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Transformer Ratio Calculator

Voltage and current on the secondary of a transformer.

Compute the secondary voltage and current of an ideal transformer from the turns ratio and primary-side values.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

V
A

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

V_s / V_p = N_s / N_p and I_s / I_p = N_p / N_s.

In depth

Compute the secondary voltage and current of an ideal transformer from the turns ratio and primary-side values.