Calculates main earth, bonding and cpc sizes, includes the Adiabatic Equation.

Calculate the PFC from the Zs or Ze and voltage values for free!

Convert and calculate kVA, Amps, Volts, kW and Power Factor Single & Three phase

Calculate to or from Watts, Amps, Volts with this handy power converter SP & TP

Ohm's Law calc for Volts, Amps, Ohms & Watts (Power Current Resistance Voltage)

Pre-amendment 3 version, useful for looking up old Zs values before amendment 3.

A Free electrical calculator to convert from Amps to Watts

Cable size calculator for Android to BS 7671 amendment 3 2015.

Calculate the maximum Zs values for MCB's and fuses to BS 7671 Amendment 3 2015.