This transformer turns calculator finds how many turns a winding needs from the EMF equation, using the voltage, frequency, core flux density, and core area. Enter the values above.
Formula (EMF equation)
N = V ÷ (4.44 × f × B × A)
- f — frequency (Hz), B — flux density (T), A — core area (m²)
Example
230 V, 50 Hz, B = 1.2 T, A = 16 cm²: N = 230 ÷ (4.44 × 50 × 1.2 × 0.0016) = 540 turns.
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Frequently Asked Questions
How do I calculate transformer turns?
Use N = V divided by (4.44 times frequency times flux density times core area), the standard EMF equation.
What is 4.44 in the EMF equation?
It is a constant equal to the square root of 2 times pi, arising from the RMS of a sinusoidal flux.
How do I get turns per volt?
Divide the number of turns by the voltage, or invert 4.44 x f x B x A to get turns per volt.