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Calculators

Free web calculators plus calculation workbooks for deeper design work.

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Technical drawing of a supply feeding a load through a long two-core cable, with a teal line sloping down to show the voltage falling along the run.

Web calculator Free to use

Voltage Drop Calculator

Single-phase, three-phase and DC voltage drop in sq mm or AWG under 15 national codes (IEC, NEC, BS 7671, SP 30 and more), with your own cable data if you have it.

Price: Free

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