# One Hand Simple Calculator — Simple calculator for one hand

> One-handed adjustable calculator with history and memo features. (iPhone/iPad app by Shigeo Fukuda.)

- Source: https://appshunter.io/ios/app/one-hand-simple-calculator/id1527524512 (this page in markdown: same URL + `.md`)
- Developer: [Shigeo Fukuda](https://appshunter.io/developer/1282972116)
- Category: Utilities, Lifestyle
- Price: Free with in-app purchases
- Rating: 4.70/5 from 30 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 41 MB
- Languages: American English, Japanese
- Released: 2020-08-14
- Data updated: 2026-09-09
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/one-hand-simple-calculator/id1527524512/reviews.md

## What is One Hand Simple Calculator?

It is a simple calculator app that can be operated with one hand.

By moving the calculator key to the left or right, the problem that the button on the opposite side was too far and the thumb could not reach was solved.
You can also move the calculator key to the left or right with one touch, whether you hold it with your right or left hand.

Main function
・All buttons can be reached with one hand by moving the calculator keys to the left and right
- Calculator key size adjustable
- Visualization of calculation formulas on the way
- Calculation results and formulas can be saved in history with one tap
- Simple specifications without special calculation buttons
- A variety of theme colors available

There is also a simple memo field that can be used when you want to temporarily remember the calculation results.

Perfect when you want to use the calculator with only one hand, such as holding a shopping cart at a store, holding a hanging leather on a train, etc.!

The calculator key is easy to use because it has a central position with spaces on both sides, so please give it a try.

## Key features

- One-handed operation with adjustable key placement
- Adjustable calculator key size
- Formula visualization
- Calculation history saving
- Simple memo field
- Theme color customization

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/one-hand-simple-calculator/id1527524512/reviews.md

### 4/5 — 使ってみて思った事……

*2026-02-05*

履歴から出し引きできるようになりませんか？
あと数字を連打してしまった時に強制解除できるボタンが欲しいです

## Frequently asked questions about One Hand Simple Calculator

### How does One Hand Simple Calculator help with one-handed use?

One Hand Simple Calculator allows you to move calculator keys to the left or right. This ensures that buttons are within easy reach of your thumb, solving the problem of buttons being too far away when operating with a single hand.

### Can I change the size of the buttons on One Hand Simple Calculator?

Yes, the app features adjustable calculator key sizes. This allows you to customize the buttons to your preference for better usability.

### Does One Hand Simple Calculator show the calculation formula as I type?

Yes, the app provides visualization of calculation formulas as you input them. This helps you keep track of your calculations in real-time.

### How can I save my calculations with One Hand Simple Calculator?

Calculation results and formulas can be saved in the history with a single tap. This makes it easy to refer back to previous computations.

### Does One Hand Simple Calculator have ads?

Yes, this app contains advertisements. It is supported by ads to provide its features for free.

### What devices is One Hand Simple Calculator available on?

One Hand Simple Calculator is available for iPhone and iPod. It is designed for iOS devices.

### How often is One Hand Simple Calculator updated?

The latest version of One Hand Simple Calculator is 1.0.4, last updated on June 20, 2021. Updates typically address bug fixes and minor improvements.

### What is the age rating for One Hand Simple Calculator?

One Hand Simple Calculator has an age rating of 4+. This indicates it is suitable for children and general audiences.

## Version history (last 5 releases)

### 1.0.4 — 2021-06-20

- Fixed minor bugs.

### 1.0.3 — 2020-09-28

- Correspondence with iOS14.

### 1.0.2 — 2020-09-22

- When the application is started, it corresponds to continue the position of the previous number key.

### 1.0.1 — 2020-08-19

- Supports saving calculation results and formulas in history with one tap.
- Improved tap detection for calculator keys.

### 1.0.0 — 2020-08-14

No release notes.

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## More apps by Shigeo Fukuda

- [ColumnCalendar and Memo](https://appshunter.io/ios/app/columncalendar-and-memo/id1282972117)
- [Color Code Seeker](https://appshunter.io/ios/app/color-code-seeker/id1430895803)
- [mizutama Calendar](https://appshunter.io/ios/app/mizutama-calendar/id1465849545)
- [アニチェキ - アニメ視聴管理](https://appshunter.io/ios/app/id1475651553)
- [Body Temperature Memo](https://appshunter.io/ios/app/body-temperature-memo/id1508497110)
- [1day Schedule](https://appshunter.io/ios/app/1day-schedule/id1518450110)

All apps by Shigeo Fukuda: https://appshunter.io/developer/1282972116

## Related topics

[one hand simple calculator](https://appshunter.io/ios/topics/one-hand-simple-calculator)

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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 2026-09-09.*