This is the simplest app to make your time calculations. Install and open the app and start to add and subtract days, hours, minutes and seconds. What date-time will be in the next 23 days 13 hours 15 minutes?. Press the "Now" button and add the days, minutes, hours and seconds you want. You don't need to configure anything.

Other things you can do:
- How many minutes are 280 seconds?. Type 280s and press twice the "=" sign. You will get 4m 40s
- How many time has passed from 9:23 AM yo 2:32 PM?. Type 14h32m - 9h23m and you will get 5h 9m 0s
- Press the calendar button to add and subtract days, hours, minutes and seconds to any date
- Store answers in memory
- Save reminders and calendar events just from within the app

What's New

Version 3.2

- Updated for iOS 11
- “Dot button” is not anymore disabled when you press “x” or “÷” button.
- UI enhancements

Ratings and Reviews

Good app for calculating film development time


There’s one bug though: you can’t make a calculation with a number starting with a decimal.

For example, I need to purposely underdevelop a roll of film by 40%, so (N x .6) where N= the base time I’d use to properly develop a roll, in this case 7 minutes. So in the app I want to type "7m x .6” but it won’t let me enter the “.” . A workaround is to type “7mx6⬅️.6” where ⬅️ is the backspace. It then properly shows the formula at the top like so:

7m x .6=

Fix that and I’ll upgrade my rating to 5 stars :)

Almost the tool

Moyocoyatzin Hda

Best application I found after purchasing and trying so many. I have these suggestions:

1) Application doesn't offer any help to understand functions.

2) Application doesn't give an option to write concerns to developer.

3) Sometimes calculations are way off.

4) No way to post an event in the calendar that will reoccur every x days, x hours, x minutes, x seconds as calculated by the app.

Still it is the best and I hope the developer reads my suggestions.

Outstanding Product!


So happy it was updated.


Teofilo Israel Vizcaino Rodriguez
2.5 MB
Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, French, German, Italian, Portuguese, Russian, Simplified Chinese, Spanish
Age Rating
Rated 4+
© Teofilo Vizcaino


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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