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Calculator Library
Every calculator on this site, grouped by topic, free to use.
Electrical Basics
The basics behind every circuit.
Electrical Basics
Ohm's Law
Enter any two of volts, amps and ohms to work out the third, plus the power in watts.
Open calculator → Electrical BasicsWatts, Amps & Volts
Work out watts from volts and amps, amps from watts and volts, or volts from watts and amps, for DC or 240V AC.
Open calculator → Electrical BasicsWire Gauge (AWG & mm²)
Turn AWG (B&S) sizes into copper cross-section in mm², or mm² into the nearest AWG, with a size chart.
Open calculator → Electrical BasicsmAh, Ah & Wh Converter
Change mAh to Ah and Wh, or Wh back to Ah and mAh, using the battery's nominal voltage.
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