Tester
Tolerance Stack-Up Analyzer
Analyze worst-case and RSS stack-ups from a simple line-based tolerance table so engineers can review fit windows faster than they can with a fragile spreadsheet.
CSV: label, nominal, plusTol, minusTol, direction
RSS estimate
Row breakdownContribution by stack row
Housing width (+)
nominal 50.000 | min contribution 49.900 | max contribution 50.100
Spacer A (+)
nominal 10.000 | min contribution 9.950 | max contribution 10.050
Bracket tab (+)
nominal 8.000 | min contribution 7.960 | max contribution 8.080
Shaft shoulder (-)
nominal 66.000 | min contribution -66.020 | max contribution -65.980
Stack-up scope
This MVP focuses on 1D stack-ups with nominal values, bilateral or unilateral tolerances, and additive or subtractive directions. It is meant for fast review, not full GD&T semantic modeling.
Use this tool when
These are the practical situations where this workflow usually earns its keep.
You need to build or review a tolerance stack more cleanly than a rough worksheet.
You want a browser-local pass before carrying the reviewed stack result into design, QA, or release discussion.
You need a smaller, cleaner review surface during mechanical design review and manufacturing readiness.
Daily workflow acceleration
Tolerance Stack-Up Analyzer helps when teams need to build or review a tolerance stack more cleanly than a rough worksheet without opening a heavier system or rebuilding the same transformation manually every time.
Review and handoff clarity
A focused output is useful when the next step is carrying the reviewed stack result into design, QA, or release discussion and the current raw input would otherwise slow down the reviewer or teammate.
Lower-friction local handling
For mechanical design review and manufacturing readiness, keeping the task in the browser is helpful because the source material often does not need to leave the user’s machine just to answer this one question.
Common mistakes to avoid
These are the checks that usually keep the output useful instead of misleading.
A stack result is only useful if the dimensional assumptions and assembly model behind it are correct.
Treating a quick calculator result as if it replaced the formal engineering record.
Forgetting to verify the assumptions, units, or code basis that sit behind the numbers.
Learn how to use this tool
Review worst-case and RSS tolerance stacks from simple tabular inputs instead of maintaining fragile spreadsheets. This guide focuses on how teams use it for mechanical design review and manufacturing readiness when the real job is to build or review a tolerance stack more cleanly than a rough worksheet.
Read the guideTell us what is missing
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