kVA to Amps Calculator

Q: What is kVA to amps and why is it important?

kVA to amps conversion turns apparent power into current for practical design tasks such as breaker and cable sizing.

Q: How to calculate amps from kVA for three-phase systems?

The formula is I = (kVA × 1000) / (1.732 × V). Where I is Amps, V is Line-to-Line Voltage.

Q: What is the formula for single-phase kVA to amps?

Single-phase formula is I = (kVA × 1000) / V.

Q: Can you give an example of kVA to amps conversion?

Example: 10 kVA at 400 V three-phase gives current of about 14.43 A.

Convert kilovolt-amps (kVA) to amperes (A) instantly. This calculator supports both single-phase and three-phase electrical systems, essential for sizing circuit breakers and cables.

For more focused calculations, use our 3-phase kVA to amps calculator or single-phase kVA to amps calculator.

For detailed guides and examples, see our kW to kVA Formula Guide

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Coming from power calculations?

Start with apparent power first:

kW → kVA → kVA → Amps

Input Parameters

Apparent Power (kVA) Apparent power in kilovolt-amperes

Voltage (V) Line-to-line voltage (RMS). For single-phase use line-to-neutral or line voltage as applicable.

Phase

Single Phase Three Phase

Single-phase and three-phase use different current formulas.

Calculation Results

⚠️ Professional Disclaimer: This calculator provides preliminary current estimation only. Final breaker, cable, and protection design must be validated with applicable standards, equipment data, and engineering review.

Why this result? (Optional)

Calculation Insights

How to Calculate Amps from kVA

Single Phase Formula:

I_(A) = S_(kVA) × 1000 / V_(V)

Three Phase Formula:

I_(A) = S_(kVA) × 1000 / (sqrt(3) × V_(V)) = S_(kVA) × 1000 / (1.73205 × V_(V))

Where I is current in amperes, S is apparent power in kVA, and V is line-to-line voltage in volts. This is commonly used before breaker sizing, cable sizing, and transformer feeder checks in industrial electrical design.

Typical Examples

Example 1: Convert a 50 kVA, 400 V three-phase load to estimate feeder current before breaker selection.
Example 2: Convert a 10 kVA, 230 V single-phase load for branch circuit cable planning.
Example 3: Convert 200 kVA at 480 V to validate upstream protection and transformer interface current.

Common kVA to Amps Conversion Table (at 400V, 3-Phase)

kVA	Amps
1	1.44
5	7.22
10	14.43
50	72.17
100	144.34

Values calculated with I = kVA × 1000 / (sqrt(3) × 400).

Frequently Asked Questions

What is kVA to amps and why is it important?

kVA to amps conversion turns apparent power into current, which is needed to size breakers, cables, and switchgear in practical electrical design.

How to calculate amps from kVA for three-phase systems?

Use the formula: I = (kVA × 1000) / (1.732 × V). Use line-to-line voltage for three-phase systems.

What is the formula for single-phase kVA to amps?

The formula is I = (kVA × 1000) / V. This gives line current for single-phase loads.

Can you give an example of kVA to amps conversion?

Example: 10 kVA at 400 V three-phase gives I = (10 × 1000) / (1.732 × 400) ≈ 14.43 A.

What voltage should I use in the formula?

For single-phase, use the actual load voltage. For three-phase, use line-to-line voltage such as 400 V or 480 V.

How to use this result in engineering workflow?

After current is calculated, proceed to breaker sizing, then cable sizing, and then transformer or generator sizing as needed.

Related Tools

For detailed guides and examples, see our kW to kVA Formula Guide.