🌡️ Mechanical Tool

Heat Transfer Calculator

Conduction, Convection and Radiation, calculate heat transfer rate, thermal resistance and more.

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Fourier's Law of Conduction

Thermal Conductivity (k)

W/m·K

Cross-section Area (A)

m²

Temperature Difference (ΔT)

°C / K

Thickness (L)

Material Preset

How the Heat Transfer Calculator Works

Heat transfer is fundamental in mechanical, chemical, and HVAC engineering. This calculator covers all three modes, conduction (Fourier's Law), convection (Newton's Law of Cooling), and radiation (Stefan-Boltzmann Law), giving engineers instant thermal analysis without complex spreadsheets.

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Conduction

Calculate heat flow through solid walls using material conductivity, area, and thickness.

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Convection

Determine convective heat transfer with heat transfer coefficient and surface-fluid temperature difference.

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Radiation

Compute radiative heat emission using emissivity and absolute surface temperature.

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SI Units

All outputs in Watts (W) with clear formula reference for each mode.