About The Tolerance Stackup Calculator

The Tolerance Stackup Calculator combines nominal dimensions and tolerances using worst-case or RSS methods to estimate assembled dimensional variation.

How to Use the Tolerance Stackup Calculator Online

1. Select worst-case or RSS stackup mode.
2. Enter nominal dimensions and matching tolerances as comma, space, or semicolon separated values.
3. Run the calculator to review nominal stack length, tolerance bands, and selected min/max values.

Choosing Options Correctly

Use worst-case for conservative interchangeability checks and RSS only when statistical assumptions are justified. Direction/sign conventions, process capability, distributions, and assembly constraints need engineering review.

Common Use Cases

• Check clearance or gap stackups.
• Compare worst-case and RSS assumptions.
• Review early dimensioning choices before detailed drawings.

Quick FAQ

Do nominal and tolerance counts need to match?
Yes. Each nominal dimension should have a corresponding tolerance so the stack represents the real chain.

Does RSS guarantee fit?
No. RSS is statistical and depends on process assumptions. Worst-case stackup is safer when every part must assemble.

What should I check before release drawings?
Confirm the dimension chain, signs, datum scheme, tolerance type, process capability, and whether the stack should be worst-case or statistical.

Can this handle nonlinear or angular stackups?
No. It is best for simple linear stacks. Complex geometry should be modeled with a proper tolerance analysis method.