Calculate time like numbers
Run addition, subtraction, multiplication, and division directly on hours, minutes, and seconds.
For iPhone, iPad, and Mac
Time Math Made Simple
A simple time calculator for adding, subtracting, comparing, converting, saving, and syncing hours, minutes, seconds, and dates without manual math.
Pilots
Shifts
Projects
iCloud Sync
Compare dates and times
Find the precise duration between two dates, with readable calendar breakdowns and unit totals.
Convert in seconds
Move between years, days, hours, minutes, seconds, decimal hours, and HH:MM:SS formats.
Save, share, and sync
Keep important calculations in history and sync them with iCloud across all your Apple devices.
Time calculation guides
Learn the math, then let TimeCalc do it faster.
Guide
How to calculate time
Add, subtract, multiply, and divide hours, minutes, and seconds without base-60 mistakes.
GuideHow to calculate time between dates
Use a date difference calculator workflow to find the duration between two dates and convert it into days, hours, minutes, or seconds.
GuideHow to add time to a date
Learn how to add time to a date, subtract time from a date, and calculate the resulting date and time.
GuideHow to convert decimal time
Convert decimal hours into HH:MM:SS, and convert clock-style time back into decimal hours.
Time calculator FAQ
Common time math questions.
How do I use a time calculator for hours, minutes, and seconds?
Convert each value to seconds, do the operation, then convert the result back to HH:MM:SS. TimeCalc does this automatically for add, subtract, multiply, and divide.
Learn moreHow do I use a date difference calculator?
Subtract the start date and time from the end date and time. The result can be shown as calendar units or total days, hours, minutes, and seconds.
Learn moreHow do I add or subtract time from a date?
Start with a date and time, enter an offset such as 2 hours or 30 minutes, then add or subtract it to get the resulting date.
Learn moreHow do I convert decimal hours to HH:MM:SS?
Use the whole number as hours, multiply the decimal part by 60 for minutes, and convert the remaining decimal to seconds.
Learn moreScreenshots
Built for quick checks and serious time work.
Every Apple screen
One workflow across iPhone, iPad, and Mac.
Use the focused phone calculator when you are on the move, the wide iPad layout for repeated entries, and the Mac sidebar when you need a desktop utility beside your work.
TimeCalc Pro
Free trial included.
Unlock unlimited time operations, saved results, export and sharing tools, iCloud sync, and an ad-free experience.
- 3-day free trial
- Weekly or annual plans
- Cancel anytime
Try TimeCalc today.
Accurate time math for daily work, flight logs, schedules, planning, and everything measured in hours, minutes, or seconds.
