United States • dedicated calculator
Process Capability Cpk Calculator
Calculate Cp, Cpk, Cpu, Cpl, sigma distance and approximate defect rate from process mean, standard deviation and specification limits.
Specific inputs
live visual
transparent result
live visual
transparent result
1. EnterCalculator-specific values
2. ReviewUnits and assumptions
3. CalculateDedicated formula engine
4. VerifyResult, visual and guidance
Calculator inputs
Process Capability Cpk Calculator results
How the calculation works
Cp compares specification width with 6σ; Cpk is the smaller one-sided distance divided by 3σ.
What to verify
Capability indices assume a stable process and should be paired with distribution and control-chart checks.
How accurate is this calculator?
It is a transparent planning calculation based on the entered values and stated assumptions. Verify inputs and obtain professional or supplier confirmation where the decision is consequential.
Does it use U.S. defaults?
Yes. U.S. units, terminology, pricing conventions and rules are the primary defaults where location matters.
Is data sent to a server?
No. The calculation runs locally in the browser and does not send entered values to a remote calculation service.