Turns Ratio Calculator
Calculate a transformer's turns ratio from primary and secondary voltage (a = Vp ÷ Vs).
Formula
a = Vp ÷ Vs
- a
- Turns ratio
- Vp
- Primary voltage, in volts
- Vs
- Secondary voltage, in volts
What this calculator does
Calculates a transformer's turns ratio from its primary and secondary voltage.
Use cases
- Check a transformer's rated turns ratio against measured voltages
- Find the expected secondary voltage for a known primary voltage and ratio
- Compare step-up vs. step-down transformer specifications