Time Calculator
Add or subtract two time durations in days, hours, minutes and seconds. Get the total in every unit instantly.
About the Time Calculator
Adding times by hand is awkward because there are 60 minutes in an hour and 24 hours in a day. This time calculator does the carrying for you: add or subtract two durations and get the answer in days, hours, minutes and seconds, plus the total in each single unit.
How to Use the Time Calculator
- Enter the first duration in days, hours, minutes and seconds.
- Choose Add or Subtract.
- Enter the second duration and press Calculate.
Formula and How It Works
Each duration is converted to seconds: total = days × 86,400 + hours × 3,600 + minutes × 60 + seconds. The two totals are added or subtracted and the result is converted back into days, hours, minutes and seconds.
Frequently Asked Questions
How do I add hours and minutes?
Enter both times in the fields above and choose Add. The calculator turns 75 minutes into 1 hour 15 minutes automatically.
Can the result be negative?
Yes. If you subtract a longer time from a shorter one, the result is shown with a minus sign.