Featured · Guides
How to Calculate Current: A Complete Beginner Guide
Everything you need to work out electric current from power, voltage, and resistance, explained step by step.
Read the guideThe Current Calculator Blog
Clear guides to electric current: Ohm's law, power factor, single and three phase supplies, motors, wiring, and more.
Basics
Ohm's Law Explained: Voltage, Current and Resistance
The single most useful relationship in electronics, and how to rearrange it to find any value you need.
Guides
How to Find Current From Power and Voltage
Use I = P / V to turn a wattage rating and a supply voltage into the current a device draws.
Three Phase
Three Phase Current Calculation Made Simple
The sqrt(3) formula for line current, why it appears, and how to apply it to motors and panels.
Three Phase
Single Phase vs Three Phase: Current and Power
How current differs between single and three phase supplies, and when each one is used.
AC Theory
What Is Power Factor and Why It Changes Your Current
Real, reactive, and apparent power, and how power factor raises the current a load pulls.
Motors
How to Calculate Full Load Current for a Motor
Work out the full load current of single and three phase motors from horsepower or kilowatts.
Basics
Amps, Watts and Volts: How They Relate
A plain language look at the three quantities every current calculation depends on.
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