Quality and production
Xbar control limits
Calculates the existing sigma-based Xbar limits and Xbar-R chart limits from the grand mean and average range.
Related calculators
c-chart control limits
Calculates basic c-chart limits for an average count of nonconformities.
np-chart control limits
Calculates basic np-chart limits from pBar and sample size without automatic process assessment.
p-chart control limits
Calculates basic p-chart limits from pBar and sample size without creating an SPC chart.
u-chart control limits
Calculates basic u-chart limits from uBar and sample size.
DPMO
Calculates defects per million opportunities from defects, units, and opportunities per unit.
PPM defects
Calculates defects per million units as an auxiliary quality metric.