How to Convert kVA to Amps

To convert kilovolt-amperes to amps, you need to know the apparent power in kVA, the operating voltage, and whether the electrical system is single phase or three phase.

kVA represents apparent electrical power. Because the calculation starts with apparent power, power factor is not required when converting kVA directly to amps.

If you already know the current and need to calculate apparent power instead, use our

Amps to kVA Calculator
.

Single-Phase kVA to Amps Formula

For a single-phase electrical system, use:

Amps = (kVA × 1000) ÷ Volts

For example, calculate the current for a 5 kVA single-phase load operating at 230 volts:

(5 × 1000) ÷ 230 = 21.74 A

Therefore, a 5 kVA load operating at 230 volts single phase requires approximately 21.74 amps.

Three-Phase kVA to Amps Formula

For a balanced three-phase electrical system using line-to-line voltage, use:

Amps = (kVA × 1000) ÷ (√3 × Volts)

The value of √3 is approximately 1.732.

For example, calculate the current for a 10 kVA three-phase load operating at 400 volts:

(10 × 1000) ÷ (1.732 × 400) = 14.43 A

Therefore, a 10 kVA three-phase load operating at 400 volts requires approximately 14.43 amps.

kVA to Amps Conversion Table

The following table shows approximate current values for common kVA ratings at typical single-phase and three-phase voltages.

The table provides approximate values at common system voltages. Use the calculator above when you need a result for a different kVA rating or voltage.

What Is kVA?

kVA stands for kilovolt-amperes and is a unit of apparent electrical power.

One kVA is equal to 1,000 volt-amperes.

Apparent power represents the total electrical power supplied to an AC load based on voltage and current.

What Is an Amp?

An ampere, commonly called an amp and represented by A, is the unit used to measure electrical current.

Electrical current describes the flow of electric charge through a circuit. Knowing the expected current is useful when evaluating equipment, conductors, electrical panels, UPS systems, generators, transformers, and power distribution systems.

Why Is Power Factor Not Required?

Power factor is not required when converting kVA directly to amps because kVA represents apparent power rather than real power.

For single-phase systems, apparent power is based directly on voltage and current. For balanced three-phase systems using line-to-line voltage, the calculation also includes √3.

Power factor is required when converting between apparent power in kVA and real power in kW.

Single Phase vs Three Phase

Single-phase power is commonly used in homes, offices, small businesses, and equipment with moderate power requirements.

Three-phase electrical power is widely used in commercial buildings, industrial facilities, factories, data centers, large UPS systems, motors, generators, and other higher-power equipment.

For a balanced three-phase system using line-to-line voltage, the current calculation includes √3, which is approximately 1.732.

kVA to Amps vs kW to Amps

Both kVA and kW can be converted to current, but they represent different types of electrical power.

kVA represents apparent power, while kW represents real power.

Because kW represents real power, a kW to amps calculation requires power factor. A kVA to amps calculation does not require power factor.

If your equipment is rated in kilowatts instead of kVA, use our

kW to Amps Calculator
.

kVA vs kW

kVA and kW are related electrical power measurements, but they are not the same.

kVA represents apparent power, while kW represents real power.

Their general relationship is:

kW = kVA × Power Factor

If you know the electrical current and need to calculate apparent power, use our

Amps to kVA Calculator
.

Common Uses of a kVA to Amps Calculator

A kVA to amps calculator can be useful when estimating the current associated with equipment or systems rated in apparent power.

Common applications include UPS systems, generators, transformers, electrical distribution systems, switchgear, electrical panels, data centers, commercial equipment, and industrial machinery.

The calculated current should be considered together with equipment specifications and other electrical design requirements.

Frequently Asked Questions

How do I convert kVA to amps?

For single-phase power, multiply kVA by 1,000 and divide the result by voltage.

For balanced three-phase power, multiply kVA by 1,000 and divide the result by √3 multiplied by the line-to-line voltage.

How many amps is 1 kVA at 230 volts?

At 230 volts single phase, 1 kVA is approximately 4.35 amps.

How many amps is 5 kVA at 230 volts?

At 230 volts single phase, 5 kVA is approximately 21.74 amps.

How many amps is 5 kVA three phase?

At 400 volts three phase, 5 kVA is approximately 7.22 amps.

At 415 volts three phase, 5 kVA is approximately 6.96 amps.

How many amps is 10 kVA at 230 volts?

At 230 volts single phase, 10 kVA is approximately 43.48 amps.

How many amps is 10 kVA three phase?

At 400 volts three phase, 10 kVA is approximately 14.43 amps.

At 415 volts three phase, 10 kVA is approximately 13.91 amps.

How many amps is 20 kVA three phase?

At 400 volts three phase, 20 kVA is approximately 28.87 amps.

At 415 volts three phase, 20 kVA is approximately 27.82 amps.

How many amps is 50 kVA three phase?

At 400 volts three phase, 50 kVA is approximately 72.17 amps.

At 415 volts three phase, 50 kVA is approximately 69.56 amps.

How many amps is 100 kVA three phase?

At 400 volts three phase, 100 kVA is approximately 144.34 amps.

At 415 volts three phase, 100 kVA is approximately 139.12 amps.

Do I need power factor to convert kVA to amps?

No. Power factor is not required when converting apparent power in kVA directly to electrical current.

Can I use this calculator for UPS systems?

Yes. The calculator can help estimate current from a UPS kVA rating and system voltage.

Actual UPS selection should also consider real power capacity in kW, connected load, power factor, overload capability, runtime requirements, battery capacity, operating conditions, and manufacturer specifications.

Can I use this calculator for generators?

Yes. The calculator can help estimate electrical current from a generator’s kVA rating and voltage.

Generator sizing may also require consideration of real power requirements, power factor, starting currents, surge loads, load characteristics, future capacity, and manufacturer recommendations.

Can I use this calculator for transformers?

The calculator can be used to estimate full-load current from a transformer kVA rating and voltage when the correct single-phase or three-phase formula is selected.

Actual transformer applications may require additional consideration of primary and secondary voltage, loading, protection, conductor sizing, installation conditions, and manufacturer requirements.

Electrical Calculation Disclaimer

This kVA to Amps Calculator is provided for informational, educational, and preliminary planning purposes. Calculated values may be rounded.

Actual electrical installations may require consideration of equipment specifications, load characteristics, conductor ratings, protective devices, installation conditions, applicable electrical codes, manufacturer requirements, and safety factors.

Actual operating current may also differ from calculated values because of voltage variation, equipment characteristics, loading conditions, harmonics, starting current, and other operating factors.

Consult a qualified electrical professional when making final electrical installation, equipment selection, wiring, or protection decisions.