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Voltage Converter

Convert voltage units: Volt, mV, kV, MV, µV, dBV, dBmV and more. Full table, Ohm's law calculator and real-world examples.

0 250 500 1 000
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)

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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.

Frequently asked questions

In France and most European countries, mains voltage is 230 V (phase-neutral) at 50 Hz. Voltage between two phases (three-phase) is 400 V. In the United States ... In France and most European countries, mains voltage is 230 V (phase-neutral) at 50 Hz. Voltage between two phases (three-phase) is 400 V. In the United States and Canada, residential voltage is 120 V (60 Hz), with 240 V for high-power appliances (oven, air conditioner). In Japan: 100 V at 50 or 60 Hz depending on the region.

dBV (decibel-volt) is a logarithmic voltage unit referenced to 1 V: dBV = 20 × log₁₀(V). Examples: 0 dBV = 1 V, +6 dBV ≈ 2 V, −20 dBV = 0.1 V. dBmV is reference... dBV (decibel-volt) is a logarithmic voltage unit referenced to 1 V: dBV = 20 × log₁₀(V). Examples: 0 dBV = 1 V, +6 dBV ≈ 2 V, −20 dBV = 0.1 V. dBmV is referenced to 1 millivolt: dBmV = 20 × log₁₀(V/0.001). Relationship: dBV = dBmV − 60. dBmV is widely used in cable TV (CATV) and radio frequencies to express weak signal levels.

Lightning is an electrostatic discharge between clouds and the ground (or between clouds). The potential difference can reach 1 to 5 gigavolts (10⁹ V), millions... Lightning is an electrostatic discharge between clouds and the ground (or between clouds). The potential difference can reach 1 to 5 gigavolts (10⁹ V), millions of times mains voltage. This extreme voltage allows electricity to travel through several kilometers of normally insulating air. However, the duration is extremely short (a few microseconds), which limits the total energy to about 1-5 gigajoules.

The conversion is simple: 1 V = 1,000 mV, so to convert mV to V, divide by 1,000. Examples: 500 mV = 0.5 V; 3,700 mV = 3.7 V; 230,000 mV = 230 V. To convert V t... The conversion is simple: 1 V = 1,000 mV, so to convert mV to V, divide by 1,000. Examples: 500 mV = 0.5 V; 3,700 mV = 3.7 V; 230,000 mV = 230 V. To convert V to mV, multiply by 1,000. For kilovolts: 1 kV = 1,000 V. The rule is always the same: each prefix represents a power of 10 (milli = 10⁻³, kilo = 10³, mega = 10⁶).

Ohm's law states that V = R × I (voltage = resistance × current). To calculate voltage: multiply resistance in ohms (Ω) by current in amperes (A). Examples: a 1... Ohm's law states that V = R × I (voltage = resistance × current). To calculate voltage: multiply resistance in ohms (Ω) by current in amperes (A). Examples: a 100 Ω resistor carrying 0.5 A → V = 100 × 0.5 = 50 V. A 12 V circuit with 60 Ω → I = 12/60 = 0.2 A. The integrated calculator handles all three formulas automatically: leave one field empty to calculate the missing quantity.

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