About this converter
Voltage measures electric potential difference, or energy per unit charge. Volt (V) is the SI unit, 1 kV equals 1,000 V, 1 mV equals 0.001 V, and 1 µV equals 0.000001 V.
This converter supports common SI voltage prefixes from nanovolts to gigavolts. Electricians, electronics technicians, sensor engineers, power-system designers, physics students, and lab technicians use these conversions for circuit readings, power equipment, instrumentation, and high-voltage documentation.
How to Use This Converter
- Enter the voltage value.
- Select the source unit from the From menu.
- Select the target unit from the To menu.
- Read the converted result and formula line.
- Use Swap to reverse the selected units.
Units Covered
| Unit | Symbol | Common Use |
|---|---|---|
| Volt | V | SI voltage, circuit analysis, and everyday electrical ratings. |
| Millivolt | mV | Sensors, audio signals, thermocouples, and small electronics. |
| Microvolt | µV | Precision instrumentation and low-level signal measurements. |
| Kilovolt | kV | Power distribution, insulation testing, and high-voltage equipment. |
| Megavolt | MV | Very high voltage systems and scientific equipment. |
| Gigavolt | GV | Extreme scientific and theoretical voltage scales. |
| Nanovolt | nV | Ultra-low noise measurements and precision lab instruments. |
Volts to Millivolts Conversion Table
| From | To |
|---|---|
| 0.001 V | 1 mV |
| 0.01 V | 10 mV |
| 0.1 V | 100 mV |
| 0.5 V | 500 mV |
| 1 V | 1,000 mV |
| 1.5 V | 1,500 mV |
| 3.3 V | 3,300 mV |
| 5 V | 5,000 mV |
| 12 V | 12,000 mV |
| 24 V | 24,000 mV |
| 120 V | 120,000 mV |
| 240 V | 240,000 mV |
How to Convert Volts to Millivolts
Volts to millivolts
For example, 3.3 V x 1,000 = 3,300 mV.
Millivolts to volts
For example, 2500 mV / 1,000 = 2.5 V.
When You Need to Convert Voltage
Electronics work often uses volts for supply rails and millivolts for sensor outputs. A 3.3 V logic rail equals 3,300 mV, while a 25 mV sensor signal equals 0.025 V.
Power systems use kilovolts for distribution and transmission equipment. A 13.8 kV feeder equals 13,800 V, which is easier to compare with insulation and meter ratings.
Precision measurement can involve microvolts or nanovolts. A 500 µV thermocouple signal equals 0.0005 V, so unit conversion helps avoid misplaced decimal points in data sheets and lab notes.