Voltage Converter: Table & Voltage Unit Calculator

This voltage converter lets you quickly switch between Volt, mV, kV or dBV. Designed for students, engineers and technicians, it includes a full conversion table and real-world use with Ohm’s law.

Value to convert

0 250 500 1 000

From

Common conversions: 230 V → kV 1 kV → V 5 V → mV 1000 mV → V 1 MV → kV 230 V → dBV

Result

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Full conversion table

Unit	Symbol	Value

Real-world examples

Ohm's Law — V = R × I

U = R × I | R = U / I | I = U / R (U=V · R=Ω · I=A)

U — Voltage (V)

R — Resistance (Ω)

I — Current (A)

History

No conversions yet.

How to convert electrical voltage units?

Electrical voltage (or potential difference) is measured in Volts (V), the SI unit defined by Alessandro Volta in the 19th century. Voltage represents electrical energy available per unit charge: 1 V = 1 J/C (joule per coulomb). Conversions between submultiples and multiples of the volt are essential in electronics, electrical engineering and energy distribution.

From microvolts to megavolts

Voltages span extreme orders of magnitude: from the microvolt (µV, 10⁻⁶ V) measured in brain electrophysiology (EEG) to the megavolt (MV, 10⁶ V) of extra-high-voltage power transmission lines. In everyday electronics: 1.5 V (AA battery), 3.3–5 V (logic circuits), 12 V (automotive), 120/240 V (mains), 400 V (industrial three-phase).

Ohm's law: V = R × I

Ohm's law relates voltage (V in volts), resistance (R in ohms) and current (I in amperes): V = R × I. Knowing two of these quantities, you can calculate the third. Example: a 12 V circuit with 100 Ω resistance carries current I = 12/100 = 0.12 A = 120 mA. Our integrated calculator lets you perform these calculations directly.

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