Transformer Turns Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the primary and secondary voltages and primary turns.
- Press Calculate.
How it works
Secondary turns = primary turns × secondary voltage ÷ primary voltage — the turns ratio matches the voltage ratio.
Worked example
240 V → 12 V, 1,000 turns. = 50 secondary turns.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.