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Convection Heat Transfer Calculator — Newton Cooling Law
Calculate convection heat rate and heat flux from h, area, surface temperature and fluid temperature.
Last updated: September 17, 2026
Results
Use non-negative h and positive area
Formula, example and assumptions
Q=hA(Ts−T∞); qʺ=h(Ts−T∞).
h=25 W/m²K over 4 m² with a 30 K difference transfers 3 kW.
- h is supplied by the user or a suitable correlation.
- Steady uniform surface and bulk-fluid temperatures are assumed.
Frequently asked questions
What does the Convection Heat Transfer Calculator calculate?
Calculate convection heat rate and heat flux from h, area, surface temperature and fluid temperature.
Which units should I use?
The input labels show the required SI units. Keep properties and geometry consistent before using the result in another engineering calculation.
Can I use this result for design?
Use it for transparent engineering estimates and checks. Validate property data, geometry, correlations and applicable codes for safety-critical design.