Lifestyle & Sleep
Time Calculator
Add up workout segments, flight times, or work logs, hours, minutes, and seconds, with carry-over handled correctly.
A time calculator adds or subtracts hours, minutes, and seconds, handling carry-over between units — for example 1:45 plus 2:30 equals 4:15. It also converts total seconds into hours, minutes, and seconds. Use the result as a planning estimate; individual circumstances vary.
Handles carry-over automatically.
Add or subtract modes.
Total-seconds conversion included.
Calculate Your Time
Result
What Is Time?
Time arithmetic is base-60, which is why 1:45 + 2:30 trips up mental math. The calculator normalizes everything to seconds, adds or subtracts, then re-splits into hours, minutes, and seconds.
Useful for workout logs, travel times, cooking, timesheets, and media durations.
How It Is Calculated
Total seconds = (A ± B), then split into hours, minutes, seconds
Example: Example: 1:45:00 + 2:30:00 = 4:15:00 (15,300 seconds)
Conversions
| Unit | Seconds |
|---|---|
| 1 minute | 60 |
| 1 hour | 3,600 |
| 1 day | 86,400 |
| 1 week | 604,800 |
Limitations
- Inputs above 59 in minutes/seconds are normalized by the UI; hours can be any size.
- For date+time spans (crossing midnight), use the date calculator instead.
Sources & Review
References used for this calculator’s formulas and thresholds:
Time FAQ
How do I add hours and minutes?
Add hours, add minutes, and carry every 60 minutes into 1 hour, or let the calculator handle the base-60 math.
How do I convert minutes to hours?
Divide by 60: 90 minutes = 1.5 hours.
What is 1.5 hours in minutes?
90 minutes, multiply hours by 60.
Why does my timesheet use decimal hours?
Payroll multiplies decimal hours by the hourly rate: 7 h 45 min = 7.75 h.
Please read this first: these results are educational estimates. For real decisions, talk to a qualified professional.