Time Calculator – Add, Subtract, and Convert Time Easily
Add, subtract, and convert time with ease. Calculate durations, time differences, and more.
Time Operations
Add or Subtract Time
Calculate a new time by adding or subtracting hours, minutes, and seconds from a starting time.
Calculate Duration
Find the duration between two times or dates.
Time Difference
Calculate the difference between two times.
Time Conversion
Convert Between Time Units
Convert time between different units like hours, minutes, seconds, days, and weeks.
Calculation History
Time Calculator: A Free Online Tool for 2025
You can quickly and accurately add, subtract, or find the time between two dates and timings.
How many hours have you worked, when a project is due, or the time difference?
No matter if you’re keeping track of shifts, planning events or doing homework, our Time Calculator makes maths easy.
✅ Add or take away hours, minutes, and seconds
✅ Please find out how long it is between two times or dates
✅ Supports both 12-hour and 24-hour formats
✅ No adverts or signups
[Calculate Time Now]
What is the point of a time calculator?
- Keep track of your work hours for payroll or freelance
- Plan activities with exact times for when they start and terminate
- Do maths problems that have to do with time for school or logistics
- Avoid making mistakes when adding or subtracting time
🔗 For a thorough study of the date and time difference, use our Date Difference Calculator .
🔗 Pair with our Time Zone World Clock to manage cross-timezone scheduling.
Three Steps to Make It Work
- Put in the time you want to start (for example, 9:30 AM)
- Type in the end time or the time to add or subtract
- Get the results right away:
- Time: 7 hours and 45 minutes
- Or the new time is 4:15 PM
✅ No need to log in
✅ Works on both mobile and desktop
✅ Results in less than two seconds
Main Features
- 100% No hidden fees
- No registration – Use right away
- Time and Date Support: If you need to, you can calculate across days
- 12h/24h Format – Matches What You Like in Your Area
- First, privacy – No data saved or tracked
Questions and Answers
Q: Is this a free Time Calculator?
A: Yes, it’s completely free, you don’t have to log in, and you can use it as many times as you like.
Q: Can it figure out how long things will last overnight?
A: Yes, add dates or turn on “cross-day” mode.
Q: Does it work on phones?
A: Yes, it works perfectly on both iPhone and Android.
Q: Is my information safe?
A: Yes. Your browser does all the maths, and nothing is saved.
Try the greatest Time Calculator of 2025. It’s free, quick, and necessary for managing your time.
[Do My Time Now]
🔗 Reference: For best practices on time tracking and productivity, see U.S. Office of Personnel Management – Time & Attendance Guidelines .