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Transformer Power Efficiency and Secondary Current Calculator

N₁/N₂ = V₁/V₂ = I₂/I₁ — ideal transformer ratios.

Calculates transformer secondary voltage V₂ = V₁·(N₂/N₁), secondary current I₂ = I₁·(N₁/N₂), and overall efficiency η = P_out/P_in for a non-ideal transformer.

Dr. Helena Ortiz 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

V₂ = V₁·(N₂/N₁); I₂ = P_in·η / V₂

In depth

Calculates transformer secondary voltage V₂ = V₁·(N₂/N₁), secondary current I₂ = I₁·(N₁/N₂), and overall efficiency η = P_out/P_in for a non-ideal transformer.