Can I enter six-sigma study widths?

Convert every component to a standard deviation first. Mixing a study width with standard deviations changes the combined result.

Can total tolerance replace part variation?

No, part standard deviation represents observed process variation. Drawing tolerance belongs to a separate percent-tolerance assessment.

Why is the variance percentage smaller?

Variance contribution uses squared standard deviations. Its denominator and interpretation differ from the study percentage used by the headline.

Is ten percent always the acceptance limit?

No, enter the limit required by your customer or measurement plan. The illustrative default is not a universal acceptance standard.

Quality & Metrology calculator

Gauge R&R Percentage Calculator

Assess the measurement share of variation in a completed gauge study. Enter standard deviation components on one dimensional basis and your approved percentage limit.

What this calculator does

Compare combined measurement standard deviation with total study variation and your entered acceptance limit.

Formula used

Gauge standard deviation = sqrt(repeatability² + reproducibility²)
Total standard deviation = sqrt(gauge deviation² + part deviation²)
Study percentage = gauge deviation ÷ total deviation × 100
Variance share = gauge variance ÷ total variance × 100
Limit margin = maximum study percentage − study percentage

Inputs explained

Repeatability Standard Deviation: Equipment component from the completed variance-component study.
Reproducibility Standard Deviation: Study component including applicable operator and interaction effects.
Part-To-Part Standard Deviation: Part component from that same representative study.
Maximum Study Percentage: Approved maximum measurement share of total study standard deviation.

How to use the result

Best suited to completed gauge study Review, measurement contribution comparison.
This summary does not estimate components from raw crossed study data. Study percentage differs from percent tolerance and variance contribution.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Common questions

Can I enter six-sigma study widths? Convert every component to a standard deviation first. Mixing a study width with standard deviations changes the combined result.
Can total tolerance replace part variation? No, part standard deviation represents observed process variation. Drawing tolerance belongs to a separate percent-tolerance assessment.
Why is the variance percentage smaller? Variance contribution uses squared standard deviations. Its denominator and interpretation differ from the study percentage used by the headline.
Is ten percent always the acceptance limit? No, enter the limit required by your customer or measurement plan. The illustrative default is not a universal acceptance standard.

Related guides

Last reviewed 2026-10-06.