Latent heat at 212°F calculator

The 970 Btu/lb approximation applies to the stated 212°F condition.

Units

Q_{\text{latent}} = m \times h_{\text{fg}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

Q_{\text{latent}} = 260 \times 970 = 252{,}200

Symbol	Meaning	Unit
$Q_{\text{latent}}$	latent energy transferred	Btu
$m$	mass condensed or evaporated	lb
$h_{\text{fg}}$	vapor-minus-liquid enthalpy at the stated condition	Btu/lb

Symbol	Meaning	Unit
$Q_{\text{latent}}$	latent energy transferred	kJ
$m$	mass condensed or evaporated	kg
$h_{\text{fg}}$	vapor-minus-liquid enthalpy at the stated condition	kJ/kg

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.