# Unit Converter Calculator Pro — Simple With Metric & Imperial

> Converts metric and imperial units for various measurements with scientific prefixes. (iPhone/iPad app by Rome Rock LLC.)

- Source: https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631 (this page in markdown: same URL + `.md`)
- Developer: [Rome Rock LLC](https://appshunter.io/developer/1190244007)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 4.70/5 from 977 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 37 MB
- Languages: American English, French (France), European Spanish
- Released: 2018-03-06
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631/reviews.md

## What is Unit Converter Calculator Pro?

With Unit Converter Calculator you will be able to convert all types of units from Metric to Imperial systems & Vice-versa in seconds. Finding the area, speed, distance, temperature, volume, time, weight, energy, power and more converted into different units.

These are some of the conversions you can easily do with our * Simple Unit Converter Calculator *

•	Area: Yards, Acres, Hectares & Square: Meters, Miles, Inches & Feet.
•	Distance / Length: Meters, Miles, Inches, Feet, Yards, Nautical Miles.
•	Speed / Velocity: Kilometers / Miles per hour, Feet per second, Knots, Speed of sound, Speed of light.
•	Temperature: Celsius, Fahrenheit, Kelvin.
•	Time: Seconds, Minutes, Hours, Weeks, Months, Years.
•	Volume: Litters, Cubic Meters, Cubic Inches, Cubic Feet, Gallons, Quarts, Pints, Cups, Teaspoons, Tablespoons, Fluid ounces.
•	Weight / Mass: Grams, Kilograms, Milligrams, Pounds, Ounces, Tons, Stones.
•	Energy / Power / Torque: Watts, Joules, Calories, ElectronVolt, BTU, Therms, Foot-Pond.

Plus an advanced view which makes available Scientific prefixes like Exa, Peta, Tera, Giga, Mega, Kilo, Deci, Centi, Milli, Micro, Nano, Pico, etc. Allowing you to make more scientific calculations.

** Main Features **

•	The app is Multi-language, so you will get the correct unit name based on your language, either using the option or manually changing it. 
•	Our library of available units to convert has the best selection, preventing the display of units that no one ever uses and displaying only the most used ones.
•	Make every calculation and combination between units possible, including scientific notation and time-based units.
•	History of your latest conversions so you can view them instantly without needing to recalculate every time.
•	No internet connection is needed to use this app.

Download Now! Quick Unit Converter Calculator for FREE!

## Key features

- Metric to Imperial unit conversion
- Imperial to Metric unit conversion
- Area, speed, temperature, volume, weight conversions
- Scientific prefixes support
- Conversion history
- Offline functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads & Unlock Themes | $2.99 | one-time |
| Remove Ads & Unlock Themes 1 | $4.99 | one-time |
| Remove Ads & Unlock Themes 2 | $6.99 | one-time |
| Remove Ads & Unlock Themes 3 | $9.99 | one-time |


## What do users think of Unit Converter Calculator Pro?

Overall sentiment: positive

**Pros**

- 🚀 Easy & accurate
- 🚀 Excellent Tool
- 👍 Goog for social
- 👍 Excelente para mi trabajo
- 👍 Sencillez
- 👍 Stylish
- 👍 Beautiful app
- 👍 Amazing!

**Cons**

- 👎 Hard to use interface
- 👎 Lacks pressure units
- 👎 No reverse button
- 👎 Metric to imperial format not user-friendly

**Commonly reported bugs**

- 🐛 Changing to something else

**Most requested features**

- 💡 Favorite conversations
- 💡 Color-coded sections
- 💡 Money conversion

## Recent user reviews (10 of 20)

All indexed reviews: https://appshunter.io/ios/app/unit-converter-calculator-pro/id1343845631/reviews.md

### 5/5 — Easy & accurate

*2026-02-20, version 2.0.4*

Very easy to use.  I use it a lot in my kitchen for recipes, in my garden and shop. Great app.

### 5/5 — Excellent Tool

*2025-05-26, version 2.0.4*

Excellent converter for we Americans who should have gone to the metric system 50 years ago.

