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Transformer Calculator
Calculate transformer ratios and basic primary/secondary electrical values for study and field planning.
Professional workflow
Work through transformer turns ratio and voltage/current relationships quickly.
Transformer Calculator
Calculate transformer voltage ratio, turns ratio, and current ratio
Formula:
V₁/V₂ = N₁/N₂ = I₂/I₁
Voltage ratio = Turns ratio = Current inverse ratio
Primary Side
Secondary Side
💡 Enter known values, system calculates unknown values
Frequently asked questions
What does transformer ratio mean?
It compares primary and secondary voltage or turns counts.
Can current change across a transformer?
Yes. In an ideal transformer, voltage and current change inversely while power is conserved.
Is this for ideal transformers?
Basic calculations generally assume ideal behavior unless losses are specified.
Can I size real equipment with it?
Use it as a reference only; real equipment needs code and manufacturer data.