Heat Transfer Calculator

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Calculates the rate of heat transfer due to conduction, convection, or radiation.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Thermal Conductivity (k) - Conduction (W/m·K), Area (A) - Conduction (m²), Temperature Difference (ΔT) - Conduction (°C), Thickness (x) - Conduction (m), Convection Heat Transfer Coefficient (h) (W/m²·K), Area (A) - Convection (m²), Temperature Difference (ΔT) - Convection (°C), Emissivity (ε) - Radiation, Area (A) - Radiation (m²), Temperature 1 (T₁) - Radiation (°C), and Temperature 2 (T₂) - Radiation (°C) in the units shown.

Step 2

Read Temperature 2 (T₂) - Kelvin, Temperature 1 (T₁) - Kelvin, Stefan-Boltzmann Constant (σ), Heat Transfer Rate - Convection (Q), Heat Transfer Rate - Conduction (Q), and Heat Transfer Rate - Radiation (Q) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Conduction - Example 1

Thermal Conductivity (k) - Conduction (W/m·K): 0.026 W/m·K; Area (A) - Conduction (m²): 1 m²; Temperature Difference (ΔT) - Conduction (°C): 10 °C; Thickness (x) - Conduction (m): 0.01 m; Convection Heat Transfer Coefficient (h) (W/m²·K): 10 W/m²·K; Area (A) - Convection (m²): 1 m²; Temperature Difference (ΔT) - Convection (°C): 20 °C; Emissivity (ε) - Radiation: 0.9; Area (A) - Radiation (m²): 1 m²; Temperature 1 (T₁) - Radiation (°C): 100 °C; Temperature 2 (T₂) - Radiation (°C): 20 °C

Temperature 2 (T₂) - Kelvin: 293.15 K; Temperature 1 (T₁) - Kelvin: 373.15 K; Stefan-Boltzmann Constant (σ): 0.0000000567 W/m²·K⁴; Heat Transfer Rate - Convection (Q): 200 W; Heat Transfer Rate - Conduction (Q): 26 W; Heat Transfer Rate - Radiation (Q): 612.5069587 W

Convection - Example 1

Thermal Conductivity (k) - Conduction (W/m·K): 0.026 W/m·K; Area (A) - Conduction (m²): 1 m²; Temperature Difference (ΔT) - Conduction (°C): 10 °C; Thickness (x) - Conduction (m): 0.01 m; Convection Heat Transfer Coefficient (h) (W/m²·K): 25 W/m²·K; Area (A) - Convection (m²): 2 m²; Temperature Difference (ΔT) - Convection (°C): 15 °C; Emissivity (ε) - Radiation: 0.9; Area (A) - Radiation (m²): 1 m²; Temperature 1 (T₁) - Radiation (°C): 100 °C; Temperature 2 (T₂) - Radiation (°C): 20 °C

Temperature 2 (T₂) - Kelvin: 293.15 K; Temperature 1 (T₁) - Kelvin: 373.15 K; Stefan-Boltzmann Constant (σ): 0.0000000567 W/m²·K⁴; Heat Transfer Rate - Convection (Q): 750 W; Heat Transfer Rate - Conduction (Q): 26 W; Heat Transfer Rate - Radiation (Q): 612.5069587 W

Radiation - Example 1

Thermal Conductivity (k) - Conduction (W/m·K): 0.026 W/m·K; Area (A) - Conduction (m²): 1 m²; Temperature Difference (ΔT) - Conduction (°C): 10 °C; Thickness (x) - Conduction (m): 0.01 m; Convection Heat Transfer Coefficient (h) (W/m²·K): 10 W/m²·K; Area (A) - Convection (m²): 1 m²; Temperature Difference (ΔT) - Convection (°C): 20 °C; Emissivity (ε) - Radiation: 0.9; Area (A) - Radiation (m²): 2 m²; Temperature 1 (T₁) - Radiation (°C): 100 °C; Temperature 2 (T₂) - Radiation (°C): 20 °C

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