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Amps to VA Calculator

Enter the current in amps (A) and voltage in volts (V), then press the Calculate button to get the result in volt-amps (VA). Supports both single-phase and three-phase electrical systems.

⚠ Please enter valid positive numbers for current and voltage.
Apparent Power (VA)
0 VA

How to Use This Amps to VA Calculator

This free Amps to VA Calculator from checkbillonline.com makes it simple and fast to convert electrical current (amperes) to apparent power (volt-amperes) for any electrical circuit — whether residential, commercial, or industrial. Unlike manually applying the formula, this tool handles all the math instantly so you avoid errors and save time.

It supports two common circuit configurations: Single Phase (common in homes and small offices) and Three Phase (used in industrial and large commercial setups). The calculator automatically applies the correct formula based on your selection, so you always get an accurate result without needing to remember which equation to use.

Use this tool when sizing UPS systems, generators, transformers, circuit breakers, inverters, or any other electrical equipment rated in VA or kVA. It is ideal for electricians, engineers, students, and homeowners managing their electrical systems.

  1. Choose Single Phase or Three Phase from the dropdown menu.
  2. Enter the value of current in the Current (A) field.
  3. Enter the voltage in the Line to Line Voltage (V) field.
  4. Click the Calculate button to instantly see the result in volt-amps (VA).
  5. To start a new calculation, click Reset to clear all fields.
Note: This calculator assumes a power factor of 1 (i.e., no reactive power component). For circuits with motors, capacitors, or inductive loads, the actual apparent power may differ. Always enter valid, positive numbers — invalid entries will trigger an error message.

Formulas Used

Single-Phase Formula: The apparent power S in volt-amps equals the current I in amps multiplied by the voltage V in volts.

S(VA) = I(A) × V(V)

Example: A circuit with 5A current and 230V voltage → S = 5 × 230 = 1,150 VA

Three-Phase Formula: The apparent power S equals the square root of 3 multiplied by the line-to-line voltage and current.

S(VA) = √3 × I(A) × VL-L(V)

Example: A 400V three-phase circuit with 50A → S = 1.732 × 50 × 400 = 34,641 VA

Amps to VA Conversion Table (230V Single Phase)

Current (A)Volts-Amps (VA)
0.0010.23
0.012.3
0.123
1230
2460
3690
4920
51,150
61,380
71,610
81,840
92,070
102,300
204,600
306,900
409,200
5011,500
6013,800
7016,100
8018,400
9020,700
10023,000

Table 1 – Amps to VA conversion table for a 230V single-phase electrical system

Amps to VA Conversion Table (400V Three Phase)

Current (A)Volts-Amps (VA)
0.0010.69
0.016.93
0.169.3
1692.8
21,385.6
32,078.5
42,771.3
53,464.1
64,156.9
74,849.7
85,542.6
96,235.4
106,928.2
2013,856.4
3020,784.6
4027,712.8
5034,641.0
6041,569.2
7048,497.4
8055,425.6
9062,353.8
10069,282.0

Table 2 – Amps to VA conversion table for a 400V three-phase electrical system (S = √3 × I × V)

Frequently Asked Questions (FAQs)

What is the difference between VA and Watts?▾
Watts (W) measure real power — the actual energy consumed. VA (volt-amps) measures apparent power — the product of voltage and current without accounting for phase difference. In a purely resistive circuit (power factor = 1), they are equal. In inductive or capacitive circuits, Watts will be less than VA.
How do I convert amps to VA for a single-phase system?▾
Simply multiply the current in amps (A) by the voltage in volts (V). For example, 10A at 230V gives 10 × 230 = 2,300 VA. You can use the calculator above to do this instantly.
How do I convert amps to VA for a three-phase system?▾
For three-phase circuits, use: S = √3 × I × V (line-to-line). The √3 factor (approximately 1.732) accounts for the three-phase power distribution. Example: 20A at 400V → S = 1.732 × 20 × 400 = 13,856 VA.
Why does this calculator use a power factor of 1?▾
A power factor of 1 (unity) is the default assumption because it simplifies the calculation to pure apparent power. In many general-use scenarios (like sizing UPS, generators, or transformers), VA is the primary concern. If your load has a known power factor (e.g., 0.8), multiply the VA result by your power factor to get actual watts.
What is the common use of VA ratings?▾
VA ratings are commonly used for UPS systems, voltage stabilizers, inverters, transformers, and generators. These devices are rated in VA or kVA (kilovolt-amps) to indicate their maximum load capacity regardless of the power factor of the connected devices.
How do I convert VA to kVA?▾
Simply divide the VA value by 1,000. For example, 5,000 VA = 5 kVA. Most industrial equipment and large generators are rated in kVA for convenience.
Can I use this calculator for UPS sizing?▾
Yes. To size a UPS, calculate the total VA load of all connected devices. For safety, add a 20–25% buffer above the calculated VA to handle startup surges and future load growth. Example: if your load is 800 VA, choose a UPS rated at least 1,000 VA.
What voltage should I enter for Pakistan (230V or 220V)?▾
In Pakistan, the standard household voltage is 230V at 50Hz (single phase). For three-phase systems, the line-to-line voltage is typically 400V. Enter the actual voltage shown on your meter or equipment nameplate for the most accurate result.

About The Author

CB

CheckBillOnline Team

Electrical Tools & Bill Calculation Experts · checkbillonline.com

The team at checkbillonline.com specializes in creating free, accurate, and easy-to-use electrical calculation tools for consumers, homeowners, electricians, and engineers. Our goal is to simplify complex electrical and billing calculations into tools anyone can use — without needing a technical background. All tools are built with verified formulas and tested for accuracy. We are committed to helping you understand and manage your electrical usage better.

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