# iFormula - Your Own Calculator

> Create, save, and share custom calculators with a powerful formula editor. (iPhone/iPad app by 建华 温.)

- Source: https://appshunter.io/ios/app/iformula-your-own-calculator/id665486714 (this page in markdown: same URL + `.md`)
- Developer: [建华 温](https://appshunter.io/developer/434121952)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 3.50/5 from 8 App Store ratings · 26 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 21 MB
- Languages: American English
- Released: 2013-08-02
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/iformula-your-own-calculator/id665486714/reviews.md

## What is iFormula?

Tired of inputing same formula on digital calculator again and again? 
Enjoy the cool feature of Microsoft Office Excel - input a formula once, and reuse it any time by changing formula fields' value? 
Yes, iFormula provides the feature.

With iFormula, you can:
- save you plenty of time to do calculation and remember formulas
- import powerful calculators by one click
- build any types of calculators in one minute - with the intuitive but powerful formula editor, you can build your own calculator so fast
- share your calculators and its result with your friends 

Please watch demo on YouTube: https://youtu.be/_haYnfGS5ac

Should you have any question please contact stickto@gmail.com

## Key features

- Save and reuse custom formulas
- Intuitive formula editor
- Import pre-built calculators
- Share calculators and results
- Build calculators quickly

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| iFormula Pro | $9.99 | one-time |


## Recent user reviews (10 of 26)

All indexed reviews: https://appshunter.io/ios/app/iformula-your-own-calculator/id665486714/reviews.md

### 4/5 — Good but needs extra fx’s. Too basic.

*2023-04-20*

It’s a good app, but I cannot find a way of converting decimal hours to hours and minutes. H.dd to HH:MM. Needs a D:M:S option.

### 5/5 — Best app on my phone

*2022-12-25, version 3.0.0*

I use it 5 days a week but update will not download

### 5/5 — Simple, easy and intuitive

*2019-04-06, version 2.5*

Perfect for constantly using simple custom formulas with minimum of keystrokes

### 5/5 — Best Application

*2019-02-28, version 2.5*

this is the best app i have in my phone! kudos to the publisher!

### 5/5 — Good app for custom Formulas

*2018-06-11*

I purchased this app because I am in the directional drilling industry. I was able to write some of the common formulas that I use every day into it and so far it is working great! 

Anyone who uses angles like co-sign, sine and tangent formulas should know you have to write the angle and then convert to radiaons. Us tang(angle*PI/180) it’ll work well. 

Very good so far and exactly what I needed. A variable based formula saver.

### 1/5 — Not ready

*2017-12-21*

Formulas can be created, but not functional.

### 1/5 — Extremely annoying

*2016-12-09*

I was using this app and THREE things made be delete it. 1. It asks a bunch of stuff at the beginning and even to upgrade to v 2.5. Wouldn't we already have that? 2. The question mark tells you how to make a formula, but you can't get out causing you to have to get out of the app and get back on, WHICH CAUSES YOU TO LOSE ALL OF YOUR PROGRESS. 3. The formula maker only shows 1 input field/constant field. Not helpful at all. Please fix this stupid app.

### 5/5 — Perfect

*2016-11-04*

Does everything you need to write your own formulas.

### 1/5 — Buggy

*2016-05-15*

Buggy, fix updates

### 1/5 — Horrible

*2016-05-14*

This was a five star app until the latest update. The redesigned UI is terrible, clumsy, and confusing. 
It won't let me restore my purchase to remove ads. 
It deleted all the custom formula calculators I made using the previous version. It's useless now. 
Please fix it...like it was!!

## Frequently asked questions about iFormula

### How does iFormula save me time?

iFormula allows you to input a formula once and save it. You can then reuse this saved formula by simply changing the input values, eliminating the need to re-enter complex calculations repeatedly.

### Can I create my own calculators with iFormula?

Yes, iFormula features an intuitive yet powerful formula editor that enables you to build any type of calculator quickly, often in under a minute.

### What is the rating of iFormula?

iFormula has a rating of 3.5 stars based on 8 user ratings.

### Is iFormula available on Android?

Based on the provided data, iFormula is available on iPhone, iPad, and iPod. Information regarding Android compatibility is not available.

### How often is iFormula updated?

The latest version, 3.1.0, was last updated on January 21, 2023. This indicates a relatively infrequent update cycle.

### Can I share calculators I create with iFormula?

Yes, iFormula allows you to share your custom calculators and their results with your friends, facilitating collaboration and easy data sharing.

### What is the age rating for iFormula?

iFormula has an age rating of 4+, making it suitable for young children and up.

### Does iFormula have ads?

No, the application does not feature advertisements. It is free to download and use.

## Version history (last 5 releases)

### 3.1.0 — 2023-01-21

- New Features: Support synchronization between multiple devices via iCloud
- Bugfixes:  fail to save calculator position; calculator style not changed after rotating device

Happy Chinese New Year!

### 3.0.1 — 2023-01-11

- Bug fixes: blank page shown for few calculators; ln function not working
- New features: support constant field; add reset button to clear all inputs

### 3.0.0 — 2022-12-20

- Rewrite the whole app to fit new ios version, and provide better user experience
- Introduce library so user can import calculator by one click
- Share calculator and result to friends

### 2.5 — 2016-07-03

fix crash of new installation

### 2.4 — 2016-06-29

- Solve flickering issue
- Tap field name to show formula

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## More apps by 建华 温

- [jDisk -  Convert Your Device to a Wireless Flash Drive with File Viewer](https://appshunter.io/ios/app/jdisk-convert-your-device-to-a-wireless-flash-drive-with-file-viewer/id604793088)

All apps by 建华 温: https://appshunter.io/developer/434121952

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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 2026-06-10.*