# Transformer Calculator Plus — Step-up Step-down Transformer

> Transformer parameter calculator for voltage, current, and turns ratio. (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/transformer-calculator-plus/id1372528401 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 3.30/5 from 4 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 1 MB
- Languages: American English
- Released: 2018-04-22
- Data updated: 2026-08-22
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/transformer-calculator-plus/id1372528401/reviews.md

## What is Transformer Calculator Plus?

Transformer Calculator calculate any parameter within the transformer equation, including primary and secondary voltage, current, and turns.

Transformer Calculations Include:
Transformer Turns Ratio – Current and Turns
Transformer Turns Ratio – Voltage and Turns
Transformer Turns Ratio – Voltage and Current
The result will indicate whether the transformer is step-up or step-down.

Transformers are primarily used as power converters. The two types—step-up and step-down—operate on the same principle but in opposite directions. A step-up transformer converts a lower AC voltage to a higher voltage, while a step-down transformer reduces a higher AC voltage to a lower level. For example, if a country uses 110 V power, a step-up transformer converts it to 220 V, and a step-down transformer does the reverse. Both work with alternating current (AC).

A transformer consists of a soft iron core with two coils wound around it, which are not electrically connected. These coils may be wound on separate limbs of the iron core or placed one over the other.

The coil to which the alternating voltage is applied is called the primary coil or primary winding. When an alternating voltage is applied, the resulting alternating current in the primary winding generates a changing magnetic field. This changing field induces an alternating current in the secondary coil. The magnitude of the induced voltage depends on the number of turns in the secondary winding.

All transformers have a nameplate rating. It is best to operate them within the voltage limits specified. Using a step-down transformer below its rated limit can support a wide range of applications, but exceeding the specified limit is dangerous and may cause electrical failure.

The relationship between voltage, current, and the number of turns in each coil is given by:

Vp/Vs = Np/Ns = Is/Ip

Where:
Vp – Primary voltage
Vs – Secondary voltage
Np – Primary turns
Ns – Secondary turns
Ip – Primary current
Is – Secondary current

Thank you for your support, and please visit nitrio.com for more apps for your iOS devices.

## Key features

- Calculate primary and secondary voltage
- Calculate primary and secondary current
- Calculate transformer turns ratio
- Determine step-up or step-down transformer
- Supports AC voltage calculations

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/transformer-calculator-plus/id1372528401/reviews.md

### 1/5 — Dissatisfaction

*2022-04-08*

This app is super generic and only good if you want to calculate the number of turns in a transformer.  In industry you never speak of turns in a transformer…just voltages, amps, and KVA.   That’s what I was hoping this was but it isn’t.

### 1/5 — Basic app not worth $2.99

*2019-06-23*

Well it’s a basic app. I’m not sure if it would calculate things right but I have my doubts. To start you punch in what u want for input and output and it spits out your windings or amps you can’t get what wire size information that you need or core size. The other thing is you can’t figure in for multi tapping, say I want 240v in two 120v out and a 60v out you can’t do it. Like I said it’s not worth $2.99 wish I could get my money back.

## Frequently asked questions about Transformer Calculator Plus

### What calculations can Transformer Calculator Plus perform?

Transformer Calculator Plus can calculate the transformer turns ratio based on voltage and turns, or current and turns. It also determines whether the transformer is step-up or step-down.

### What is the price of Transformer Calculator Plus?

Transformer Calculator Plus is a paid app, priced at $2.99.

### What devices is Transformer Calculator Plus available on?

Transformer Calculator Plus is available for iPhone, iPad, and iPod touch devices.

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

Transformer Calculator Plus has an age rating of 4+, making it suitable for a wide range of users.

### How often is Transformer Calculator Plus updated?

The app was last updated on September 30, 2025, with version 1.2. This indicates it receives periodic updates.

### Does Transformer Calculator Plus have ads?

No, Transformer Calculator Plus does not contain advertisements.

### What is the user sentiment for Transformer Calculator Plus based on ratings?

Transformer Calculator Plus has an average rating of 3.3 stars from 4 ratings, suggesting a mixed but generally positive user reception.

### When was Transformer Calculator Plus first released?

Transformer Calculator Plus was first released on April 22, 2018.

## Version history (last 3 releases)

### 1.2 — 2025-09-30

- Updated for the newest devices.
- Minor bugs fixed.

### 1.1 — 2020-12-30

- Update for Newest Devices
- Bug Fixed

### 1.0 — 2018-04-16

No release notes.

## Apps similar to Transformer Calculator Plus

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All apps by Nitrio: https://appshunter.io/developer/321121189

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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 2026-08-22.*