Electrical Calculations
VA to Amps Calculator
Convert apparent power in volt-amperes to electrical current for single-phase and three-phase AC systems.
How to Convert VA to Amps
To convert volt-amperes to amps, you need to know the apparent power in VA, the operating voltage, and whether the electrical system is single phase or three phase.
VA represents apparent electrical power. Because the calculation starts with apparent power rather than real power, power factor is not required when converting VA directly to amps.
VA is closely related to kVA. One kVA is equal to 1,000 VA. If your equipment is rated in kVA instead, use our
kVA to Amps Calculator
.
Single-Phase VA to Amps Formula
For a single-phase electrical system, use:
Amps = VA ÷ Volts
For example, calculate the current for a 1,000 VA single-phase load operating at 230 volts:
1000 ÷ 230 = 4.35 A
Therefore, a 1,000 VA load operating at 230 volts single phase requires approximately 4.35 amps.
Three-Phase VA to Amps Formula
For a balanced three-phase electrical system using line-to-line voltage, use:
Amps = VA ÷ (√3 × Volts)
The value of √3 is approximately 1.732.
For example, calculate the current for a 10,000 VA three-phase load operating at 400 volts:
10000 ÷ (1.732 × 400) = 14.43 A
Therefore, a 10,000 VA three-phase load operating at 400 volts requires approximately 14.43 amps.
VA to Amps Conversion Table
The following table shows approximate current values for common VA ratings at typical single-phase and three-phase voltages.
| VA | 230V Single Phase | 400V Three Phase | 415V Three Phase |
|---|---|---|---|
| 100 VA | 0.43 A | 0.14 A | 0.14 A |
| 250 VA | 1.09 A | 0.36 A | 0.35 A |
| 500 VA | 2.17 A | 0.72 A | 0.70 A |
| 1,000 VA | 4.35 A | 1.44 A | 1.39 A |
| 2,000 VA | 8.70 A | 2.89 A | 2.78 A |
| 3,000 VA | 13.04 A | 4.33 A | 4.17 A |
| 5,000 VA | 21.74 A | 7.22 A | 6.96 A |
| 10,000 VA | 43.48 A | 14.43 A | 13.91 A |
| 20,000 VA | 86.96 A | 28.87 A | 27.82 A |
| 50,000 VA | 217.39 A | 72.17 A | 69.56 A |
These values are approximate. Use the calculator above when you need to calculate current using a different VA rating or operating voltage.
What Is VA?
VA stands for volt-amperes and is a unit of apparent electrical power.
In a single-phase AC system, apparent power can be calculated by multiplying voltage by current:
VA = Volts × Amps
For a balanced three-phase system using line-to-line voltage:
VA = √3 × Volts × Amps
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. Knowing the current associated with an apparent power rating can be useful when evaluating electrical equipment and power systems.
What Is the Difference Between VA and kVA?
VA and kVA both measure apparent electrical power. The only difference is the size of the unit.
1 kVA = 1,000 VA
For example:
500 VA = 0.5 kVA
1,000 VA = 1 kVA
5,000 VA = 5 kVA
10,000 VA = 10 kVA
Larger UPS systems, generators, transformers, and other electrical equipment are often rated in kVA rather than VA.
Why Is Power Factor Not Required?
Power factor is not required when converting VA directly to amps because VA already represents apparent electrical power.
Power factor becomes important when converting between apparent power and real power.
For example, the relationship between watts and VA in a single-phase AC system is:
Watts = VA × Power Factor
Therefore, power factor is necessary when determining real power in watts, but it is not necessary for a direct VA-to-amps calculation.
Single Phase vs Three Phase
The formula used to convert VA to amps depends on the electrical phase.
For single-phase power:
Amps = VA ÷ Volts
For balanced three-phase power using line-to-line voltage:
Amps = VA ÷ (√3 × Volts)
Three-phase systems are commonly used in commercial facilities, industrial applications, data centers, larger UPS systems, generators, transformers, motors, and other higher-power electrical installations.
VA to Amps vs Watts to Amps
VA and watts represent different types of electrical power.
VA represents apparent power, while watts represent real power.
A direct VA-to-amps calculation does not require power factor. An AC watts-to-amps calculation does require power factor because watts represent the real portion of electrical power.
If your equipment is rated in watts rather than VA, use our
Watts to Amps Calculator
.
Common Uses of a VA to Amps Calculator
A VA to amps calculator can be useful when estimating current from an apparent power rating.
Common applications include UPS systems, transformers, power supplies, generators, inverters, voltage regulators, electrical distribution equipment, IT equipment, data center equipment, and other AC electrical loads.
For example, smaller UPS systems and power supplies may display their capacity in VA, while larger equipment is often rated in kVA.
The calculated current should be considered together with equipment specifications, operating conditions, and other electrical design requirements.
Frequently Asked Questions
How do I convert VA to amps?
For single-phase power, divide VA by voltage.
For balanced three-phase power, divide VA by √3 multiplied by the line-to-line voltage.
How many amps is 100 VA at 230 volts?
At 230 volts single phase, 100 VA is approximately 0.43 amps.
How many amps is 500 VA at 230 volts?
At 230 volts single phase, 500 VA is approximately 2.17 amps.
How many amps is 1,000 VA at 230 volts?
At 230 volts single phase, 1,000 VA is approximately 4.35 amps.
How many amps is 2,000 VA at 230 volts?
At 230 volts single phase, 2,000 VA is approximately 8.70 amps.
How many amps is 5,000 VA at 230 volts?
At 230 volts single phase, 5,000 VA is approximately 21.74 amps.
How many amps is 5,000 VA three phase?
At 400 volts three phase, 5,000 VA is approximately 7.22 amps.
At 415 volts three phase, 5,000 VA is approximately 6.96 amps.
How many amps is 10,000 VA three phase?
At 400 volts three phase, 10,000 VA is approximately 14.43 amps.
At 415 volts three phase, 10,000 VA is approximately 13.91 amps.
Is 1,000 VA the same as 1 kVA?
Yes. One kilovolt-ampere is equal to 1,000 volt-amperes, so 1,000 VA is exactly 1 kVA.
Is VA the same as watts?
Not necessarily. VA measures apparent power, while watts measure real power.
They have the same numerical value only under conditions where the power factor is 1.
Do I need power factor to convert VA to amps?
No. Power factor is not required for a direct conversion from apparent power in VA to current.
Can I use this calculator for a UPS?
Yes. Many UPS systems are rated in VA or kVA, so the calculator can help estimate current from the UPS apparent power rating and voltage.
UPS selection should also consider the UPS real power rating in watts or kW, connected load, power factor, runtime requirements, battery capacity, overload capability, and manufacturer specifications.
Can I use this calculator for transformers?
The calculator can help estimate current from a transformer VA rating when the appropriate voltage and phase are known.
Actual transformer applications may require additional consideration of primary and secondary voltages, conductor sizing, protection, loading, installation conditions, and manufacturer requirements.
Related Electrical Calculators
Continue your electrical calculations with these related tools:
Electrical Calculation Disclaimer
This VA to Amps Calculator is provided for informational, educational, and preliminary planning purposes. Calculated values may be rounded.
Actual electrical current 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.
