kVA to Amps Calculator

Convert kilovolt-amps (kVA) to amps for single-phase and three-phase circuits. Essential for generator sizing, transformer selection, and electrical panel capacity planning.

kVA
V

CURRENT

113.64 A

PHASE

Single-Phase

FORMULA

I = (kVAΓ—1000)/V

kVA INPUT

25 kVA

kVA to Amps β€” Conversion Table (Single-Phase)

kVA120V208V220V240V480V
5 kVA41.67 A24.04 A22.73 A20.83 A10.42 A
10 kVA83.33 A48.08 A45.45 A41.67 A20.83 A
15 kVA125 A72.12 A68.18 A62.5 A31.25 A
20 kVA166.67 A96.15 A90.91 A83.33 A41.67 A
25 kVA208.33 A120.19 A113.64 A104.17 A52.08 A
30 kVA250 A144.23 A136.36 A125 A62.5 A
50 kVA416.67 A240.38 A227.27 A208.33 A104.17 A
75 kVA625 A360.58 A340.91 A312.5 A156.25 A
100 kVA833.33 A480.77 A454.55 A416.67 A208.33 A
150 kVA1,250 A721.15 A681.82 A625 A312.5 A
200 kVA1,666.67 A961.54 A909.09 A833.33 A416.67 A
250 kVA2,083.33 A1,201.92 A1,136.36 A1,041.67 A520.83 A

πŸ’‘ How to Convert kVA to Amps

Kilovolt-amps (kVA) is a measure of apparent power β€” the total power flowing in an AC circuit, including both the useful (real) power and the reactive power. Converting kVA to amps is essential for sizing generators, transformers, and electrical panels.

kVA to Amps Formula

Single-Phase: I = (kVA Γ— 1,000) / V
Three-Phase: I = (kVA Γ— 1,000) / (V Γ— √3)

Where I is current (amps), kVA is apparent power (kilovolt-amps), V is voltage (volts).

Example: 25 kVA Transformer (Single-Phase)

At 240V single-phase:
I = (25 Γ— 1,000) / 240 = 104.2 amps

A 25 kVA single-phase transformer at 240V can supply 104.2 amps.

Example: 100 kVA Three-Phase Generator at 208V

I = (100 Γ— 1,000) / (208 Γ— √3) = (100,000) / (360.2) = 277.6 amps

A 100 kVA three-phase generator at 208V can supply 277.6 amps per line.

Common Generator Sizes β€” kVA to Amps

Generator (kVA)120V 1Ξ¦ Amps240V 1Ξ¦ Amps208V 3Ξ¦ Amps480V 3Ξ¦ Amps
10 kVA83.3 A41.7 A27.8 A12.0 A
25 kVA208.3 A104.2 A69.4 A30.1 A
50 kVA416.7 A208.3 A138.8 A60.1 A
100 kVA833.3 A416.7 A277.6 A120.3 A
200 kVA1,666.7 A833.3 A555.1 A240.6 A

kVA vs. kW β€” What's the Difference?

kVA (kilovolt-amps) measures apparent power, while kW (kilowatts) measures real power. The relationship is:

kW = kVA Γ— PF

Example: A 100 kVA generator with PF = 0.8 delivers 80 kW of real power.

Generators and transformers are rated in kVA because they must handle the total apparent power, regardless of load power factor.

References

  • NFPA 70 β€” National Electrical Code (NEC), 2023 Edition
  • IEEE Standard 141 (Red Book) β€” Electric Power Distribution
  • Electrical Wiring: Residential β€” Ray Mullin, 20th Edition
A 25 kVA transformer at 240V single-phase supplies 104.2 amps. For three-phase at 208V, the same 25 kVA supplies 69.4 amps per line.

kVA to Amps Calculator FAQ

πŸ”— Related Calculators

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