Millivolt is 0.001 volt units.
Millivolts to Zeptovolts Converter — mV to zV
Convert Millivolt (mV) to Zeptovolt (zV) using the exact conversion factor (1 millivolt = 1e+18 zeptovolt). See the formula, worked examples, and conversion table.
Millivolts to Zeptovolts converter
Converter
Electricity Converter
Convert electrical units by family and calculate voltage, current, resistance, power, and energy with context values.
Context values
Some unit families need one extra value for a physically accurate result.
Zeptovolt is 1e-21 volt units.
Result = input x 0.001 / 1e-21.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Millivolts to Zeptovolts
Millivolt and Zeptovolt both belong to the electricity family — voltage, current, resistance, power, or energy — units that show up constantly when working across the different standards used by household wiring (120V/240V depending on region), automotive electrical systems (12V/24V), and electronics design. Specifically: Millivolt is 0.001 volt units, and zeptovolt is 1e-21 volt units.
Formula
zeptovolts = millivolts × 1e+18
This factor comes from each unit's defined relationship to the category's base unit: 1 millivolt equals 0.001 base units, and 1 zeptovolt equals 1e-21 base units, so dividing one by the other gives the direct millivolt-to-zeptovolt factor of 1e+18.
Simple example
1 mV × 1e+18 = 1e+18 zV
1 millivolt = 1e+18 zeptovolts.
Real-world example
120 mV × 1e+18 = 1.2e+20 zV
120 millivolts = 1.2e+20 zeptovolts.
Conversion table
| Millivolt (mV) | Zeptovolt (zV) |
|---|---|
| 1 mV | 1e+18 zV |
| 5 mV | 5e+18 zV |
| 12 mV | 1.2e+19 zV |
| 24 mV | 2.4e+19 zV |
| 120 mV | 1.2e+20 zV |
| 240 mV | 2.4e+20 zV |
Reverse conversion: Zeptovolt to Millivolt
1e+18 zV × 1e-18 = 1 mV
1e+18 zeptovolts = 1 millivolts.
millivolts = zeptovolts × 1e-18
For a page dedicated to this direction, see Zeptovolt to Millivolt.
Understanding the Millivolt (mV)
Millivolt is 0.001 volt units.
Understanding the Zeptovolt (zV)
Zeptovolt is 1e-21 volt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptovolts are in 1 millivolt?
1 millivolt equals 1e+18 zeptovolts, using the exact defined conversion factor rather than an estimate.
How do I convert millivolt to zeptovolt?
Multiply the millivolt value by 1e+18. The converter above does this instantly to whatever precision you set.
How do I convert zeptovolt back to millivolt?
Use the reverse factor: 1 zeptovolt equals 1e-18 millivolts. You can also use the swap control in the converter above to flip the direction instantly.
What is a millivolt?
Millivolt (mV) is a unit of electricity.
What is a zeptovolt?
Zeptovolt (zV) is a unit of electricity.
Is the millivolt to zeptovolt conversion exact?
Yes. Both millivolt and zeptovolt are defined by fixed standards rather than physical artifacts, so the factor of 1e+18 used above is exact to as many digits as you choose to display.
What's the difference between voltage, current, and resistance?
Voltage (volts) is the electrical potential difference driving current through a circuit. Current (amperes) is the rate of flow of electric charge. Resistance (ohms) is how much a component opposes that flow. They're related by Ohm's law (V = I × R), but they are distinct physical quantities, and this page converts between units of just one of them.