# Rule of Three Calculator

> Calculates an unknown number in a ratio based on two known number pairs. (iPhone/iPad app by Saran Dumronggittigule.)

- Source: https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300 (this page in markdown: same URL + `.md`)
- Developer: [Saran Dumronggittigule](https://appshunter.io/developer/1083622848)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 2.30/5 from 4 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 16 MB
- Languages: American English
- Released: 2016-12-14
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300/reviews.md

## What is Rule of Three Calculator?

Calculator for finding a number in the same ratio to a given number as exists between two other given numbers.

## Key features

- Ratio calculation
- Proportion solving
- Finds unknown numbers
- Simple interface

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300/reviews.md

### 1/5 — Ads

*2018-11-24, version 1.1*

To many ads interrupt the process.

### 3/5 — One thing missing

*2018-11-16, version 1.1*

Interface is perfectly simple but often when doing rule of thirds calculations is for comparisons. A button to clear all boxes would make it perfect for a better use.

## Frequently asked questions about Rule of Three Calculator

### What is the Rule of Three Calculator used for?

The Rule of Three Calculator is used to find an unknown number when you know the relationship between two other pairs of numbers. It's helpful for solving problems involving ratios and proportions.

### Is the Rule of Three Calculator free to use?

Yes, the Rule of Three Calculator is available for free. It does not require any payment to download or use its core functionality.

### What devices is the Rule of Three Calculator compatible with?

The Rule of Three Calculator is designed for Apple devices, including iPhone, iPad, and iPod. It is not available on Android or other operating systems.

### How often is the Rule of Three Calculator updated?

The Rule of Three Calculator was last updated on December 14, 2016, with version 1.1. There have been no updates since then.

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

The Rule of Three Calculator has an age rating of 4+. This indicates it is suitable for users aged four and above.

### Does the Rule of Three Calculator have ads?

No, the Rule of Three Calculator does not contain advertisements. As it is a free app, this is a notable aspect of its user experience.

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

The Rule of Three Calculator has a user rating of 2.3 stars, based on 4 ratings. This suggests a mixed to negative user reception.

### Does the Rule of Three Calculator offer in-app purchases?

Yes, the Rule of Three Calculator does have in-app purchases available. However, the specific items or features offered through these purchases are not detailed.

## Version history (last 1 release)

### 1.1 — 2016-12-14

This app has been updated by Apple to display the Apple Watch app icon.

## Apps similar to Rule of Three Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [SSI Steel Design](https://appshunter.io/ios/app/ssi-steel-design/id1474838160) | 3.0 (1) | Free | Utilities |
| [Calculator 5 - Multitask cal](https://appshunter.io/ios/app/calculator-5-multitask-cal/id1661757579) | — | $2.99 | Utilities |
| [Calculator-Math Toolbox](https://appshunter.io/ios/app/calculator-math-toolbox/id1561702545) | 4.7 (339) | Free | Utilities |
| [CountKeeper - Tally Counter](https://appshunter.io/ios/app/countkeeper-tally-counter/id1660234121) | — | Free | Utilities |
| [TLF Events Tamil](https://appshunter.io/ios/app/tlf-events-tamil/id1481109080) | — | Free | Utilities |
| [レコーダー - スピークバディ パーソナルコーチング](https://appshunter.io/ios/app/id1469874020) | — | Free | Utilities |

## More apps by Saran Dumronggittigule

- [Live Wallpaper Collection - Photo Video HD for Lock Screen](https://appshunter.io/ios/app/live-wallpaper-collection-photo-video-hd-for-lock-screen/id1083622849)
- [ข่าว IT](https://appshunter.io/ios/app/it/id1112731433)
- [ReWords - Spelling Test](https://appshunter.io/ios/app/rewords-spelling-test/id1487995726)

All apps by Saran Dumronggittigule: https://appshunter.io/developer/1083622848

## Related topics

[rule of three calculator](https://appshunter.io/ios/topics/rule-of-three-calculator) · [saran dumronggittigule](https://appshunter.io/ios/topics/saran-dumronggittigule) · [Rule of Three](https://appshunter.io/ios/topics/rule-of-three)

---

*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 2026-06-01.*