Transformer Calculator
⚡ Electricity & magnetism. Use the Transformer formula to find secondary voltage, primary voltage, secondary turns, primary turns: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Secondary voltage | V |
| Primary voltage | V |
| Secondary turns | no unit |
| Primary turns | no unit |
Worked example
Find the secondary voltage when Primary voltage = 230 V, Secondary turns = 60, Primary turns = 1150.
Using Vs/Vp = Ns/Np: Secondary voltage = 12 V.
Frequently asked questions
What is the formula for Transformer?
Vs/Vp = Ns/Np.
What do the letters stand for, and what units are used?
Secondary voltage in V, Primary voltage in V, Secondary turns, Primary turns.
How do you calculate secondary voltage?
Put the values into Vs/Vp = Ns/Np. For example, with Primary voltage = 230 V, Secondary turns = 60, Primary turns = 1150, secondary voltage = 12 V.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (secondary voltage, primary voltage, secondary turns, primary turns) and fill in the others: it rearranges the formula for you.
