How to Convert Between VAR, kVAR, and MVAR

An electrical equipment spec sheet lists reactive power in kVAR, a utility bill or power factor correction report references MVAR, and a small device’s datasheet just gives VAR directly — and comparing any of these across a project means putting them on the same scale first. Reactive power specifically shows up at wildly different magnitudes depending on context: a single capacitor bank might be rated in kVAR, while a substation’s total reactive load is more sensibly expressed in MVAR, and converting between them by hand means correctly tracking two separate factor-of-a-thousand jumps.

Getting this conversion right matters for anything involving power factor correction sizing or load balancing, where mixing up the scale of a reactive power figure leads directly to under- or over-sizing correction equipment.

What converting between VAR, kVAR, and MVAR actually involves

VAR, volt-amperes reactive, is the base unit for reactive power — the portion of AC power that oscillates between source and load without doing net work, associated with inductive or capacitive loads. kVAR is a thousand VAR, and MVAR is a thousand kVAR, or a million VAR — the same kind of scaling relationship that shows up across most electrical units, just applied to reactive power specifically. Getting the conversion right means correctly applying that factor of a thousand at each step, in the right direction depending on whether you’re converting to a larger or smaller unit. This matters practically because reactive power figures genuinely span a huge range depending on what’s being measured — a small motor’s reactive draw versus a substation’s total reactive load can differ by many orders of magnitude, and each is conventionally reported in whichever unit keeps the number in a sensible range.

Power factor correction sizing depends on getting this right specifically — undersizing correction equipment because of a unit conversion mistake leaves reactive power uncorrected, while oversizing wastes cost on unnecessary capacity.

Why people get stuck here

• Reactive power figures span a huge range depending on context. A single component’s rating and a substation’s total load can differ by orders of magnitude, and each is reported in whichever unit — VAR, kVAR, or MVAR — fits its actual scale.
• The conversion involves two separate factor-of-a-thousand steps. Going from VAR to MVAR means applying the thousand-fold scaling twice, which is easy to miscount or apply in the wrong direction under time pressure.
• Spec sheets and reports don’t consistently use the same unit. Comparing figures pulled from different sources — one in kVAR, one in MVAR — requires converting one to match the other before any real comparison is possible.
• Power factor correction sizing depends directly on getting the unit right. A scale mistake in the reactive power figure translates directly into incorrectly sized correction equipment, either under- or over-provisioned.

What a good reactive power converter looks like

Converts accurately across all three units at once

Supporting VAR, kVAR, and MVAR together, with the correct thousand-fold factor applied at each step, covers the actual range these figures show up at.

Applies the scaling correctly in both directions

Converting from a smaller to a larger unit and back again needs to apply the exact same factor consistently, without a directional mistake.

Makes cross-referencing specs from different sources straightforward

Converting instantly to whatever unit a comparison requires removes the manual recalculation that mixing sources otherwise demands.

Common mistakes to avoid

• Comparing reactive power figures from different sources without first converting them to the same unit.
• Miscounting the number of thousand-fold steps when converting between VAR and MVAR directly.
• Applying the scale factor in the wrong direction, inverting what should have been a larger or smaller result.
• Sizing power factor correction equipment based on a reactive power figure that hasn’t been correctly converted to match the rest of the calculation.

How to do it with Reactive Power Converter

Online Tool Store’s Reactive Power Converter takes a reactive power value in VAR, kVAR, or MVAR and converts it to every other unit instantly, entirely in your browser.

1. Enter your reactive power value and its unit.
2. Get it converted to every other unit instantly.
3. Use the correctly scaled figure to compare against other specs or sizing requirements.
4. Apply the accurate conversion to power factor correction or load calculations.

Because the thousand-fold scale factor is applied correctly and consistently in both directions, you get an accurate conversion without manually tracking multiple scaling steps.

Frequently asked questions

How many kVAR is 1 MVAR?

1 MVAR equals 1,000 kVAR — MVAR is a thousand times larger than kVAR, following the same scaling pattern as most electrical units.

Why do reactive power specs use different units across different documents?

Different equipment and systems operate at vastly different scales, so VAR, kVAR, and MVAR are each used wherever they keep the reported figure in a sensible, readable range for that specific context.

Why does getting this conversion right matter for power factor correction?

Correction equipment needs to be sized based on the actual reactive power figure — a unit conversion mistake directly translates into incorrectly sized correction capacity, either insufficient or unnecessarily excessive.

Final thought

Reactive power figures span a genuinely wide range, and comparing or sizing against them accurately depends on getting the unit conversion exactly right. Convert it correctly, and size your correction equipment with confidence.

Try the free Reactive Power Converter