Practice Lab

Training Calculators

Try the calculations you'll meet in your lessons and quizzes. Change the numbers, press calculate and see the result straight away. Everything runs in your browser.

DLEToleranceCp / CpkDefect & YieldPPM / DPMOStd deviation

Training aids only — not certified engineering calculations.

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DLE Calculator (Direct Labour Efficiency)

DLE = (Actual Good Output ÷ Target Output) × (Standard Labour Hours ÷ Actual Labour Hours). Enter your shift data below.

More practice calculators

Short, focused exercises — one skill each.

Tolerance Practice

Check whether a measured size sits inside its allowed limits.

Capability Practice (Cp / Cpk)

See how well a process fits inside its specification.

Defect & Yield Practice

Turn defect counts into a defect rate and yield.

PPM / DPMO Practice

Express quality as defects per million.

Standard Deviation Practice

Find the spread of a data set, sample or population.