Voltage Calculator

Voltage Calculator

A simple Voltage Calculator can be used to Volts convert from current (Amps), power (Watts), resistance (Ohms) – KALK.PRO's tool allows you to choose between DC and AC current.

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Also see


Current*, А
Resistance*, Ω



How to calculate the voltage?

Electrical voltage (U) – scalar physical quantity that is equal to the work of an electric field to move a charge from one point of a circuit to another. The international unit of measure is the Volt (V).

This application allows you to accurately calculate voltage according to Ohm's law (by current, resistance, power). To get the result - fill in all the fields and click "Calculate".

Voltage calculation formulas

— Voltage through resistance and amperage: U = I × R
— Voltage through wattage and amperage: U = P / I
— Voltage through power and resistance: U = √(P × R)

  • I – amperage, A;
  • R – resistance, Ω;
  • P – power, W.
Calculation of voltage (Ohm's law)
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