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 × 480 × 1.732 ÷ 1000 = 83.14 kVA at 480 V three-phase. To convert kVA to amps, 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. To convert kVA to amps, use 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 × 480 × 1.732 ÷ 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. To convert kVA to amps, use 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 line-to-line: 100 × 480 × 1.732 ÷ 1000 = 83.14 kVA. At 400 V 3φ ≈ 69.28 kVA. At 240 V 1φ ≈ 24 kVA.

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 converts amps to kVA. To convert kVA to amps, use 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.