What this volt-amps to kilovolt-amps calculator does
This page converts apparent power in volt-amps into kilovolt-amps by dividing by 1,000. The relationship is linear, so the electrical quantity stays exactly the same while the displayed unit changes to a scale that is easier to read for larger loads.
That makes it a clean formatting and comparison tool. If one source lists a load in VA and another lists capacity in kVA, the calculator puts both on the same basis without introducing any extra assumptions.