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Electrical Load Calculator
Ohm law relates voltage, current and resistance, and power is voltage times current. Breakers are sized at 125 percent of continuous load, which is why a 15 A circuit should carry no more than 12 A continuously.
How it works
Voltage
Current
Power (leave 0 to calculate)
Resistance (leave 0 to calculate)
Supply
Power factor
Power
Current
Resistance
Apparent power
Recommended breaker size
Note
Frequently asked questions
How do I use the Electrical Load Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.