# Dual Display Calculator - Simple and Easy-to-use

> Dual display calculator with advanced calculation and rounding features. (iPhone/iPad app by Takahiro Kusano.)

- Source: https://appshunter.io/ios/app/dual-display-calculator-simple-and-easy-to-use/id1120989361 (this page in markdown: same URL + `.md`)
- Developer: [Takahiro Kusano](https://appshunter.io/developer/1114414985)
- Category: Utilities, Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 27 MB
- Languages: American English, Japanese
- Released: 2016-07-05
- Data updated: 2026-07-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/dual-display-calculator-simple-and-easy-to-use/id1120989361/reviews.md

## What is Dual Display Calculator?

This calculator can display two results.
You can switch easily between two displays.
Please forget about the old memory function.

Features:
- Input digit number 12 digits
- Percent calculation
- Constant calculation
- Decimal rounding
Rounding, rounding up, you can choose from truncation
- Point selector
Can of digits to the right of the specified point (4/3/2/1/0)
- +/- (Sign change)
- Shift
- Square root etc.
- Calculation result history

- Slide Switch(Rounding)
F: Floating Decimal
CUT: Values are cut off to the number of decimal places specified by the current Decimal Place Selector setting
UP: Values are rounded up to the number of decimal places specified by the current Decimal Place Selector setting
5/4: Values are rounded off (0,1,2,3,4 are cut off; 5,6,7,8,9 are rounded up) to the number of decimal places specified by the current Decimal Place Selector setting
4,3,2,1,0: Specifies the number of decimal places as 4,3,2,1,0

- Percent Calculation
Adding 10%: 1000 [×] 10 [%] [+]
Subtract 10%: 1000 [×] 10 [%] [-]

1000+10%: This is a markup on price procedure. The formula is as follows:
Markup%=(Markup Price-Cost)/(Markup Price)

- Constant Calculation
Press "+", "-", "×", "÷" twice to register a constant. The "K" indicator is displayed to indicate that Constant Calculation is in effect. This will reverse the order of the input values, for example, if you input 4--3, the result of the constant calculation will be 3-4.

* There is some paid content

## Key features

- Dual display for simultaneous results
- Easy display switching
- Percent calculation
- Constant calculation
- Flexible rounding options (CUT, UP, 5/4)
- Decimal point selection
- Calculation history

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/dual-display-calculator-simple-and-easy-to-use/id1120989361/reviews.md

### 5/5 — Excellent Dual Calculator Application

*2021-09-07*

This is a very good dual calculator application which provides better functionality than the native iOS calculator application.

### 5/5 — Great!!

*2017-05-03*

Nice & simple. Just what I was looking for😁 Thank you!

## Frequently asked questions about Dual Display Calculator

### What is the main advantage of Dual Display Calculator?

The primary advantage is its dual display capability, allowing users to see two results simultaneously and switch between them easily. This eliminates the need for a traditional memory function and streamlines complex calculations.

### Does Dual Display Calculator have ads?

No, Dual Display Calculator is ad-free, providing an uninterrupted user experience for all its calculation features.

### What types of rounding does Dual Display Calculator support?

Dual Display Calculator offers several rounding options, including Floating Decimal (F), truncation (CUT), rounding up (UP), and standard rounding (5/4). It also allows precise selection of decimal places.

### How does the constant calculation feature work in Dual Display Calculator?

Constant calculation is activated by pressing an operator (+, -, ×, ÷) twice. A 'K' indicator appears, and the app uses the last entered number as a constant for subsequent operations, reversing the input order for operations like subtraction.

### What is the age rating for Dual Display Calculator?

Dual Display Calculator has an age rating of 4+, making it suitable for a wide range of users, including children and adults.

### On which devices can I use Dual Display Calculator?

Dual Display Calculator is available for iPhone, iPad, and iPod devices, offering its dual-display functionality across Apple's mobile ecosystem.

### How often is Dual Display Calculator updated?

The app was last updated on June 7, 2017, with version 1.1.10. While updates have not been frequent recently, the existing features are stable and functional.

### What is the user sentiment for Dual Display Calculator based on ratings?

Dual Display Calculator has received an exceptional rating of 5.0 stars from 1 rating, indicating a highly positive user experience for those who have reviewed it.

## Version history (last 5 releases)

### 1.1.10 — 2017-06-07

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

- Miner Bug Fixes
- Library updated

### 1.1.9 — 2017-04-24

- Fixed bug in percent calculation

### 1.1.8 — 2017-04-19

- Library updated

### 1.1.7 — 2017-02-13

- Miner Bug Fixes

### 1.1.6 — 2017-01-17

- Miner Bug Fixes

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## More apps by Takahiro Kusano

- [Date & Time Calculator - Quick and Simple](https://appshunter.io/ios/app/date-and-time-calculator-quick-and-simple/id1114414986)
- [Desktop Calculator C - Excellent & Convenient](https://appshunter.io/ios/app/desktop-calculator-c-excellent-and-convenient/id1118457662)

All apps by Takahiro Kusano: https://appshunter.io/developer/1114414985

## Related topics

[dual display](https://appshunter.io/ios/topics/dual-display)

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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 2026-07-04.*