Impedance Transformer
Reflected impedance
Enter source impedance and both windings; the reflected impedance appears live.
Reflected impedance
How to use this calculator
A transformer reflects the load impedance to the primary side scaled by the square of the turns ratio: Zs = Zp / n² where n = Np / Ns. Enter the source (or primary-side) impedance and both windings, and the impedance seen on the other side appears live.
What it means in a real circuit
Impedance matching is one of the main reasons transformers exist in RF and audio. A 50 Ω source driving a 12.5 Ω load through a 2:1 (Np:Ns) transformer sees the load "stepped up" to 50 Ω at the primary, minimizing reflection. Because the scaling is the square of the voltage ratio, a 4:1 voltage transformer gives a 16:1 impedance transformation. Use this to design a matching transformer between a source and a load that aren't natively matched.