Electrical / Transformers

Transformer Ratio Calculator

Solve ideal secondary voltage or turn count and the corresponding inverse current ratio.

Ideal transformer

Primary voltagePrimary turnsSecondary turnsPrimary currentOptional; clear to omit ideal secondary current.

Ideal ratio result

Secondary voltage23 V

0.1 secondary/primary ratio

Secondary voltage: 23 V
Secondary turns: 100
Voltage / turns ratio: 0.1
Ideal secondary current: 10 A

This is an ideal ratio calculation. Real transformers have regulation, magnetising current, winding loss, temperature rise, insulation and core-flux limits that require manufacturer or design data.