Calculate the convective heat transfer coefficient (h) from heat flux and temperature difference.
Measurement Data
W/m²
°C
°C
Resulting Coefficient
Enter flux and temperatures to calculate h
About this calculator
Quick Reference
hHeat Transfer Coefficient
qHeat Flux (Watts per square meter)
TsSurface Temperature
T∞Ambient Fluid Temperature
Overview
The heat transfer coefficient (h) is a proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ΔT).
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Pro Tips
Heat flux (q) is the rate of heat transfer per unit area (W/m²).
h is not a material property but depends on fluid properties, surface geometry, and flow conditions (velocity).
Typical values for air (free convection) are 5-25 W/m²·K, while for water it can be 1000s.
Ensure consistent units for temperature (Kelvin or Celsius are both fine since we use the difference).
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Fun Facts
"Newton's Law of Cooling is the basis for this calculation."
"The Nusselt number (Nu) is often used in fluid dynamics to determine the heat transfer coefficient."
"The highest heat transfer coefficients are achieved during phase changes, like boiling or condensation."
