ClarityKitFind a tool
Physics

Thermal Diffusivity Calculator

Calculate thermal diffusivity from conductivity, density and specific heat.

SI units shown beside each fieldIdeal model explained below
Physics lab
Physics lab

Use the units beside each input and review the model assumptions.

See the method

Define your system

Runs on your device

Your 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, density, specific heat.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Thermal diffusivity α = k/(ρ cp).

A WORKED EXAMPLE

Using thermal conductivity = 200 W/(m·K), density = 2700 kg/m³, specific heat = 900 J/(kg·K), the result is 0.0000823045267 m²/s. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Use properties at the relevant temperature and phase. Assumes homogeneous material with isotropic conductivity.

What to keep in mind

Use properties at the relevant temperature and phase. Assumes homogeneous material with isotropic conductivity. 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

How do I use this thermal diffusivity calculator?

Calculate thermal diffusivity from conductivity, density and specific heat. Enter thermal conductivity in W/(m·K), density in kg/m³, specific heat in J/(kg·K). The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Use properties at the relevant temperature and phase. Assumes homogeneous material with isotropic conductivity.

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