Convert Apparent Power from Millivolt-Amperes to Kilovolt-Amperes (mVA to kVA)

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

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.

How many millivolt-amperes are in one kilovolt-ampere? One Kilovolt-Ampere (kVA) contains 10⁶ Millivolt-Amperes (mVA) — the inverse of the factor above. Multiplying by 10^-6 takes you from millivolt-amperes to kilovolt-amperes; multiplying by 10⁶ brings you back.

Put in words: one millivolt-ampere equals 10^-6 kilovolt-amperes, so the millivolt-ampere is the smaller unit of this pair. Converting between them never changes the amount of apparent power being measured — only the size of the unit you count it in.

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

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.

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.

What is a Kilovolt-Ampere (kVA)?

A Kilovolt-Ampere (kVA) is a unit of measurement for "apparent power."

Apparent power represents the total amount of power being used in an electrical circuit. One kVA is equal to 1,000 volt-amperes.

Think of it as the complete power load, which is why kVA is the most important measurement for correctly sizing heavy-duty electrical equipment.

Apparent power (kVA) is a combination of two distinct types of power:

1. Real Power (kW): This is the "useful" power that performs the actual work, like lighting a bulb or turning a motor.
2. Reactive Power (kVAR): This is the power required by equipment like motors and transformers to create a magnetic field, which is necessary for their operation.

How to Calculate kVA

You can calculate kVA using a simple formula.

For a single-phase circuit, which is common in most homes and small businesses, the kVA formula is:

kVA = (Voltage × Amperes) / 1000

For example, a 240-volt circuit drawing 50 amps would have an apparent power of 12 kVA.

(240 Volts × 50 Amps) / 1000 = 12 kVA

Why kVA Matters: Sizing Generators and UPS Systems

This is the most crucial part: Key equipment like generators, transformers, and Uninterruptible Power Supplies (UPS) are all rated in kVA.

This kVA rating tells you the true maximum load the equipment can safely handle.

If you only look at the real power (kW) when sizing a generator or UPS, you risk choosing a unit that is too small.

An undersized unit can overload, overheat, or fail when you need it most.

The kVA rating provides the complete power picture, ensuring your equipment can handle both the "useful" (kW) and "wasted" (kVAR) power safely.

Millivolt-Ampere to Kilovolt-Ampere Conversion Table

Here are some quick reference conversions from Millivolt-Ampere (mVA) to Kilovolt-Ampere (kVA):

This conversion in other languages

Engineering datasheets across Europe write Millivolt-Ampere to Kilovolt-Ampere several different ways. The calculation is the same in every one of them.