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Transformer Calculator

Science & Engineering

Turns ratio, voltage & current

Quick Answer

Transformer Calculator: Turns ratio, voltage & current. Transformer Calculator uses standard science & engineering formulas to compute accurate results instantly.

V
V
Turns ratio (primary:secondary)
18.333 : 1
Type：Step-down

Calculation steps

  1. 1Turns ratio N1:N2 = V1:V2 = 220:12
  2. 2= 18.333 : 1
  3. 3e.g. if primary has 1000 turns, secondary needs 54.5 turns

Core relations (ideal transformer)

V1/V2 = N1/N2Voltage ∝ turns
I1/I2 = N2/N1Current ∝ inverse turns
P1 = P2Power conserved (ideal)
Step-downN1 > N2, e.g. 220V → 12V adapter
Step-upN1 < N2, e.g. grid 110kV → 220kV
Transformers only work on AC — electromagnetic induction needs a changing flux. High-voltage transmission cuts losses: for the same power, higher voltage means lower current, and line loss P = I²R shrinks quadratically. That is why grids step up to hundreds of kV for long distance.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Transformer Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Transformer Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Turns ratio, voltage & current.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Transformer Calculator formula

Transformer Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Transformer Calculator?
Open the page and fill in the input fields — results update automatically. Turns ratio, voltage & current.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Transformer Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/transformer

Results provided by this tool are for reference only and do not constitute professional advice.