kVA to Amps Calculator
Convert apparent power (kilovolt-amperes) and voltage to line current in amps for DC, single-phase AC, and balanced three-phase AC (line-to-line). Power factor is not required — kVA is already apparent power. All calculations run in your browser.
Nameplate kVA (1 kVA = 1,000 VA). Used for transformers, generators, and UPS AC output ratings.
RMS voltage (e.g. 120 V or 230 V).
All calculations run in your browser. No data is sent to a server.
Table of Contents
Why kVA maps to amps
kVA (kilovolt-amperes) is apparent power: the product of voltage and current magnitudes (with AC phase conventions accounted for in the formulas below). Equipment such as transformers, generators, and UPS units are often rated in kVA because they must deliver current regardless of load power factor.
To find line current from kVA and voltage, convert to volt-amperes first: S (VA) = kVA × 1,000.
Single-phase AC: I = S ÷ VRMS. Balanced three-phase (line-to-line): I = S ÷ (√3 × VL-L).
This differs from kW to amps: real power in watts needs power factor on AC. Here you already entered apparent power in kVA, so PF is not part of the kVA→amps conversion.
Formulas
DC (magnitude)
I (A) = (kVA × 1,000) ÷ V (V)
DC systems rarely quote kVA; numerically this is the same as I = P ÷ V when apparent and real power coincide.
AC single-phase
I (A) = (kVA × 1,000) ÷ VRMS
VRMS is the RMS voltage across the load (outlet / nameplate rating).
AC three-phase (balanced)
I (A) = (kVA × 1,000) ÷ (√3 × VL-L)
VL-L is line-to-line RMS voltage. √3 ≈ 1.732. Same total apparent-power convention as other three-phase tools on Tooladex.
Power factor links kW and kVA (kW = kVA × PF) but does not change the relationship I = S ÷ V when S is the apparent power you already stated in kVA.
Quick Reference Table
| Type | kVA | Voltage | Amps | Typical context |
|---|---|---|---|---|
| DC | 1 kVA | 48 V | 20.8 A | Rare kVA label; same as VA÷V |
| AC 1φ | 2 kVA | 230 V | 8.7 A | Small branch / UPS leg |
| AC 1φ | 10 kVA | 230 V | 43.5 A | Residential or commercial feed |
| AC 3φ | 30 kVA | 400 V | 43.3 A | Industrial (EU line-line) |
| AC 3φ | 100 kVA | 415 V | 139 A | Larger plant / AU style L-L |
FAQ
You entered apparent power in kVA. Line current from kVA and voltage follows I = S ÷ V (single-phase) or I = S ÷ (√3 × VL-L) (balanced three-phase). Use kW to amps when you start from real power and need PF on AC.
Yes — multiply kVA by 1,000 to get VA, then use the same voltage convention (RMS, line-to-line for three-phase).
This calculator’s three-phase mode expects VL-L (line-to-line RMS). If you only know VL-N, convert: VL-L = √3 × VL-N for a balanced wye, then use VL-L here.
Use kW = kVA × PF when PF is known, or our VA to Watts tool with VA = kVA × 1,000.