VA to Amps Calculator
Use this calculator to convert apparent power in Volt-Amps (VA) to current in Amperes (A), based on the voltage. This is helpful when sizing UPS systems, generators, or evaluating electrical load requirements.
What is VA to Amps Conversion?
Volt-Amps (VA) is a measure of apparent power in an electrical circuit, commonly used in AC systems such as UPSs, transformers, and generators. Amps (A), on the other hand, measure the flow of electric current. The relationship between VA and Amps depends on the voltage and power factor of the system.
Converting VA to Amps helps you size circuits correctly, match loads with UPS capacity, and ensure safe operation of electrical devices. It's especially relevant when dealing with:
- UPS and backup power sizing
- Electrical panel load calculations
- Industrial equipment and server power
- Estimating generator capacity
Formula to Convert VA to Amps
The formula is simple:
Amps = VA / Volts
Where:
- VA = Volt-Amps (apparent power)
- Volts = Voltage of the circuit (AC or DC)
Example:
If you have a 1200 VA device operating at 120V:
Amps = 1200 / 120 = 10 Amps
Why This Matters in UPS and Power Planning
Many UPS systems and power supplies are rated in VA. But most breakers, cables, and components are rated in Amps. You must convert VA to Amps to ensure:
- The wiring can safely carry the load
- The circuit breaker will support the current
- You're not overloading the power distribution system
AC vs DC Circuits
For DC circuits or purely resistive AC circuits (like heating elements), the conversion is straightforward: VA equals Watts, and Amps = Watts / Volts. But in AC systems with inductive loads (like motors), VA ≠ Watts because of power factor.
AC with Power Factor (PF)
If power factor is known:
Amps = (VA × PF) / Volts
But for basic sizing, assuming PF = 1 is common for simplicity, unless precision is required.
Common VA to Amps Conversion Chart
| VA | Voltage | Amps |
|---|---|---|
| 300 VA | 120V | 2.5 A |
| 600 VA | 120V | 5 A |
| 1000 VA | 230V | 4.35 A |
| 1500 VA | 240V | 6.25 A |
| 2000 VA | 120V | 16.67 A |
FAQs
Can I convert Amps back to VA?
Yes. Rearranged formula:
VA = Amps × Volts
Is power factor important in VA to Amps conversion?
If you need accurate real power (Watts), yes. But for basic current sizing using VA, you often assume PF = 1.
What's the difference between VA and Watts?
Watts = real power; VA = apparent power. Watts consider power factor, VA does not.
What voltage should I use?
Use the actual voltage your device operates on — common values include 120V, 208V, 230V, 240V, etc.
Conclusion
Converting VA to Amps is a critical step in electrical planning. Whether you're sizing a UPS, calculating generator load, or planning a home backup system, understanding the current draw helps ensure safety and efficiency. This calculator offers a fast, accurate way to estimate current based on apparent power and voltage, giving you the data needed to plan confidently.