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Transformer Turns Ratio Calculator
Find the turns ratio and secondary turns for a required voltage change.
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Turns ratio
Compare Your Options And Get Clear Answers
Find the turns ratio and secondary turns for a required voltage change.
Transformer Turns Ratio Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Ratio = Np / Ns = Vp / Vs.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Transformer Quick Guide
Typical values for reference.
| Primary V | Secondary V | Turns | Ratio |
|---|---|---|---|
| 230 | 12 | 1000 | 19.17 : 1 |
| 400 | 230 | 1500 | 1.74 : 1 |
| 11000 | 415 | 2650 | 26.51 : 1 |
| 33000 | 11000 | 4000 | 3.00 : 1 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Transformer Turns Ratio Calculator FAQ
Answers to common questions about this calculator.
The ratio of primary to secondary turns, equal to the voltage ratio.
One with fewer secondary turns than primary turns.
Current scales inversely to voltage.
Real transformers have small deviations under load.