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Thermal Resistance Calculator — Conduction R & Heat Rate
Calculate plane-wall conduction thermal resistance and heat rate from thickness, conductivity, area and temperature difference.
Last updated: September 17, 2026
Results
Use positive conductivity/area and non-negative thickness
Formula, example and assumptions
R=L/(kA); Q=ΔT/R.
A 0.1 m wall, k=0.5 W/m·K and area 10 m² has R=0.02 K/W; at ΔT=20 K, Q=1 kW.
- One-dimensional steady conduction is assumed.
- Contact and convection resistances are excluded unless modeled separately.
Frequently asked questions
What does the Thermal Resistance Calculator calculate?
Calculate plane-wall conduction thermal resistance and heat rate from thickness, conductivity, area and temperature difference.
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.