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Electrical calculators
Quick checks for the job, with the working shown every time. Free, no sign-up.
Voltage dropSingle or three-phase, mV/A·m method, checked against the 5% limit.Cable sizeSmallest cable that passes current capacity, voltage drop and fault loop.Fault-loop max lengthMaximum circuit length for B, C and D curve breakers.Ohm's law and powerVolts, amps, ohms and watts, plus kW to amps for single and three-phase.
Maximum demandComing soon
Conduit fillComing soon
Cable derating (grouping, insulation)Coming soon
Values are indicative. Verify against the current standard before relying on them. See the disclaimer.
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