Transformer Turns Ratio Calculator
Secondary voltage and currents from a transformer turns ratio.
V
A
%
How it works
Secondary voltage = primary voltage × secondary turns ÷ primary turns. Primary current = secondary power ÷ efficiency ÷ primary voltage, since a real transformer draws more power than it delivers. Example: with the default values, secondary voltage comes to 23 V.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.