Upper Control Limit (UCL) Calculator

Calculate UCL and LCL for Statistical Process Control (SPC).

Process Parameters

Process Mean (x̄)

Standard Deviation (σ)

Sample Size (n)

Control Limits

LCLMeanUCL

8.65810.00011.342

Upper Control Limit (UCL)11.3416+3σ

Lower Control Limit (LCL)8.6584-3σ

Standard Error0.4472

About this calculator

Overview

Control limits define the range of 'controlled' variation in a process. Points outside these limits suggest special cause variation.

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Pro Tips

Fun Facts

"Standard Shewhart control charts use 3-sigma limits."
"99.73% of points should fall within control limits if the process is stable and normal."