How to Convert Amps to VA

To convert amps to volt-amperes, you need to know the electrical current, operating voltage, and whether the electrical system is single phase or three phase.

VA represents apparent electrical power. Because this calculation determines apparent power directly from current and voltage, power factor is not required.

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

VA to Amps Calculator
.

Single-Phase Amps to VA Formula

For a single-phase electrical system, use:

VA = Amps × Volts

For example, calculate the apparent power of a 10 amp single-phase load operating at 230 volts:

10 × 230 = 2,300 VA

Therefore, 10 amps at 230 volts single phase represents 2,300 VA of apparent power.

Three-Phase Amps to VA Formula

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

VA = √3 × Amps × Volts

The value of √3 is approximately 1.732.

For example, calculate the apparent power of a 10 amp three-phase load operating at 400 volts:

1.732 × 10 × 400 = 6,928 VA

Therefore, 10 amps at 400 volts three phase represents approximately 6,928 VA of apparent power.

Amps to VA Conversion Table

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

These values are approximate. Use the calculator above when you need to calculate apparent power using a different current or operating voltage.

What Is an Amp?

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

Current describes the flow of electric charge through an electrical circuit.

When current and voltage are known, they can be used to determine the apparent power of an AC electrical system.

What Is VA?

VA stands for volt-amperes and is a unit of apparent electrical power.

Apparent power represents the combined effect of voltage and current in an AC electrical system.

For single-phase power:

VA = Volts × Amps

For balanced three-phase power using line-to-line voltage:

VA = √3 × Volts × Amps

What Is the Difference Between VA and kVA?

VA and kVA both measure apparent electrical power. The difference is the size of the unit.

1 kVA = 1,000 VA

For example:

1,000 VA = 1 kVA

5,000 VA = 5 kVA

10,000 VA = 10 kVA

Smaller UPS systems, power supplies, and electrical equipment may be rated in VA, while larger UPS systems, generators, transformers, and electrical equipment are commonly rated in kVA.

Why Is Power Factor Not Required?

Power factor is not required for a direct amps-to-VA calculation because VA measures apparent power.

The calculation uses current and voltage directly to determine apparent power.

Power factor becomes necessary when calculating real power in watts or kilowatts from AC current.

For example, single-phase real power is calculated as:

Watts = Amps × Volts × Power Factor

If you want to calculate real power instead of apparent power, use our

Amps to Watts Calculator
.

Single Phase vs Three Phase

The formula used to convert amps to VA depends on whether the electrical system is single phase or three phase.

For single-phase power:

VA = Amps × Volts

For balanced three-phase power using line-to-line voltage:

VA = √3 × Amps × Volts

The value of √3 is approximately 1.732.

Three-phase electrical systems are commonly used for larger commercial and industrial loads, data centers, motors, pumps, HVAC systems, UPS systems, generators, transformers, and other higher-power applications.

Amps to VA vs Amps to Watts

Amps to VA and amps to watts are related calculations, but they measure different types of electrical power.

VA represents apparent power, while watts represent real power.

For a single-phase AC system:

VA = Amps × Volts

Watts = Amps × Volts × Power Factor

This is why power factor is required when converting amps to watts but is not required when converting amps directly to VA.

Amps to VA vs Amps to kVA

Amps to VA and amps to kVA calculate the same type of electrical power. The difference is the unit used for the result.

VA is convenient for smaller apparent power values, while kVA is more convenient for larger values.

For example, 10 amps at 230 volts single phase is:

10 × 230 = 2,300 VA

The same value expressed in kVA is:

2,300 ÷ 1,000 = 2.3 kVA

For larger electrical loads, you can use our

Amps to kVA Calculator
.

Common Uses of an Amps to VA Calculator

An amps to VA calculator can be useful when estimating apparent electrical power from a known current and voltage.

Common applications include UPS systems, transformers, generators, power supplies, inverters, voltage regulators, electrical distribution equipment, IT equipment, data center equipment, and other AC electrical loads.

The result can also help when comparing equipment current requirements with VA or kVA capacity ratings.

Calculated values should be considered together with actual equipment specifications, operating conditions, and electrical system requirements.

Frequently Asked Questions

How do I convert amps to VA?

For single-phase power, multiply amps by voltage.

For balanced three-phase power using line-to-line voltage, multiply √3 by amps and voltage.

How many VA is 1 amp at 230 volts?

At 230 volts single phase, 1 amp is equal to 230 VA.

How many VA is 5 amps at 230 volts?

At 230 volts single phase, 5 amps is equal to 1,150 VA.

How many VA is 10 amps at 230 volts?

At 230 volts single phase, 10 amps is equal to 2,300 VA.

How many VA is 20 amps at 230 volts?

At 230 volts single phase, 20 amps is equal to 4,600 VA.

How many VA is 50 amps at 230 volts?

At 230 volts single phase, 50 amps is equal to 11,500 VA.

How many VA is 10 amps three phase?

At 400 volts three phase, 10 amps is approximately 6,928 VA.

At 415 volts three phase, 10 amps is approximately 7,188 VA.

How many VA is 20 amps three phase?

At 400 volts three phase, 20 amps is approximately 13,856 VA.

At 415 volts three phase, 20 amps is approximately 14,376 VA.

How many VA is 100 amps three phase?

At 400 volts three phase, 100 amps is approximately 69,282 VA.

At 415 volts three phase, 100 amps is approximately 71,880 VA.

Is 1,000 VA equal to 1 kVA?

Yes. One kVA is exactly equal to 1,000 VA.

Is VA the same as watts?

Not necessarily. VA measures apparent power, while watts measure real power.

Their numerical values are equal when the power factor is 1. At a power factor below 1, the real power in watts is lower than the apparent power in VA.

Do I need power factor to calculate VA from amps?

No. A direct amps-to-VA calculation does not require power factor.

Can I use this calculator for a UPS?

Yes. The calculator can help estimate apparent power from the current and voltage of a UPS load or electrical system.

UPS selection should also consider the UPS watt rating, connected load, load power factor, runtime requirements, battery capacity, overload capability, and manufacturer specifications.

Can I use this calculator for transformers?

Yes. The calculator can help estimate apparent power when transformer current, voltage, and phase are known.

Actual transformer selection and installation may require additional consideration of primary and secondary voltages, loading, protection, conductor sizing, installation conditions, and manufacturer specifications.

Electrical Calculation Disclaimer

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

Actual electrical conditions may vary because of voltage variation, equipment characteristics, load conditions, harmonics, starting current, operating conditions, and other factors.

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

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