CalcPanel

Amps to kVA Calculator

Convert amps to kVA from line current, voltage, and phase—instant apparent power for generators, feeders, and transformers.

Formula: 1φ kVA = I × V ÷ 1000 · 3φ L-L kVA = √3 × I × V ÷ 1000. Example: 100 A @ 480 V 3φ ≈ 83.1 kVA. Need the reverse? Use kVA to Amps.

Calculator

Enter amps, voltage, and phase. Result updates instantly. PF is not required for amps → kVA.

Example: 100 A measured feeder or breaker continuous load.
Three-phase default uses line-to-line RMS voltage.
Advanced settings ▾
Only applies to three-phase. Most nameplates and distribution voltages are L-L.

About this calculator

This amps to kVA calculator converts line current to apparent power. It is the reverse of kVA to Amps. After you have kVA, continue to breaker/cable sizing or browse the power calculator hub.

Calculation Results

≈ 83.14 kVA apparent power

100 A · 480 V · 3-phase · V_L-L

Formula: kVA = √3 × I × V_L-L ÷ 1000

At PF 1.0 (apparent = real — not for motors/UPS with lagging PF):

  • 83,138 W · 83.14 kW
  • 83,138 VA · 111.44 HP (electrical, ÷0.746)

Need real kW at actual PF? Use Amps to kW.

Balanced RMS estimate. Harmonics, continuous-load margins, and OEM derates are not applied—use results for screening, then verify with engineering judgment.

Continue Your Calculation

Have apparent power from amps? Cross-check line current on kVA to Amps, or continue to breaker sizing.

kVA to Amps →

Amps to kVA conversion charts

Quick-reference tables matching common US/EU voltages. Click an amps button to load the calculator (1φ presets use 240 V; 3φ presets use 480 V).

Single-phase — kVA = I × V ÷ 1000

Amps120 V208 V220 V240 V277 V480 V
1.22.082.22.42.774.8
1.83.123.33.64.167.2
2.44.164.44.85.549.6
3.66.246.67.28.3114.4
4.88.328.89.611.0819.2
610.4111213.8524
7.212.4813.214.416.6228.8
9.616.6417.619.222.1638.4
1220.8222427.748
1831.2333641.5572
2441.6444855.496
4883.28896110.8192

Three-phase (L-L) — kVA = √3 × I × V ÷ 1000

Amps208 V220 V380 V400 V415 V480 V
3.63.816.586.937.198.31
5.45.729.8710.3910.7812.47
7.217.6213.1613.8614.3816.63
10.8111.4319.7520.7821.5624.94
14.4115.2426.3327.7128.7533.26
18.0119.0532.9134.6435.9441.57
21.6222.8639.4941.5743.1349.88
28.8230.4852.6555.4357.566.51
36.0338.1165.8269.2871.8883.14
54.0457.1698.73103.92107.82124.71
72.0576.21131.64138.56143.76166.28
144.11152.42263.27277.13287.52332.55

Values in kVA. For line-to-neutral three-phase, open Advanced and select V_L-N (×3 formula).

Amps to kVA formula

Single-phase: kVA = I × V ÷ 1000

Three-phase (line-to-line): kVA = √3 × I × V_L-L ÷ 1000

Three-phase (line-to-neutral): kVA = 3 × I × V_L-N ÷ 1000

  • I — balanced RMS line current (amps)
  • V — RMS voltage matching the formula basis (L-L or L-N)
  • PF not required for kVA — use Amps to kW for real power at actual PF

Excel / Sheets formulas

Put amps in A2 and volts in B2:

  • Single-phase: =(A2*B2)/1000
  • Three-phase L-L: =(SQRT(3)*A2*B2)/1000
  • Three-phase L-N: =(3*A2*B2)/1000

DC note (not this calculator’s default)

For DC, apparent power collapses to kVA = I × V ÷ 1000 (same as single-phase AC). This page defaults to AC 1φ/3φ. Prefer DC-specific tooling when sizing battery buses.

Example 1: 100 A × 480 V × √3 ÷ 1000 = 83.14 kVA (3φ L-L).

Example 2: 60 A × 240 V ÷ 1000 = 14.4 kVA (1φ) → @PF 1.0 ≈ 14.4 kW / 19.3 HP.

Example 3: 200 A × 400 V × √3 ÷ 1000 = 138.56 kVA (3φ L-L)—next screen a breaker on Breaker Size or a set on Generator Size.

Worked 3-phase examples: 3-phase power formula examples. Reverse direction: kVA to Amps.

When to use which tool

Goal Tool
Convert amps → kVA (this page)Amps to kVA
Convert kVA → line ampskVA to Amps
Convert amps → kW (needs PF)Amps to kW
Generator kVA from loadGenerator Size
Screen breaker / cable from ampsBreaker Size · Cable Size

Typical uses: generator kVA from measured feeder amps, transformer apparent-power screening, UPS/inverter kVA from AC current, and distribution planning before breaker/cable selection.

Frequently Asked Questions

How do I convert amps to kVA for a three-phase system?

Use kVA = √3 × I × V ÷ 1000 with line-to-line voltage. Example: 100 A @ 400 V ≈ 69.28 kVA. For L-N voltage, open Advanced and use kVA = 3 × I × V_L-N ÷ 1000.

What is 100 amps to kVA?

At 480 V 3φ ≈ 83.14 kVA. At 400 V 3φ ≈ 69.28 kVA. At 240 V 1φ ≈ 24 kVA. Use the 100 A chart row or presets.

Do I need power factor to convert amps to kVA?

No for kVA. The W / kW / HP figures shown under the result assume PF 1.0 only. For real kW at a known PF, use Amps to kW.

How do I calculate amps to kVA in Excel?

1φ: =(A2*B2)/1000. 3φ L-L: =(SQRT(3)*A2*B2)/1000. 3φ L-N: =(3*A2*B2)/1000 (amps in A2, volts in B2).

How is amps to kVA different from kVA to amps?

This page is amps → kVA. Reverse conversion is on kVA to Amps.

Is amps to kvar the same as amps to kVA?

No. kVAR is reactive power. Use a power-triangle / PF tool when you need kVAR—not this converter.