Transformer Sizing Calculator
Transformer Sizing
Calculate transformer VA rating for your load.
Formula
VA = Load Watts / Power Factor x (1 + Margin / 100)
Frequently Asked Questions
How do I size a transformer?
Divide total watts by power factor and add a 25 percent margin.
What is a good power factor?
Most mixed loads have a power factor of 0.8 to 0.9.