Convert Apparent Power from Millivolt-Amperes (mVA) to other units

Millivolt-Ampere Conversion Formulas

Millivolt-Ampere to Volt-Ampere Conversion Formula

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Millivolt-Ampere to Kilovolt-Ampere Conversion Formula

To convert apparent power from millivolt-amperes (mVA) to kilovolt-amperes (kVA), divide by 1,000,000 (10⁶).

• kVA = mVA ÷ 1,000,000

A millivolt-ampere is one thousandth of a volt-ampere and a kilovolt-ampere is one thousand volt-amperes, so the two units sit exactly six decimal places apart. Multiply by 10⁶ to go from kVA back to mVA.

Step-by-Step Example

A lab bench aggregates the standby draw of 1,200 devices, each measured at about 350 mVA, and the building electrical model works in kVA:

1. Total the apparent power: 1,200 × 350 = 420,000 mVA
2. Divide by 1,000,000: 420,000 ÷ 1,000,000 = 0.42 kVA

Twelve hundred "off" devices therefore still occupy about 0.42 kVA of capacity — small against a 500 kVA transformer, but not zero.

Quick Reference Table

mVA	kVA
1,000	0.001
10,000	0.01
100,000	0.1
420,000	0.42
1,000,000	1
5,000,000	5

Six Orders of Magnitude in One Building

This conversion spans the full hierarchy of an electrical installation in a single step: mVA is the scale of a sleeping gadget or a sensor circuit, kVA is the scale of transformers and generator sets, and nothing but a factor of 10⁶ separates them. It gets used in practice for exactly the kind of aggregation in the example — vampire-load audits, PoE and IoT deployment studies, telecom shelters full of small always-on loads — where thousands of milli-scale figures must be rolled up into the kVA units that switchgear and UPS sizing use. The arithmetic risk is purely one of dropped zeros: at six places of shift, a spreadsheet mixing mVA readings with kVA totals mislabels results by a factor of a thousand in whichever direction the error falls, and both wrong answers (0.00042 kVA or 420 kVA for the example above) look "plausible" in isolation. Sanity-check against physical intuition — a whole rack of idle electronics should land in the fractional-kVA range — and the six zeros stay under control.

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Millivolt-Ampere to Megavolt-Ampere Conversion Formula

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Millivolt-Ampere to Gigavolt-Ampere Conversion Formula

What is a Millivolt-Ampere (mVA)?

A Millivolt-Ampere (mVA) is a unit of measurement for apparent power, formally recognized by the International System of Units (SI).

It is a tiny unit, equal to exactly one-thousandth of a Volt-Ampere (0.001 VA).

Because this unit is so small, it is not used for common household appliances but is instead used to measure the power in low-energy systems.

You will typically find mVA used in specifications for:

• sensitive electronics
• small transformers
• medical devices
• precision sensors

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What Does mVA Measure? (Apparent Power vs. True Power)

The Millivolt-Ampere (mVA) is a unit of apparent power. This is the total power in an AC (alternating current) circuit.

However, it's not the same as the "true power" (measured in Watts) that actually does work, like lighting a bulb.

A simple way to understand this is the "beer analogy":

• True Power (Watts): This is the beer itself—the part you actually want that does the "work."
• Reactive Power (VAR): This is the foam on top. It's not beer, but it's still part of what's in the glass and takes up space.
• Apparent Power (VA or mVA): This is the total of the beer and the foam. It represents the full load the circuit must be able to handle.

Engineers use mVA to precisely measure this total load in very sensitive, low-power circuits.

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How to Convert Millivolt-Amperes (mVA) to Volt-Amperes (VA)

The conversion between mVA and its base unit, the Volt-Ampere (VA), is very straightforward. The prefix "milli" means "one-thousandth."

• 1 mVA = 0.001 VA
• 1,000 mVA = 1 VA

This simple 1,000-to-1 ratio makes it easy to scale measurements.

For example, a small electronic component rated at 250 mVA is drawing 0.25 VA of apparent power.