Engineering

Transformer Calculator

Use this transformer calculator to calculate calculate transformer secondary voltage, current, and turns ratio.

transformerturns ratiovoltagecurrent

Calculator

Calculate instantly

Calculator Inputs

Choose what you want to calculate, enter realistic values, adjust units where shown, and use the scenario section for repeated-use planning.

Primary voltageVV0480

Primary turns05000

Secondary turns0500

Primary currentAA010

Input and Formula Breakdown

This calculator applies the formula Vs/Vp = Ns/Np. Enter each value with the matching unit, and AZCalculate updates the result instantly.

Primary voltage

240 V

Primary turns

1,000

Secondary turns

100

Primary current

2 A

Secondary voltage

24 V

Ideal secondary current

20 A

Turns ratio

10 :1

Scenario and Comparison

Usage counttimesComparison adjustment%

Current

24 V

Projected

288

Adjusted

26.4

Visual Comparison

Current result24

Projected usage288

Comparison scenario26.4

Formula Explanation

Vs/Vp = Ns/Np

This calculator applies the formula Vs/Vp = Ns/Np. Enter each value with the matching unit, and AZCalculate updates the result instantly.

Use Cases

Estimate transformer output
Compare turns ratios
Plan electrical systems

Step-by-Step Explanation

Step 1Enter the known values in the calculator fields.
Step 2Keep the units consistent with the labels shown beside each input.
Step 3Apply the formula: Vs/Vp = Ns/Np.
Step 4Review the primary result and supporting values.

Example calculation

Example transformer calculator

Given

Primary voltage: 240 V
Primary turns: 1000
Secondary turns: 100
Primary current: 2 A

Steps

Use the values shown above.
Apply Vs/Vp = Ns/Np.

Result

The calculator above shows the computed answer instantly from these example values.

Calculator guide

About this Transformer Calculator

Calculate transformer secondary voltage, current, and turns ratio. This page includes an interactive calculator, concise formula notes, worked examples, FAQs, related calculators, and practical guidance you can revisit whenever needed.

transformer turns ratio voltage current

Found something that does not look right?

We work hard to keep every calculator accurate and useful. If you notice a calculation error, missing option, or unclear explanation, please let us know so we can review and correct it promptly.

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Most active date

2026-06-05

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