Time Calculator
Free Time Calculator - Add & Subtract Time
Calculate time duration, add time, subtract time, and find time differences with LaunchIdea.
Add two time periods together
💡 Quick Tips:
- • Enter values in days, hours, minutes, and seconds
- • Leave fields blank or enter 0 if not needed
- • Use "Add" to combine time periods
- • Use "Subtract" to find remaining time
- • Use "Difference" for absolute time gap
Enter time values to calculate
Add, subtract, or find time differences
Why Use a Time Calculator?
A time calculator is an essential tool for anyone who needs to work with time durations. Whether you're planning a project, tracking work hours, scheduling events, or calculating travel time, our free time calculator makes complex time calculations simple. Add time periods together, subtract time to find remaining durations, or calculate the exact difference between two time periods - all with precision down to the second.
Add Time
Combine multiple time periods together to calculate total duration.
Example:
2h 30m + 1h 45m = 4h 15m
- Project time planning
- Total work hours
- Combined travel time
Subtract Time
Calculate remaining time by subtracting one period from another.
Example:
5h 30m - 2h 15m = 3h 15m
- Time left in project
- Break time calculation
- Deadline countdown
Time Difference
Find the absolute difference between two time periods.
Example:
|8h 30m - 5h 15m| = 3h 15m
- Duration comparison
- Time gap analysis
- Schedule differences
Common Time Calculations
Real-world examples of time calculations you can perform.
| Scenario | Calculation | Type | Use Case |
|---|---|---|---|
| Total work hours | 8h 30m + 7h 45m + 9h 15m | Addition | Weekly timesheet |
| Time until deadline | 120h - 45h 30m | Subtraction | Project management |
| Travel duration | 2h 30m + 45m + 1h 15m | Addition | Trip planning |
| Meeting overlap | |14:00-16:00| vs |15:30-17:00| | Difference | Schedule conflict |
| Break time left | 1h - 23m | Subtraction | Lunch break |
| Video total length | 12m 30s + 8m 45s + 15m | Addition | Content creation |
How to Use the Time Calculator
- Select calculation type (Add, Subtract, or Difference)
- Enter the first time period (days, hours, minutes, seconds)
- Enter the second time period
- Leave any field blank or enter 0 if not needed
- Click "Calculate Time" to see results
- View results in multiple formats (days, hours, total seconds, etc.)
- Use "Swap Times" to reverse the order if needed
Understanding Results
- Days, Hours, Minutes, Seconds: Standard time format
- Total Seconds: Entire duration in seconds
- Total Minutes: Entire duration in minutes
- Total Hours: Entire duration in hours (decimal)
- Total Days: Entire duration in days (decimal)
- Negative Results: Shown when subtracting larger from smaller
- Calculation Details: Shows step-by-step breakdown
Time Conversion Reference
⏱️ Time Units
📊 Quick Conversions
Convert hours to minutes:
Multiply by 60
Example: 2.5 hours = 2.5 × 60 = 150 minutes
Convert minutes to hours:
Divide by 60
Example: 90 minutes = 90 ÷ 60 = 1.5 hours
Convert days to hours:
Multiply by 24
Example: 3 days = 3 × 24 = 72 hours
Convert seconds to minutes:
Divide by 60
Example: 300 seconds = 300 ÷ 60 = 5 minutes
Practical Applications
Work & Business
- • Calculate total billable hours
- • Track project time budgets
- • Compute overtime hours
- • Plan meeting schedules
- • Estimate task durations
- • Calculate break times
Travel & Events
- • Plan trip durations
- • Calculate layover times
- • Coordinate time zones
- • Schedule event timings
- • Estimate driving time
- • Plan arrival times
Media & Content
- • Add video clip lengths
- • Calculate podcast duration
- • Plan content schedules
- • Track editing time
- • Measure stream length
- • Schedule uploads
Fitness & Sports
- • Track workout duration
- • Calculate race times
- • Compare performance
- • Plan training sessions
- • Measure rest periods
- • Log exercise time
Education & Study
- • Plan study sessions
- • Track exam time left
- • Calculate homework hours
- • Schedule class time
- • Measure reading time
- • Organize study breaks
Daily Life
- • Cook timing calculations
- • Sleep time tracking
- • Chore scheduling
- • Commute planning
- • Baby feeding intervals
- • Medication reminders
Frequently Asked Questions
How do I add times that exceed 24 hours?
Our calculator automatically handles times exceeding 24 hours. You can enter values in days, or if your hours exceed 23, the result will show the correct number of days, hours, minutes, and seconds. For example, 30 hours will display as 1 day, 6 hours.
What does a negative result mean?
A negative result in subtraction means the second time period is larger than the first. For example, 2 hours - 3 hours = -1 hour. If you need a positive result, use the "Difference" calculation instead, which always gives the absolute difference.
Can I calculate time across midnight?
Yes! If you're calculating time that spans midnight (like 11:00 PM to 2:00 AM), enter the duration in hours. For 11 PM to 2 AM, that's 3 hours. You can also use the days field if the time spans multiple days.
How accurate is the time calculator?
Our time calculator is 100% accurate down to the second. It properly handles all time conversions and accounts for overflow (when seconds become minutes, minutes become hours, etc.). All calculations are precise and instant.
Do I need to fill in all fields?
No, you only need to fill in the fields that are relevant to your calculation. If you're only working with hours and minutes, leave days and seconds blank or enter 0. The calculator will work with whatever values you provide.
Can I use this for clock times (AM/PM)?
This calculator works with time durations (periods of time), not clock times. To calculate the difference between 9:00 AM and 5:00 PM, you would enter 8 hours. For more complex clock time calculations, consider the time between those clock times.
Calculate Time Instantly!
Make time calculations easy with our free time calculator. Add, subtract, or find differences in seconds.