ONE FORMULA, ONE ANSWER
Surface Convection Calculator
Apply Newton's law of cooling to a surface with a known convection coefficient. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Heat transfer rate from surface to fluid Q̇
Enter values and select Calculate.
Q̇ = h A (T_s − T_∞)
Assumptions
Use h,A>0 and a known mean h. The tool does not infer h from velocity alone. A surface colder than the fluid gives a negative heat transfer rate.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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