Thermal Conductivity Calculator
Calculate the rate of heat transfer through a material using Fourier's law: Q = k · A · ΔT / d.
Inputs
Fourier's Law of Heat Conduction
Q = k · A · ΔT / d
Q = heat transfer rate (W)
k = thermal conductivity W/(m·K)
A = area (m²)
ΔT = temperature difference (K)
d = thickness (m)
Results
Heat Transfer Rate
watts (W)
Heat Flux (q)
W/m²
Thermal Resistance (R)
K/W
R-value (per unit area)
m²·K/W
U-value
W/(m²·K)
Fill in the inputs and click Calculate to see results.
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Summary
Calculate the rate of heat transfer through a material using Fourier's law: Q = k · A · ΔT / d.
How it works
- User inputs thermal conductivity k, area A, temperature difference ΔT, and thickness d.
- The calculator applies Fourier's law: Q = k · A · ΔT / d.
- Heat flux (W/m²) is derived as q = k · ΔT / d.
- Thermal resistance R = d / (k · A) is also displayed for reference.
- All results update instantly on every input change.
Use cases
- Estimate heat loss through a wall, window, or insulation panel.
- Compare insulating performance of different building materials.
- Size heating or cooling systems based on conductive heat load.
- Verify thermal resistance (R-value) calculations in construction.
- Analyze heat dissipation through metal heat sinks in electronics.
- Solve physics and engineering homework problems on heat conduction.
Frequently Asked Questions
Last updated: 2026-06-11 ·
Reviewed by Nham Vu