Formula
Megavolts = Millivolts × 1e-9Direct answer
Multiply the entered millivolts value by 1e-9 to express it in megavolts (MV). This converts millivolt (mV) to megavolt (MV) within the documented voltage family.
Variables and formula
- Millivolts (mV): the source value measured in millivolt.
- Megavolts (MV): the same quantity expressed in megavolt.
- Conversion factor: 1e-9 megavolts per millivolt.
Megavolts = Millivolts × 1e-9
The generator emits numeric factors with at most 15 significant digits. Calculator results keep up to 10 significant digits for display; this formatting does not increase the precision of the measurement.
Unit definitions and named variants
Source unit: millivolt (mV). A millivolt is the SI decimal submultiple formed by applying milli (10^-3) to volt: 1 mV = 0.001 V. The canonical millivolt definition is used; no alternate named variant is implied. Reference: Bureau International des Poids et Mesures: The International System of Units (SI), 9th edition, version 4.01.
Target unit: megavolt (MV). A megavolt is the SI decimal multiple formed by applying mega (10^6) to volt: 1 MV = 1000000 V. The canonical megavolt definition is used; no alternate named variant is implied. Reference: Bureau International des Poids et Mesures: The International System of Units (SI), 9th edition, version 4.01.
The mV-to-MV direction remains inside the voltage quantity; it changes the unit label and numerical scale, not the kind of quantity being measured.
Relationship and precision
The named unit relationships are defined or exact, so the conversion is exact before display rounding and source-measurement uncertainty.
- mV relationship: The decimal-prefix relationship is exact.
- MV relationship: The decimal-prefix relationship is exact.
To audit the factor through the family base unit, divide the raw dataset factors 0.001 by 1000000. The generator emits that quotient once at 15 significant digits as the canonical direct factor 1e-9; runtime calculations do not divide the already-emitted base factors again.
Reproducible example
For 10 millivolts, 10 × 1e-9 = 1e-8 megavolts. Repeating the same multiplication with the stated factor reproduces the displayed conversion before interface rounding.
Directional scale check
Because one millivolt contains 1e-9 megavolts, the target number is smaller than the source number for every positive input. Zero maps to zero, while negative inputs are preserved as signed values under the stated direction convention.
| Source amount | Calculation | Target amount |
|---|---|---|
| 1 mV | 1 × 1e-9 |
1e-9 MV |
| 10 mV | 10 × 1e-9 |
1e-8 MV |
| 100 mV | 100 × 1e-9 |
1e-7 MV |
| 1000 mV | 1000 × 1e-9 |
0.000001 MV |
Interpretation
Read the result as megavolts, not millivolts. A value entered as mV leaves the calculator labelled MV; this directional distinction matters even when the two units describe the same voltage quantity.
Assumptions and limitations
- A negative value denotes polarity opposite the chosen positive reference.
- This family performs unit scaling only; it does not distinguish DC, AC RMS, peak, peak-to-peak, line-to-line, line-to-neutral, or phasor values.
- Voltage drop, electromotive force, and electric potential difference can share the volt but require contextual interpretation outside this converter.
Common mistakes
- mV is not mW; voltage and power are different quantities.
- MV means megavolt; mV means millivolt.
Continue within the Voltage family
See the Voltage conversion hub for its five-unit reference table and all 20 directed routes.
- Reverse the direction: Megavolts to Millivolts
- Compare another voltage route: Millivolts to Volts
- Compare another voltage route: Millivolts to Microvolts
- Compare another voltage route: Millivolts to Kilovolts
- Compare another voltage route: Megavolts to Volts
Assumptions
- The entered value uses millivolts exactly as labelled.
- A negative value denotes polarity opposite the chosen positive reference.
- Rounding and measurement uncertainty remain the user's responsibility.
Sources and methodology
CalcMotive publishes the formula and assumptions so you can decide whether the estimate fits your use case. See our methodology standards.
- The International System of Units (SI), 9th edition, version 4.01; Bureau International des Poids et Mesures; accessed Aug 7, 2026