### 5/5 — Units

*2025-01-02, version 2.0.4*

Goog for social

### 4/5 — it's got it all

*2024-11-03, version 2.0.4*

in a really hard to use interface.

simplest improvement for this app would add a favorite conversations. having to manually navigate the drop downs all the time is a huge drag.

maybe color code the different sections too. help my brain remember where to do certain tasks. 

ultimately searching google is just faster and easier..

### 3/5 — Decent

*2024-10-17*

App is a good start compared to others. Looks good, but could have some functionality added to make things easier. Also it definitely needs pressure units.

### 1/5 — Changing to something else

*2024-05-29, version 2.0.4*

This does not have psi, kpa, or other pressure conversions anymore.

### 5/5 — Tgxtxtydkljydjfggihihi

*2024-05-19, version 2.0.4*

Gjgigigihoh

### 3/5 — Works but could be easier

*2024-04-15, version 2.0.4*

Works pretty well but if you are going back and forth between 2 units you always need to choose which ones. Would be great to add the reverse button.

### 5/5 — Muy buena app

*2023-06-18, version 2.0.3*

Excelente para mi trabajo

### 1/5 — Not useful, I can't convert 1mm to inches

*2023-01-22, version 2.0.3*

Ppiittuuutttooo32As

## Frequently asked questions about Unit Converter Calculator Pro

### What does Unit Converter Calculator Pro do?

Unit Converter Calculator Pro allows you to convert various units between metric and imperial systems. It supports a wide range of measurements such as area, speed, distance, temperature, volume, time, and weight. The app also includes support for scientific prefixes for more advanced calculations.

### What are the main features of this unit converter app?

Key features include the ability to convert between metric and imperial units, support for numerous measurement types like area, speed, and temperature, an advanced view for scientific prefixes, a history of recent conversions, and offline functionality. The app is also multi-language.

### Is Unit Converter Calculator Pro free to use?

The app is available for free download and use. It does contain advertisements and offers in-app purchases, which may be for removing ads or unlocking additional features.

### Can I use Unit Converter Calculator Pro without an internet connection?

Yes, a significant advantage of this app is that no internet connection is needed to use it. You can perform all your unit conversions offline, making it convenient for use anywhere.

### What types of units can I convert with this app?

The app supports conversions for area, distance/length, speed/velocity, temperature, time, volume, weight/mass, and energy/power/torque. It also includes scientific prefixes like Exa, Peta, Tera, and more for scientific calculations.

## Version history (last 5 releases)

### 2.0.4 — 2023-10-31

Fixed some issues in the app.

### 2.0.3 — 2019-11-24

Bug Fixes & Improvements

### 2.0.2 — 2019-02-09

Fixed issue with Volume - Table Spoon (Imperial)

### 2.0.1 — 2018-12-13

fixes on calculations

### 2.0 — 2018-11-20

* Bug Fixes

## Apps similar to Unit Converter Calculator Pro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Unit Converter and Calculator.](https://appshunter.io/ios/app/unit-converter-and-calculator/id1559358634) | 4.2 (80) | Free | Utilities |
| [Conversion Calculator - Metric](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523) | 4.8 (157) | Free | Utilities |
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## More apps by Rome Rock LLC

- [Tip Calculator & Bill Split](https://appshunter.io/ios/app/tip-calculator-and-bill-split/id1190244008)
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- [Sales Tax & Discounts](https://appshunter.io/ios/app/sales-tax-and-discounts/id1384309113)
- [Loans & Interests Simulator](https://appshunter.io/ios/app/loans-and-interests-simulator/id1403190089)
- [52 Week Money Saving Challenge](https://appshunter.io/ios/app/52-week-money-saving-challenge/id1422523462)

All apps by Rome Rock LLC: https://appshunter.io/developer/1190244007

## Related topics

[simple unit convert](https://appshunter.io/ios/topics/simple-unit-convert) · [simple unit converter](https://appshunter.io/ios/topics/simple-unit-converter)

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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 2026-08-26.*