The simplest and most powerful way to calculate time ⏱️

ChronoCalc Pro is a time calculator for iPhone and iPad. Add, subtract, multiply and divide hours, minutes and seconds, see the result while you type, and switch to decimal hours with one tap. Perfect for pilots, freelancers, consultants and anyone who needs to add up hours with precision.

Screenshots

The first four screenshots are from iPhone, the last four from iPad.

ChronoCalc Pro on iPhone - 1h45m + 2h30m + 50m gives a large, saved result of 5h 5m, with the latest results above
ChronoCalc Pro on iPhone - live preview of 7:45 + 8:15 + 6:30 = 22h 30m while typing, before tapping =
ChronoCalc Pro on iPhone - the question "What does a comma mean?": 7,5 as 7h 30m (decimal hours) or 7h 5m (hours and minutes)
ChronoCalc Pro on iPhone - a clear error message explaining that two times can't be multiplied, with a hint to use a number like × 2
ChronoCalc Pro on iPad - the result 5h 5m next to a history panel grouped by day
ChronoCalc Pro on iPad - live preview of 7:45 + 8:15 + 6:30 = 22h 30m while typing, before tapping =
ChronoCalc Pro on iPad - the question "What does a comma mean?": 7,5 as 7h 30m (decimal hours) or 7h 5m (hours and minutes)
ChronoCalc Pro on iPad - a clear error message explaining that two times can't be multiplied, with a hint to use a number like × 2

Key Features

  • Time math: Add, subtract, multiply and divide times without thinking about 60 minutes to the hour
  • Live preview: See the result as you type, then tap = to save it
  • Enter time your way: 1h30m, 1:30 or with a comma. The first time you type a comma, you choose what it means: 7,5 as 7h 30m (decimal hours) or as 7h 5m (hours and minutes)
  • Decimal hours: Switch between 1h 30m and 1.50 hrs right next to the result, with one or two decimals
  • Seconds: Type and see seconds, such as 2h 15m 20s, and negative times
  • History: Your last 100 calculations, one tap to reuse a result. On iPad, a full-height panel grouped by day. Delete single entries or clear it all
  • Clear error messages: Plain-language hints show what went wrong and which line to fix
  • CSV import and export: Import time logs or export your history, with comma, semicolon or tab. Duration columns are recognised in all seven languages
  • Quick copy: Copy the result with a single tap
  • Made for iPhone and iPad: Layouts for portrait and landscape, with Liquid Glass on iOS 26
  • Accessible: VoiceOver reads times in whole words and announces every result. Keys support the Large Content Viewer, and animations respect Reduce Motion

In English, Norwegian, Swedish, Danish, German, French and Spanish, with a language picker in the app.

Perfect For

  • Pilots: logging flight hours and calculating block time
  • Freelancers and consultants: tracking billable hours
  • Project managers: calculating project durations
  • Anyone: adding up timesheets and converting time formats

Free

ChronoCalc Pro is free, and every feature is included. No ads, no in-app purchases, no subscription and no account. Your calculations never leave your device unless you export them yourself.

Download

Download ChronoCalc Pro on the App Store

Requires iOS 17 or iPadOS 17 or later.

Support and Contact

ChronoCalc Pro - Time calculations made easy!