Heat Transfer Coefficient Calculator

Your details

Select what you want to find. The inputs below update to match the chosen mode.
Heat flux: heat transferred per unit area per unit time.
W/m²
Temperature difference between the surface and the bulk fluid.
K
Result
100

Primary calculated value for the selected mode

UnitW/(m²·K)
Thermal resistance (R)0.01
Resistance unitm²·K/W
Heat flux (q)5,000
Heat flux unitW/m²
100 W/(m²·K)
Free convection (gas)<25Forced convection (gas)25-250Free convection (liquid)250-1000Forced convection (liquid)1000-10000Phase change10000+

The convective heat transfer coefficient is 100.00 W/(m²·K).

  • This falls in the free or low-velocity forced convection range for gases.
  • Adding turbulence promoters, fins, or higher flow velocities can boost h into the forced-convection range.
  • Thermal resistance is 1.000e-2 m²·K/W per unit area.

Next stepPair this with the thermal resistance breakdown in the steps panel to see which resistance dominates and where design changes will have the most impact.

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