# Transformer Calculator. — primary / secondary

> Utility app for calculating transformer current, voltage, and turns ratio. (iPhone/iPad app by V PUGAZHENTHI.)

- Source: https://appshunter.io/ios/app/transformer-calculator/id1506155081 (this page in markdown: same URL + `.md`)
- Developer: [V PUGAZHENTHI](https://appshunter.io/developer/491898049)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 4.80/5 from 47 App Store ratings
- Age rating: 4+
- Requires: iOS 17.6 · 41 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, European Portuguese, Chinese (Simplified, China), Latin American Spanish
- Released: 2020-04-04
- Data updated: 2026-08-27
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/transformer-calculator/id1506155081/reviews.md

## What is Transformer Calculator.?

Transformer Calculator: A user-friendly app for Current and Voltage Calculations.

Current Calculations
 • Calculate primary and secondary full-load currents.
 • Determine the turns ratio and transformer type.

How it works:
 1. Select the phase type (1Φ or 3Φ).
 2. Input transformer ratings (VA/kVA) and primary/secondary voltages.

Outputs:
 • Primary full-load current
 • Secondary full-load current
 • Turns Ratio:  N1 / N2 = V1 / V2 = I2/ I1

Voltage Calculations
How it works:
 1. Enter Number of turns in the primary and secondary windings
 2. Input Primary voltage

Outputs:
 • Secondary voltage
 • Turns Ratio: N1 / N2 = V1 / V2 = I2/ I1

Effortless and Accurate: Perfect for engineers and students to compute transformer parameters precisely.

## Key features

- Primary and secondary current calculations
- Turns ratio determination
- Transformer type identification
- Secondary voltage calculation
- Supports 1Φ and 3Φ phases
- User-friendly interface

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Go Pro | $3.99 | one-time |



## Frequently asked questions about Transformer Calculator.

### What calculations can Transformer Calculator perform?

Transformer Calculator can compute primary and secondary full-load currents, determine the turns ratio, and calculate secondary voltage based on the number of turns and primary voltage. It also helps identify the transformer type.

### Is Transformer Calculator free to use?

Yes, Transformer Calculator is free to download and use. It does contain advertisements and offers in-app purchases.

### Does Transformer Calculator have ads?

Yes, Transformer Calculator contains advertisements. These ads are displayed within the application.

### What devices is Transformer Calculator available on?

Transformer Calculator is available on iPhones and iPads, making it accessible for users on Apple mobile devices.

### How often is Transformer Calculator updated?

The latest version, 2.7, was last updated on January 30, 2026. While specific update frequency isn't detailed, this indicates ongoing development.

### What is the age rating for Transformer Calculator?

Transformer Calculator has an age rating of 4+, making it suitable for a wide range of users, including younger students learning about electrical concepts.

### How accurate are the calculations in Transformer Calculator?

The app is designed for precise computation of transformer parameters, and its high rating of 4.8 stars from 47 ratings suggests users find the calculations to be accurate and reliable.

### Can Transformer Calculator handle different phase types?

Yes, Transformer Calculator allows users to select between 1Φ (single-phase) and 3Φ (three-phase) types for their calculations, offering flexibility for various transformer configurations.

## Version history (last 5 releases)

### 2.7 — 2026-01-30

New Feature: Calculate Transformer Resistance Imbalance with IEC/IEEE/NEC support.

### 2.5 — 2025-07-02

New: Share Transformer Calculations instantly with a tap!

### 2.4 — 2025-04-08

This release includes regular performance improvements and bug fixes.

### 2.3.1 — 2025-01-30

A quick fix to improve stability and performance.

### 2.3 — 2024-12-24

- regular update for better performance
- updated for iOS 18

## Apps similar to Transformer Calculator.

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Southwire® Voltage Drop Calc](https://appshunter.io/ios/app/southwire-voltage-drop-calc/id440338420) | 4.6 (1,462) | Free | Utilities |
| [Transformer Calc 2](https://appshunter.io/ios/app/transformer-calc-2/id1597015791) | 1.0 (1) | $3.99 | Utilities |
| [ElectriCalc Pro](https://appshunter.io/ios/app/electricalc-pro/id569677304) | 4.9 (354) | Free | Utilities |
| [Transformer Calculator Plus](https://appshunter.io/ios/app/transformer-calculator-plus/id1372528401) | 3.3 (4) | $2.99 | Utilities |
| [Southwire® Conversion Calc](https://appshunter.io/ios/app/southwire-conversion-calc/id545756420) | 4.2 (5) | Free | Utilities |
| [Southwire® Conduit Fill Calc](https://appshunter.io/ios/app/southwire-conduit-fill-calc/id509204523) | 4.5 (746) | Free | Utilities |

## More apps by V PUGAZHENTHI

- [Ohms Law Calc.](https://appshunter.io/ios/app/ohms-law-calc/id491898006)
- [Electrical Calculator](https://appshunter.io/ios/app/electrical-calculator/id495478153)
- [Electrical Converter](https://appshunter.io/ios/app/electrical-converter/id497685179)
- [Electrical Engineering Pack](https://appshunter.io/ios/app/electrical-engineering-pack/id505423236)
- [Elec Series & Parallel Calc.](https://appshunter.io/ios/app/elec-series-and-parallel-calc/id511296315)
- [Universal Converter.](https://appshunter.io/ios/app/universal-converter/id519552652)

All apps by V PUGAZHENTHI: https://appshunter.io/developer/491898049

## Related topics

[kva calculator](https://appshunter.io/ios/topics/kva-calculator) · [transformer lab](https://appshunter.io/ios/topics/transformer-lab) · [top hand transformer lab](https://appshunter.io/ios/topics/top-hand-transformer-lab)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*