Transformer Voltage Ratio Calculator
Use this simple transformer ratio workflow for ideal voltage-ratio checks. It does not evaluate taps, regulation, impedance, or winding configuration.
- Primary-to-secondary ratio
- x
- Secondary per primary volt
- x
- Primary voltage used
- V
- Secondary voltage used
- V
Calculation details
- Calculation basis
- Selection boundary
Recent results
Formulas
- Voltage ratio = primary voltage / secondary voltage
- Secondary per primary volt = secondary voltage / primary voltage
Use this calculator
Estimate transformer voltage ratio from primary and secondary voltages.
Read the result
Review the calculated values with their displayed units and assumptions. The result is a planning aid for the stated inputs, not a final equipment or installation decision.
Check before final work
This transformer ratio estimate uses ideal voltage ratio only. It does not evaluate taps, regulation, impedance, connection type, or equipment approval.
FAQs
Is this the same as turns ratio?
For an ideal transformer, the voltage ratio follows the turns ratio. Real equipment can also involve taps, regulation, winding connections, and manufacturer data.
Does this include transformer voltage regulation?
No. It is an ideal ratio check only and does not model loaded voltage drop or regulation.