Cp/Cpk (Capability)
Calculate Cp/Cpk (Capability) instantly with the exact formula and a worked example.
Cp/Cpk (Capability)
Lower spec limit (LSL)
Upper spec limit (USL)
Process mean (μ)
Standard deviation (σ)
Cpk
1.0667
Rating
Marginally capable
Cp
1.333
Cpu
1.067
Cpl
1.6
Expected nonconforming
687.9ppm
More about: Cp/Cpk (Capability)
What it calculates
The “Cp/Cpk (Capability)” calculator computes Cpk from 4 parameters: lower spec limit (lsl), upper spec limit (usl), process mean (μ), standard deviation (σ).
A handy everyday calculator for daily tasks.
Example calculation
With parameters Lower spec limit (LSL) = 9, Upper spec limit (USL) = 11, Process mean (μ) = 10.2, Standard deviation (σ) = 0.25 the result is 1.07 (Assumes a normal, statistically stable process).
How to use
- Enter lower spec limit (lsl), upper spec limit (usl), process mean (μ) and standard deviation (σ) — each field above is adjustable with a slider.
- Cpk is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Cp/Cpk (Capability) calculated?
The Cp/Cpk (Capability) calculator computes Cpk from lower spec limit (lsl), upper spec limit (usl), process mean (μ), standard deviation (σ). Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Cp/Cpk (Capability) calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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