Method
Equation
N = Σ niTworst = Σ |ti|TRSS = √Σ(ti²)Tolerances
Tolerance Stack calculator
Check a signed dimension chain against worst-case limits, RSS and your required range.
Decimal points and decimal commas are accepted.
Start with
Design check
Fails worst case
0.13 mm shortfall
Nominal result
0.5 mm
Possible range
0.27 to 0.73 mm
Worst-case tolerance
± 0.23 mm
RSS estimate
± 0.137 mm
Result = + Available space − Part A − Part B
Worst case is the default design check. RSS is only a statistical estimate when contributors are independent, centred and supported by process evidence.
Quick use
How to use this calculator
Choose an axial-clearance, total-length or remaining-space setup. Enter the drawing dimensions and ± tolerances; Dimvo shows the nominal closure, worst-case range, RSS estimate and pass/fail margin.
- Choose the quick setup closest to the assembly question.
- Enter each dimension and whether it adds or uses space.
- Optionally enter the required result range; Dimvo uses worst case for pass/fail.
Limits
Assumptions
- One-dimensional linear chain
- Worst case is the default design check
- RSS contributors must be independent and centred
Provenance
Independent calculation
Generated from the displayed equation and user inputs. This page does not reproduce a standard or third-party table.
Common questions
Frequently asked questions
What is worst-case tolerance stacking?
Worst case adds the absolute tolerance of every contributor. It checks the most extreme combination and does not assume variation is random or centred.
When can I use RSS?
RSS is suitable only when contributors are statistically independent and reasonably centred. It should not replace worst-case checks without process evidence.