Transformer Voltage Calculator
Easily calculate transformer output voltage using turns ratio or input voltage. Includes formulas, conversion tables, worked examples, and FAQs for quick reference.
primary to secondary voltage converter
Transformer voltage can be computed using the formula of turns ratio: V s = V p x (N s/ N p). In this case, V p is the primary voltage, N s is the secondary turns, and N p is the primary turns. The converse form of the formula can also be used to obtain input voltage when the output is known.
Formula & Table Summary:
- Secondary voltage: Vs = Vp × (Ns / Np)
- Primary voltage: Vp = Vs × (Np / Ns)
- Turns ratio from voltages: Np/Ns = Vp/Vs
- Percentage step (approx): %change = (Vs − Vp)/Vp × 100%
Converter Table (Input → Output)
| Input | Formula / Step | Output |
|---|---|---|
| Vp, Np, Ns | Vs = Vp × (Ns/Np) | Secondary voltage Vs |
| Vs, Np, Ns | Vp = Vs × (Np/Ns) | Primary voltage Vp |
| Vp, Vs | Turns ratio = Vp/Vs | Np/Ns (ratio) |
| Desired Vs, Vp | Choose Ns/Np = Vs/Vp, round to manufacturable turns | Recommended turns ratio |
electrical transformer voltage tool
The transformer voltage calculator can be used to find the secondary (output) or the primary (input) voltage of a transformer in a small amount of time using its turns ratio. The simple correlation is calculated as per the formula as V p/V s= N p/N s where V p and V s denote the primary and secondary voltage, and N p and N s denote the number of turns on the primary and secondary windings. When there are more turns in the secondary, the transformer increases or when there are less in the secondary, it decreases voltage. It comes in handy particularly in the design and analysis of power supplies, electrical circuits, and motor control systems. The ability to instantly change input to output voltages saves time and eliminates manual calculation errors by engineers, technicians and students with a calculator.
calculate transformer output voltage
| Scenario | Inputs | Calculation | Result |
|---|---|---|---|
| Step-down | Vp=230 V, Np=1000, Ns=100 | Vs=230×(100/1000) | Vs=23.0 V |
| Step-up | Vp=12 V, Np=50, Ns=500 | Vs=12×(500/50) | Vs=120 V |
| Find primary | Vs=24 V, Np=200, Ns=100 | Vp=24×(200/100) | Vp=48.0 V |
| Turns ratio from volts | Vp=120 V, Vs=12 V | Np/Ns = 120/12 | Turns ratio = 10 : 1 |
