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Multiple conversions
To convert from Kilovolt-Ampere (kVA) to Volt-Ampere (VA), use the following formula:
Volt-Ampere (VA)
= 1000× Kilovolt-Ampere (kVA)
To convert from Kilovolt-Ampere (kVA) to Millivolt-Ampere (mVA), use the following formula:
Millivolt-Ampere (mVA)
= 1000 × 1000× Kilovolt-Ampere (kVA)
= 106× Kilovolt-Ampere (kVA)
To convert apparent power from kilovolt-amperes (kVA) to megavolt-amperes (MVA), divide by 1,000.
The mega prefix is one thousand times the kilo prefix, so the conversion is an exact three-place decimal shift. Multiply by 1,000 to go from MVA back to kVA.
A campus expansion adds loads totalling 3,750 kVA, and the utility's interconnection application form asks for the request in MVA:
The request is therefore filed as 3.75 MVA — which also signals immediately that a single 2.5 MVA pad-mount transformer will not cover it.
| kVA | MVA |
|---|---|
| 500 | 0.5 |
| 1,000 | 1 |
| 2,500 | 2.5 |
| 5,000 | 5 |
| 10,000 | 10 |
| 75,000 | 75 |
The two units mark a real boundary in the electrical world, not just a notation change. Equipment on the distribution side — pad-mount and pole-top transformers, standby generator sets, UPS systems — carries nameplates in kVA, typically 25 to 2,500 kVA. Everything on the transmission and utility side — substation power transformers, grid interconnection agreements, generating units, short-circuit levels — is discussed in MVA. Engineers cross the boundary whenever a facility grows large enough to negotiate with the utility: load studies built up from kVA nameplates must be summed and restated in MVA for the interconnection request, and a substation's 40 MVA transformer must be decomposed back into kVA when checking which feeders it can serve. Note that kVA and MVA are apparent power — the product of voltage and current regardless of phase angle — so they convert to real kilowatts or megawatts only after multiplying by the power factor. A 2 MVA generator at 0.8 power factor delivers at most 1.6 MW; the ÷1,000 between kVA and MVA, by contrast, is exact and carries no such condition.
To convert from Kilovolt-Ampere (kVA) to Gigavolt-Ampere (GVA), use the following formula:
Gigavolt-Ampere (GVA)
= 1000 × 1109× Kilovolt-Ampere (kVA)
= 1106× Kilovolt-Ampere (kVA)
= 10-6× 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:
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
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.