Transformer Sizing Calculator kVA · Primary · Secondary
Enter kVA rating or load amps with primary and secondary voltages to calculate full-load amps and recommended transformer size.
By clicking Apply, you acknowledge that results are for reference only and must be verified by a qualified electrician.
Standard Transformer Sizes (kVA)
15, 25, 37.5, 45, 50, 75, 100, 112.5, 150, 167, 200, 225, 250, 300, 333, 500, 750, 1000, 1500, 2000, 2500. Always round up to the next standard size.
15, 25, 37.5, 45, 50, 75, 100, 112.5, 150, 167, 200, 225, 250, 300, 333, 500, 750, 1000, 1500, 2000, 2500. Always round up to the next standard size.
For reference only. Verify all results with the current NEC and local amendments. See Terms of Use.