1 V in every unit
Values update with the converter above. Select a row to open that conversion's detailed page.
- Kilovolt0.001 kV
- Ampere— A
- Milliampere— mA
- Millivolt1,000 mV
- Kiloampere— kA
Popular conversions
4 pairsVolt ↔ Kilovolt
V ↔ kV
Ampere ↔ Milliampere
A ↔ mA
Volt ↔ Millivolt
V ↔ mV
Ampere ↔ Kiloampere
A ↔ kA
Unit guides
6 unitsDetailed guide to Electricity
Electrical calculations rely on several distinct physical quantities, including voltage and current.
This converter keeps the two fundamental families separate: voltage units convert to voltage units, and current units convert to current units. A circuit equation is needed to relate one family to the other.
- Physical quantity group
- Electricity
- Voltage unit
- Volt
- Current unit
- Ampere
- Typical prefixes
- kilo and milli
- Typical use
- Power systems, devices and instrumentation
Electrical units and safe interpretation
Voltage, current, resistance, power and energy describe different quantities. Converting the unit does not make an electrical installation safe or determine whether a component is suitable.
Use the calculator for estimates and unit checks. For live circuits, mains work or protection-device sizing, follow the applicable code and use a qualified professional.
Voltage and current
Voltage represents electric potential difference, while current represents the rate of electric charge flow.
They are different physical quantities, even though both rely heavily on metric prefixes in practical work. A value in volts cannot be directly converted into amperes without information about the circuit, such as resistance, impedance or power.
Volts, kilovolts, amperes and milliamperes
The volt and ampere are standard SI electrical units. Their prefixed forms are used to express much larger or smaller values more clearly.
One kilovolt equals 1,000 volts, one volt equals 1,000 millivolts, and one ampere equals 1,000 milliamperes. The prefix changes the scale, not the physical quantity being measured.
When voltage and current can be related
Ohm's law relates voltage, current and resistance in appropriate circuits: V = I × R. Electrical power also relates voltage and current in simple cases: P = V × I. These are calculations with additional inputs, not direct unit conversions.
Use a dedicated electrical calculator when you know the relevant circuit conditions. For a label reading such as 500 mA or 12 V, this converter is designed for the exact decimal-prefix conversion only.
Reading equipment labels safely
A voltage rating, current rating and power rating describe different things. A USB supply marked 5 V and 2 A is not the same as a fixed 10 W load in every operating condition; equipment and power-delivery standards can set their own limits.
For mains electricity, battery packs, chargers or high-current systems, follow the manufacturer's specification and applicable safety guidance. A numerical unit conversion does not verify electrical compatibility or safety.
Unit comparison table
| Unit | Symbol | SI equivalent | System | Common use |
|---|---|---|---|---|
| Millivolt | mV | 0.001 V | SI-prefixed voltage unit | Sensors, small signals and electronics |
| Volt | V | 1 V | SI derived unit | Device, battery and circuit voltage |
| Kilovolt | kV | 1,000 V | SI-prefixed voltage unit | Power transmission and high-voltage equipment |
| Milliampere | mA | 0.001 A | SI-prefixed current unit | Electronics, sensors and small devices |
| Ampere | A | 1 A | SI base unit | Circuit current and electrical equipment ratings |
| Kiloampere | kA | 1,000 A | SI-prefixed current unit | Large power systems and fault-current ratings |
Electrical units
| Unit | Symbol | Information |
|---|---|---|
| Volt | V | View unit guide |
| Kilovolt | kV | View unit guide |
| Ampere | A | View unit guide |
| Milliampere | mA | View unit guide |
| Millivolt | mV | View unit guide |
| Kiloampere | kA | View unit guide |