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Tolerance Chain Calculator

Dimension chain stack-up analysis — forward & reverse, worst-case & RSS

Dimension Entries

Add each dimension with its nominal value and tolerances. Use negative nominal for subtracting dimensions.

Tolerance Allocation

Enter total tolerance budget and define dimensions. The system allocates tolerance to each dimension.

Formula Reference

Worst-Case (WC)

Totalmax = Σ(基本尺寸i + Upperi)
Totalmin = Σ(基本尺寸i + Loweri)
All tolerances add linearly — 100% of assemblies within spec.

Root Sum Square (RSS)

TRSS = √(Σ Ti²)
Statistical method — assumes normal distribution of tolerances.
Typically covers 99.73% of assemblies (±3σ).