# Calendar Calculator Free

> Business day calculator with custom calendars and iOS calendar integration. (iPhone/iPad app by Hiroyuki KATOH.)

- Source: https://appshunter.io/ios/app/calendar-calculator-free/id961898122 (this page in markdown: same URL + `.md`)
- Developer: [Hiroyuki KATOH](https://appshunter.io/developer/898546586)
- Category: Business, Utilities
- Price: Free
- Rating: 1.00/5 from 1 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 20 MB
- Languages: American English, Japanese
- Released: 2015-02-04
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/calendar-calculator-free/id961898122/reviews.md

## What is Calendar Calculator Free?

“I am supposed to have more one day!” Have you ever thought such a thing?
We often count the days with concerning for a schedule, but it may be often difficult because of holidays, irregular days off, individual plans, and so on.
This App makes such difficult calculation easy and accurate with iPhone, iPod and iPad that we carry always.
That’s why we designed new App “Calendar Calculator”.

How many holidays can we use for preparing our wedding party?
When will I get the wages for 10 days working?
When shall we start the duty of 10 days until the deadline?
How many days should I work until the Xmas?
…
- This App will answer such a question easily and quickly.
- This App will be very useful in various situations.
- Please try Calendar Calculator!

#Notice
- This App is the free trial version of Calendar Calculator App. Max number of calendar in this free trial version is 3, and the advertising will appear after each calculation. When advertisings are unavailable, calculations in this App also become unavailable. There are no limitations in the normal version.

#Main features
 This App can calculate in three ways mentioned below.
- To get the number of either working or non-working days with inputting the dates of start and end.
- To get the date of end with inputting the date of start and the number of either working or non-working days.
- To get the date of start with inputting the date of end and the number of either working or non-working days.

For the calculation, Calculator needs the calendar in which working and non-working days are scheduled.
At the first time installing, this App has sample calendars. They will help you to know how to use this App.

#Strong Point
- However there are a table calculation software to be able to count business days (Monday to Friday),  there are no calculation software or App to be able to calculate with individual scheduled calendar (at September 10, 2014, according to our own research).
- You can create calendars for calculation very easily, and there are no limits for calendars.
- You can import events as either working or non-working days from iOS calendars.
- You can easily change the states of working or non-working days with tapping each days on the calendar.
- You can customize the color setting, and can make a note on each days.
- You can organize this App with URL scheme (jp.37.CalendarCalculator://) in other Apps such as launchers.
- This App (from ver.1.2.0) is just designed for iPhone and iPad with iOS8.

# Disclaimer
- Please check carefully End User License Agreement (EULA) before using the App.
- Additionally, you may not use this App unless you agree to terms included below.
- You agree to assume full and sole responsibility for any use of this App.
 We are not responsible for any damages or injury, including but not limited to special or consequential damages, that result from your use of (or inability to use) this App, including any damages or injury caused by any failure of performance, error, omission, interruption, defect, delay in operation, computer virus, or other computer malfunction.

## Key features

- Calculate working/non-working days
- Determine end date from start date and duration
- Determine start date from end date and duration
- Create custom calendars
- Import events from iOS calendars
- Customize calendar colors and notes
- Organize with URL scheme

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/calendar-calculator-free/id961898122/reviews.md

### 1/5 — Clunky

*2020-06-21*

This is the most clunky app I have ever used.

Try to change dates.    No it just resets
Then if you turn day off.    On or off    It then let’s you change the date.
If you don’t delete the pre entered schedules it doesn’t let you change the dates at all.
And you want money for this you shouldn’t have ads or a fee it needs to be free for the lack of effort you’ve put in...

### 1/5 — Useless

*2020-02-01*

Free version is designed for 2037 calendar. Sampe calculations come with pop up “loading advertisement” never actually shows you the result. Complete waste of time. I wasted mine so you shouldn’t

### 1/5 — .

*2019-05-06*

Sh*t waste of my time

### 1/5 — Useless and outdated

*2018-12-06, version 1.5.4*

Only support 2037 and 2038 and doesn't support iPhone X screen.

### 1/5 — App for the future? Like the year 2037

*2016-04-01, version 1.5.4*

No matter what I try, the app refuse to move the date range to this decade. So, if this app is still around in twenty one years, I'll give it a go....

## Frequently asked questions about Calendar Calculator Free

### How does Calendar Calculator Free calculate days?

Calendar Calculator Free allows you to input start and end dates to find the number of working or non-working days. It can also determine an end date given a start date and a duration, or a start date given an end date and a duration.

### Can I use my own holidays with Calendar Calculator Free?

Yes, you can create custom calendars where you define working and non-working days. You can also import events from your iOS calendars to be recognized as working or non-working days.

### What devices support Calendar Calculator Free?

Calendar Calculator Free is designed for iPhone, iPad, and iPod touch devices running iOS 8 or later.

### Is Calendar Calculator Free suitable for all ages?

The app has an age rating of 4+, making it suitable for a wide range of users. It is designed for business and scheduling purposes.

### How often is Calendar Calculator Free updated?

The latest version is 1.5.4, and it was last updated on March 27, 2015. Updates typically include bug fixes and feature enhancements.

### What is the user sentiment for Calendar Calculator Free?

The app has a rating of 1.0 stars from 1 rating, indicating a very low user satisfaction based on available data.

### Does Calendar Calculator Free have ads?

The description states that this is a free trial version where advertising will appear after each calculation. However, the provided data indicates 'hasAds' is false, suggesting the full version may be ad-free or the data is outdated.

### Can I integrate Calendar Calculator Free with other apps?

Yes, the app can be organized with a URL scheme (jp.37.CalendarCalculator://), allowing integration with other applications like launchers.

## Version history (last 4 releases)

### 1.5.4 — 2015-03-27

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

- The issue with third-party custom keyboard fixed.

### 1.5.3 — 2015-03-12

- A sample calendar became to be selected at first boot.
- “Contact Me” was prepared at the Information of this App (at the left upper button of the first screen).

### 1.5.1 — 2015-02-13

- Design of number keypad was modified.
- Slightly modification of internal cords.

### 1.3.2 — 2015-02-04

No release notes.

## Apps similar to Calendar Calculator Free

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [TextSpeak Notify!](https://appshunter.io/ios/app/textspeak-notify/id1119159852) | 4.0 (4) | Free | Business |
| [Calend-it](https://appshunter.io/ios/app/calend-it/id6450831569) | — | Free | Business |

## More apps by Hiroyuki KATOH

- [EQD Calculator](https://appshunter.io/ios/app/eqd-calculator/id898546583)
- [TDF Calculator](https://appshunter.io/ios/app/tdf-calculator/id900087159)
- [Vertical Check Camera](https://appshunter.io/ios/app/vertical-check-camera/id967235607)
- [Musica Timer - Earphone Timer with Flexible Commands, Smart Input with a Numeric Keypad](https://appshunter.io/ios/app/musica-timer-earphone-timer-with-flexible-commands-smart-input-with-a-numeric-keypad/id983833338)

All apps by Hiroyuki KATOH: https://appshunter.io/developer/898546586

---

*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 2026-06-11.*