ONE FORMULA, ONE ANSWER
Linear Thermal Expansion Calculator
Check free length change in a metal rod or an assembly clearance. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Free thermal length change ΔL
Enter values and select Calculate.
ΔL = α L₀ ΔT
Assumptions
Use L₀>0, small strain and a temperature range over which α is approximately constant. The member is unrestrained. Cooling contraction is negative.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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