Tolerance Stack-Up Calculator.
Worst-case and RSS (Root Sum Square) analysis for assembly tolerance stacks. Add up to 20 dimensions with bilateral or unilateral tolerances.
| # | Description | Nominal | + Tol | − Tol | Direction |
|---|
How it works
Worst-Case (WC): Sums all tolerances assuming every dimension is at its limit simultaneously. Most conservative — guarantees fit but may over-tolerance.
Stack = Σ(nominal × dir), Tol = Σ|tol|
RSS (Root Sum Square): Statistical method assuming dimensions are normally distributed. Smaller stack but accepts low (<0.27%) probability of failure.
Tol = √(Σ tol²)