kVA Calculator
Convert voltage and current to kVA for single-phase or three-phase systems.
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Introduction
kVA Calculator — Convert voltage and current to kVA for single-phase or three-phase systems. Enter Voltage (V), Current (A), Phase to get an instant, accurate result.
Formula
Single-phase: kVA = (V × I) / 1000. Three-phase: kVA = (√3 × V_line × I_line) / 1000.
Step-by-step
- Enter the Voltage (V).
- Enter the Current (A).
- Enter the Phase.
- Click Calculate to see your result instantly.
Real-world example
Example: With Voltage (V) = 120, Current (A) = 10, Phase = no, the kVA Calculator gives Kva: 1.2, Three Phase: no.
Frequently Asked Questions
Is kVA the same as kW?
Only when power factor is 1. In general, kW (real power) = kVA (apparent power) × power factor, so kVA is always equal to or greater than kW.
Why are generators and transformers rated in kVA?
Because their current-carrying and heat-dissipation limits depend on current and voltage directly, independent of the connected load's power factor — kVA captures that limit regardless of what's plugged in.
What inputs does the kVA Calculator need?
You'll need to provide: Voltage (V), Current (A), Phase. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the kVA Calculator?
The kVA Calculator applies the formula exactly as calculated — Single-phase: kVA = (V × I) / 1000. Three-phase: kVA = (√3 × V_line × I_line) / 1000. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the kVA Calculator free to use?
Yes, the kVA Calculator is completely free, requires no signup, and runs instantly in your browser.
About the kVA Calculator
The kVA Calculator uses a real, verifiable formula — Single-phase: kVA = (V × I) / 1000. Three-phase: kVA = (√3 × V_line × I_line) / 1000. — so results are accurate every time, not an approximation.