Thermal Expansion Calculator

Inputs

Material

Coefficient of linear thermal expansion in µm/(m·°C).

Original length (L₀)

Starting length before the temperature change.

Temperature change (ΔT)

Temperature change in °C or K. Use a negative value for cooling.

°C

Default result

Length change(ΔL)

0.6mm

Pass

growth from heating

Also computed

Final length(L)1.0006m

Thermal strain(ε)0.0006

Coefficient used(α)12µm/m·°C

Method notes 3 notes

Linear thermal expansion: ΔL = α · L₀ · ΔT. Alpha is in µm/(m·°C), equivalent to ppm/°C.
A °C temperature change has the same magnitude as a kelvin change. For °F, convert the temperature difference to °C first: Δ°C = Δ°F × 5/9.
The coefficients are typical room-temperature values; actual alloy, temperature range and heat treatment can shift alpha.