# Rule of Three Easy — Calculate cross-multiplication

> App for calculating proportional quantities using cross-multiplication. (iPhone/iPad app by Marcio Rocha da Rosa.)

- Source: https://appshunter.io/ios/app/rule-of-three-easy/id1553014021 (this page in markdown: same URL + `.md`)
- Developer: [Marcio Rocha da Rosa](https://appshunter.io/developer/1502434804)
- Category: Utilities, Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 27 MB
- Languages: English, Portuguese
- Released: 2021-02-15
- Data updated: 2026-06-22
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/rule-of-three-easy/id1553014021/reviews.md

## What is Rule of Three Easy?

We do Rule of Three's calculations, also known as cross multiplication, several times a day, often without even realizing it. This application has been made to make your life easier, making it possible, in seconds, to solve issues that are common in our daily lives, such as changing quantities of ingredients in recipes, calculating fuel consumption, finding any kind of quantities that are proportional, etc.
Rule of Three is a simple, useful and free app.

## Key features

- Rule of three calculations
- Cross-multiplication solver
- Recipe ingredient adjustment
- Fuel consumption calculation
- Proportional quantity finding


## Frequently asked questions about Rule of Three Easy

### What is Rule of Three Easy used for?

Rule of Three Easy is used to calculate proportional quantities, also known as cross-multiplication. It helps with tasks like adjusting recipe ingredients or calculating fuel consumption.

### Is Rule of Three Easy free to use?

Yes, Rule of Three Easy is a free app, though it does contain advertisements.

### Does Rule of Three Easy have ads?

Yes, Rule of Three Easy contains advertisements.

### What devices can I use Rule of Three Easy on?

Rule of Three Easy is available for iPhone and iPad devices.

### What is the age rating for Rule of Three Easy?

Rule of Three Easy has an age rating of 4+, making it suitable for young users.

### How often is Rule of Three Easy updated?

The latest version of Rule of Three Easy was released on August 18, 2025, indicating regular updates.

### What is the user rating for Rule of Three Easy?

Rule of Three Easy has a perfect rating of 5.0 stars based on one review.

## Version history (last 5 releases)

### 3.5.4 — 2025-08-18

Icon size fixed.
Updated app libraries.

### 3.5.3 — 2025-07-31

Updated app libraries

### 3.5.2 — 2024-07-06

Updated app libraries

### 3.5.1 — 2024-04-07

• App libraries updated
• Design improvements

### 3.5.0 — 2023-08-22

Updating app libraries.

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## More apps by Marcio Rocha da Rosa

- [Hashtags em Português Pro](https://appshunter.io/ios/app/hashtags-em-portugues-pro/id1502434805)
- [Hashtags em Português](https://appshunter.io/ios/app/hashtags-em-portugues/id1502600961)
- [Heat Index and Wind Chill](https://appshunter.io/ios/app/heat-index-and-wind-chill/id1550107650)
- [Frases em Português](https://appshunter.io/ios/app/frases-em-portugues/id1559451610)
- [Movie Patrol Pro](https://appshunter.io/ios/app/movie-patrol-pro/id6452879373)

All apps by Marcio Rocha da Rosa: https://appshunter.io/developer/1502434804

## Related topics

[Rule of Three](https://appshunter.io/ios/topics/rule-of-three) · [rule of three easy](https://appshunter.io/ios/topics/rule-of-three-easy) · [regra de 3](https://appshunter.io/ios/topics/regra-de-3)

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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 2026-06-22.*