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Physics

Steady Heat Conduction Calculator

Estimate heat flow across a uniform flat slab.

SI units shown beside each fieldIdeal model explained below

Physical quantities

Runs on your device

CALCULATED QUANTITY

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter thermal conductivity, area, temperature difference, thickness.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Heat-transfer rate = conductivity × area × temperature difference/thickness.

A WORKED EXAMPLE

Using thermal conductivity = 0.04 W/(m·K), area = 0.5 m², temperature difference = 20 K, thickness = 0.1 m, the result is 4 W. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

One-dimensional steady state; ignores contact resistance and thermal bridges. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.

Common questions

Which inputs does this calculation need?

Estimate heat flow across a uniform flat slab. Enter thermal conductivity in W/(m·K), area in m², temperature difference in K, thickness in m. The filled example is editable and is not a saved personal record.

How should I interpret the result?

One-dimensional steady state; ignores contact resistance and thermal bridges. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.

Methodology maintained by ClarityKit. How these tools are built and checked.