
SymbolMeaning
QHeat absorbed or released (J)
mMass of substance (kg)
LSpecific latent heat (J/kg)

Assumptions and Limits

  • Complete phase change occurs at constant temperature.
  • L is a material constant at the listed phase-transition temperature.

Use Cases for Latent Heat Calculator

  • Ice/water problems — How much energy to melt or boil a given mass.
  • HVAC — Dehumidification heat loads.
  • Phase-change materials — Thermal-storage design.

The Latent Heat Calculator handles every variant of the Q = mL relation.

Frequently asked questions about Latent Heat Calculator

What is latent heat?

Heat exchanged during a phase change at constant temperature. The Latent Heat Calculator uses Q = m · L where L is the specific latent heat.

Difference between fusion and vaporisation?

Fusion is solid↔liquid (water 334 kJ/kg). Vaporisation is liquid↔gas (water 2257 kJ/kg).

Why doesn't temperature change?

Energy goes into breaking intermolecular bonds rather than raising kinetic energy.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.