VA & Amps Converter
* Note: For three-phase calculations, Line-to-Line voltage is assumed. The formula used is VA = Amps × Volts × √3.
The VA & Amps Converter on Calqro gives you instant, accurate electrical conversions. Enter your apparent power and voltage — and get your current in amps in seconds.
Understanding the VA to Amps Calculator
Electrical work moves fast. Calculating current by hand slows everything down.
When you’re sizing a circuit breaker or specifying a UPS unit, a wrong calculation is costly. It can mean tripped breakers, damaged equipment, or a failed inspection.
This free VA to amps calculator removes that risk entirely. It handles the formula automatically — so you get the right number every time.
Why does this matter in real life?
- An electrician sizing a 5,000 VA generator at 240V needs the amp draw immediately.
- A data center engineer converting kVA to amps for a server rack has zero margin for error.
- A homeowner picking a transfer switch needs to know if their 15-amp circuit can handle the load.
This tool solves all of these problems in under 10 seconds.
Key Features & Capabilities
The VA & Amps Converter is built for speed, accuracy, and real-world electrical work. Here’s what makes it stand out:
- Dual conversion modes: Switch instantly between VA to Amps and Amps to VA with one click.
- Single-phase and three-phase support: Select your circuit type from the Phase dropdown. The tool automatically applies the correct formula for each.
- VA or kVA input: Enter apparent power in VA or kVA — the unit dropdown handles both.
- Voltage unit flexibility: Input voltage in volts directly — no extra steps.
- Live result display: Your current in amps (or apparent power in VA) appears instantly in the result box below.
- Three-phase formula transparency: A clear formula note —
VA = Amps × Volts × √3— is shown directly on the tool for full transparency. - Zero sign-up required: This is a fully free, online conversion calculator. No account. No ads. No friction.
How to Use the VA & Amps Converter (Step-by-Step)
The tool has two conversion modes. Here’s exactly how to use each one.
▶ VA to Amps Conversion
- Click the “VA to Amps” tab at the top of the tool. This tab is active by default.
- Select your Phase from the dropdown. Choose Single-phase or Three-phase.
- Enter your Apparent Power in the input field. Use the unit dropdown next to it to select VA or kVA.
- Enter your Voltage in the Voltage field. The unit is set to volts by default.
- Read your result. The Current box at the bottom instantly displays your answer in Amps.
▶ Amps to VA Conversion
- Click the “Amps to VA” tab at the top of the tool.
- Select your Phase from the Phase dropdown — Single-phase or Three-phase.
- Enter your Current in the input field. The unit is set to amps by default.
- Enter your Voltage in the Voltage field (in volts).
- Read your result. The Apparent Power box instantly shows your answer in VA.
✅ Tip: For three-phase calculations, the tool assumes Line-to-Line voltage. The formula used is
VA = Amps × Volts × √3.
VA & Amps Quick Reference Table
Use this table for fast, everyday electrical conversions. All values use the standard single-phase formula: Amps = VA ÷ Volts.
| Apparent Power (VA) | Voltage (V) | Current (Amps) | Common Use Case |
|---|---|---|---|
| 500 VA | 120 V | 4.17 A | Small UPS unit |
| 1,000 VA | 120 V | 8.33 A | Home office equipment |
| 1,500 VA | 240 V | 6.25 A | Residential appliance |
| 3,000 VA | 240 V | 12.50 A | HVAC or workshop circuit |
| 5,000 VA | 240 V | 20.83 A | Small generator output |
| 10,000 VA (10 kVA) | 480 V | 20.83 A | Commercial three-phase load |
📌 Three-phase formula:
Amps = VA ÷ (Volts × √3)— where √3 ≈ 1.732
Accuracy & Privacy Guarantee
This tool is 100% free. No subscription. No hidden fees.
Every calculation uses the standard electrical engineering formulas — the same ones used by licensed electricians and engineers worldwide. The single-phase and three-phase formulas are both applied correctly based on your selected phase type.
Your data never leaves your device. All conversions run directly in your browser. We don’t store, log, or transmit any values you enter. Your electrical data stays private.
FREQUENTLY ASKED QUESTIONS (FAQ)
What is the formula to convert VA to amps?
For a single-phase circuit, the current in amps equals the apparent power in volt-amps divided by the voltage in volts. For three-phase circuits, divide the apparent power by the voltage multiplied by the square root of 3 (approximately 1.732). This tool applies the correct formula automatically based on your selected phase type.
Can this calculator convert kVA to amps as well?
Yes, this VA to amps calculator accepts both VA and kVA as input units via the dropdown next to the Apparent Power field. Simply enter your value and select kVA — the tool handles the conversion internally and returns your result in amps instantly.
What is the difference between single-phase and three-phase calculations?
Single-phase amps is equal to the apparent power divided by the voltage, while three-phase amps uses a line-to-line voltage multiplied by √3 in the denominator. Three-phase circuits are common in commercial and industrial electrical systems. This tool supports both, so you always get the right result for your circuit type.
Does the Amps to VA tab use the same formulas in reverse?
Yes, the Amps to VA calculator reverses the same standard electrical formulas — multiplying current by voltage for single-phase, and multiplying amps by voltage and √3 for three-phase. The result is displayed instantly as apparent power in VA, making it easy to rate electrical devices and size circuits correctly.