This transformer turns ratio reference table shows the turns ratio (primary : secondary) for a range of primary voltage values, assuming a secondary voltage of 12 V and a primary turns of 1,000. Every figure is computed with the same engine that powers our Transformer Turns Ratio Calculator, so the numbers are exact.
| Primary voltage | Turns ratio (primary : secondary) | Secondary turns |
|---|---|---|
| 58 V | 4.833 | 207 |
| 120 V | 10.000 | 100 |
| 170 V | 14.167 | 71 |
| 230 V | 19.167 | 52 |
| 350 V | 29.167 | 34 |
| 460 V | 38.333 | 26 |
| 690 V | 57.500 | 17 |
| 1,200 V | 100.000 | 10 |
| 1,600 V | 133.333 | 8 |
| 2,300 V | 191.667 | 5 |
How to use this table
Find the row closest to your primary voltage and read across to the turns ratio (primary : secondary). For a value between two rows, the real figure sits between them — or enter your exact numbers in the Transformer Turns Ratio Calculator for a precise answer.
Need a value that is not in the table? — the Transformer Turns Ratio Calculator does it instantly, for free, with the formula and a worked example built in.
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