Thermal Expansion Calculator
SI
Imp
Imperial
Inputs
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Material
Coefficient of linear thermal expansion in µm/(m·°C).
Carbon steel (12)
304 stainless (17.3)
Aluminum 6061 (23.6)
Brass (19)
Copper (16.6)
Ti-6Al-4V (8.6)
Invar 36 (1.2)
Custom coefficient
Original length
(L₀)
Starting length before the temperature change.
m
Temperature change
(ΔT)
Temperature change in °C or K. Use a negative value for cooling.
°C
Custom alpha
(α)
Linear thermal expansion coefficient.
µm/m·°C
Results
Default result
Edit inputs
Length change
(ΔL)
0.6
mm
Pass
growth from heating
Also computed
Final length
(L)
1.0006
m
Thermal strain
(ε)
0.0006
Coefficient used
(α)
12
µm/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.
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