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Calculator · Reference temperature ISO 1

Estimate thermal expansion

If the part temperature deviates from the reference temperature per ISO 1 (20 °C), your part expands. Pick the material or enter the expansion coefficient manually — the calculator estimates how much the nominal dimension changes for solid material.

Guide values at 20 °C. The actual coefficient depends on alloy, fibre direction and temperature range — the datasheet of your material governs.
Calculation: ΔL = L₀ · α · (t − 20 °C). An estimate for solid material at homogeneous part temperature — relative to the reference temperature per ISO 1.
Result
Length at part temperature (mm)
Thermal expansion ΔL (µm)
Temperature difference (K)
Tolerance consumed
Sketch · overall length
Expansion shown exaggerated — not to scale
Nominal per drawing (20 °C)
Dimension at part temperature —
This is why CSL measures at reference temperature: parts are acclimatised in the temperature-controlled measuring room before measurement — a substantial part of the turnaround of a dimensional inspection. Our determined measuring-room temperature is 20.3 °C. Your measured values are thus comparable with the drawing.
Tolerance budget
Production target mid-tolerance · shift not to scale
Nominal
below 30 % from 30 % above 50 %
Enter the deviations (upper above lower) to see how much of the tolerance the temperature consumes.
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