USL Formula

USL represents the highest range of valuables. It is the benchmark and below which all the products and services perform. The upper specification value is accompanied by the Lower Specification Limit (LSL). The page offers you the USL formula to perform Upper Specification Limit calculation. To find USL, multiply the process capability index and Process Standard deviation and then multiply the obtained value with 6. Add it with Lower Specification Limit (LSL).

Upper Specification Limit Calculation Formula


Upper Specification Limit (USL) = ( c × 6 × s ) + LSL


c = Process Capability Index
s = Process Standard Deviation

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Upper specification limit (USL) is also shortly referred as Upper Specific Limit. Specification limit is the target value set by the customer. USL formula is essential in finding the highest range of variables.

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