Science
Voltage drop
Estimate DC voltage drop from current, one-way length and conductor resistance.
Calculators / Science / Transformer turns ratio
Transformer turns ratio calculator
Calculate an ideal transformer voltage, current, and turns relationship.
On this page
Voltage and turns ratio9.58×
Secondary turns104.35turns
Ideal primary current0.52A
Calculator controls
How to calculate
Calculate an ideal transformer voltage, current, and turns relationship.
Vp ÷ Vs = Np ÷ Ns; ideal input power = output power
Worked example
Primary voltage (V): 230; Secondary voltage (V): 24; Primary turns: 1000; Secondary current (A): 5.
Voltage and turns ratio: 9.58 ×; Secondary turns: 104.35 turns; Ideal primary current: 0.52 A.
Assumptions and limits
Real transformers have winding losses, magnetizing current, regulation, insulation, frequency, temperature, and core-flux limits.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Calculate an ideal transformer voltage, current, and turns relationship. Every assumption remains visible so the result can be checked or changed.
When this tool is useful
Use the transformer turns ratio for an initial estimate, comparison, or classroom calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Primary voltage (V) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Secondary voltage (V) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Primary turns | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Secondary current (A) | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What are the limits of this transformer turns ratio?
Real transformers have winding losses, magnetizing current, regulation, insulation, frequency, temperature, and core-flux limits.
Can I use different units?
Use the units printed beside each field. Convert measurements first when your source uses different units.