Calculate amps from watts and volts, volts and ohms, or watts and ohms. This amps calculator estimates electrical current, milliamps, microamps, voltage, resistance, power, and basic circuit load values.
Watts and volts:
Enter watts and volts. The calculator uses A = W ÷ V.
Volts and ohms:
Enter volts and ohms. The calculator uses A = V ÷ Ω.
Watts and ohms:
Enter watts and ohms. The calculator uses A = √(W ÷ Ω).
An amps calculator helps estimate electrical current when you know watts, volts, or ohms.
It can help with circuit load estimates, appliance current, battery planning, solar projects, power supply sizing, DC circuits, electronics projects, and basic electrical troubleshooting.
Your result shows estimated amps, milliamps, microamps, watts, volts, ohms, formula used, current category, and comparison scenarios based on the values entered.
Use A = W ÷ V when you know watts and volts. Divide watts by volts to get amps.
Use A = V ÷ Ω. Divide volts by ohms to estimate current in amps.
Use A = √(W ÷ Ω). Divide watts by ohms, then take the square root.
No. Amps measure current, while watts measure electrical power. They are connected by the formula W = V × A.