To convert millivolts to volts, multiply by 0.001. That factor is the whole relationship: both units measure the electrical potential difference driving a current, so the conversion is a proportion with no offset and no substance-specific constant.
The volt is the SI unit of electric potential: one joule of energy per coulomb of charge moved. Millivolts are the working scale of sensors and thermocouples, where the whole usable signal may span less than a volt.
The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in volts, so you can sanity-check whether your answer is a plausible size.
The formula
millivolts- The amount you are converting, in millivolts
0.001- The exact number of volts in one millivolt
volts- The converted result
How it works, step by step
- Enter the value in millivolts.
- It is multiplied by 0.001, the exact factor between the two units.
- The answer is shown in volts, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Car battery: 1.26e+04 mV in volts
Take car battery, roughly 1.26e+04 mV. The conversion is a single multiplication — 1.26e+04 × 0.001 — giving 12.6 V. Because the relationship is proportional, doubling the input doubles the answer to 25.2 V.
UK mains: 2.3e+05 mV in volts
At 2.3e+05 mV (uk mains), the same quantity in volts is 2.3e+05 × 0.001 = 230 V. One millivolt is 0.001 volts, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many volts are in one millivolt?
Exactly 0.001. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert millivolts to volts?
volts = millivolts × 0.001. Reversed, millivolts = volts ÷ 0.001, which is the same as multiplying by 1000.
Which is the bigger unit, the millivolt or the volt?
The volt. One millivolt is only 0.001 of a volt, so it takes 1000 millivolts to make one volt.
What does this quantity actually measure?
Both units measure the electrical potential difference driving a current. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a millivolt?
Millivolts are the working scale of sensors and thermocouples, where the whole usable signal may span less than a volt.
What is a volt?
The volt is the SI unit of electric potential: one joule of energy per coulomb of charge moved.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Millivolts to volts reference tables
| Millivolts | Volts |
|---|---|
| 0.5 mV | 0.0005 V |
| 1 mV | 0.001 V |
| 2 mV | 0.002 V |
| 3 mV | 0.003 V |
| 5 mV | 0.005 V |
| 10 mV | 0.01 V |
| 20 mV | 0.02 V |
| 25 mV | 0.025 V |
| 50 mV | 0.05 V |
| 75 mV | 0.075 V |
| 100 mV | 0.1 V |
| 250 mV | 0.25 V |
| 500 mV | 0.5 V |
| 1000 mV | 1 V |
| 5000 mV | 5 V |
Exact factor: 1 millivolt = 0.001 volts.
| Quantity | mV | V |
|---|---|---|
| AA alkaline cell | 1500 mV | 1.5 V |
| USB bus | 5000 mV | 5 V |
| Car battery | 1.26e+04 mV | 12.6 V |
| UK mains | 2.3e+05 mV | 230 V |
| US mains | 1.2e+05 mV | 120 V |
| Overhead distribution line | 1.1e+07 mV | 1.1e+04 V |
Published reference values, converted with the same factor this page uses.