Linear Thermal Expansion Calculator
Estimate dimensional change for a uniform material undergoing a temperature change.
How to use this calculator
- Enter original length in metres, coefficient in microstrain per degree Celsius and signed temperature change.
- Check that every input uses the stated units and covers the same period, population or project scope.
- Change one assumption at a time when comparing scenarios.
Formula used by linear thermal expansion calculator
ΔL = L₀ × α × ΔT
- ΔL = L₀ × α × ΔT
- The coefficient is treated as constant across the entered range. Constraints, joints and non-uniform temperatures can alter actual behaviour.
- Inputs are validated against the tool-specific constraints; displayed results are rounded for readability.
Worked examples
Worked example
A six-metre steel component with an approximate coefficient of 12 microstrain/°C changes length by about 3.24 mm over a 45°C rise.
The calculator converts the supplied coefficient from microstrain per degree into a length change and final length.
The calculator converts the supplied coefficient from microstrain per degree into a length change and final length.
Understanding the result
Estimate dimensional change for a uniform material undergoing a temperature change.
The coefficient is treated as constant across the entered range. Constraints, joints and non-uniform temperatures can alter actual behaviour.
Important notes
The coefficient is treated as constant across the entered range. Constraints, joints and non-uniform temperatures can alter actual behaviour.
Treat the result as an estimate for the assumptions entered; verify important specifications against the relevant source or professional guidance.
Frequently asked questions
Can temperature change be negative?
Yes. A negative change represents cooling and typically gives a negative length change for a positive expansion coefficient.
Is the coefficient identical for all materials?
No. Use a material-specific value from a reliable technical reference.
How should I use this result?
Enter original length in metres, coefficient in microstrain per degree Celsius and signed temperature change.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate Percentage Change — Learn the percentage change formula, how to calculate increases and decreases, and why the original value matters.
- Percentage Change vs Percentage Difference — Understand the difference between percentage change and percentage difference, including when each formula is appropriate.
- Percentage Change — Learn what percentage change means, how to calculate increases and decreases, and how the original value affects the result.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.