Autotransformer Designer

Enter input/output voltage and load; results update live.

Quick presets:

Inputs

Enter input/output voltage and load.

Input voltage V

Output voltage V

Load power W

Frequency Hz

Core material sets B

Flux density T — editable override

Stacking factor 0–1

Current density A/mm²

Stack thickness mm (optional)

Core temperature °C

Company / Client PDF header

Project name PDF header

Results

Transformer Design Report

Ratio

Voltage ratio (out/in) —

Currents

Input current —A

Output current —A

Common-winding current —A

VA / Savings

Equivalent two-winding VA —VA

Series winding VA —VA

Common winding VA —VA

VA saving vs isolation —VA

Reduced-core design

Copper loss (series+common) —W

Iron loss @Tcore —W

Iron loss @20°C —W

Copper mass —kg

Window utilization —%

Window winding layout (reduced core)

Common winding Series winding

Efficiency —%