Duration Calculator
Calculate time duration between dates, add or subtract time periods, and compute work hours. Perfect for project planning, billing, and time management.
Duration Settings
Duration Timeline
Duration Comparison
| Duration | Seconds | Minutes | Hours | Days | Weeks |
|---|
Project Planning Tip
A 24-hour duration equals 1 work day (8 hours) plus 16 non-work hours. Consider scheduling tasks within work hours for better productivity.
About Duration Calculation
The Duration Calculator helps you calculate time differences between dates, add or subtract time periods, and compute work hours. Essential for project planning, billing, scheduling, and time management.
How Duration Calculations Work
Time Between Dates
Duration = End DateTime - Start DateTime
Calculates total time difference in various units
Add/Subtract Time
Result Date = Start Date ± Duration
Adds or subtracts specified time period
Work Hours Calculation
Excludes non-work hours, weekends, and holidays
Considers customizable work schedules
Business Days
Excludes weekends and specified holidays
Standard: Monday to Friday, excluding holidays
Common Duration Equivalents
| Duration | Seconds | Minutes | Hours | Days | Business Days |
|---|---|---|---|---|---|
| 1 Minute | 60 | 1 | 0.0167 | 0.0007 | 0.0003 |
| 1 Hour | 3,600 | 60 | 1 | 0.0417 | 0.125 |
| 8 Hours (Work Day) | 28,800 | 480 | 8 | 0.3333 | 1 |
| 1 Day | 86,400 | 1,440 | 24 | 1 | 1.2 |
| 1 Week | 604,800 | 10,080 | 168 | 7 | 5 |
| 1 Month (Avg) | 2,629,800 | 43,830 | 730.5 | 30.44 | 21.74 |
| 1 Year (Avg) | 31,557,600 | 525,960 | 8,766 | 365.25 | 260.89 |
Work Hours & Business Days
Standard Work Week
- Days: Monday to Friday
- Hours: 9:00 AM to 5:00 PM
- Daily: 8 hours
- Weekly: 40 hours
- Monthly: ~160 hours
- Yearly: ~2,080 hours
Common Holidays
- New Year's Day (Jan 1)
- Good Friday (Varies)
- Easter Monday (Varies)
- Labor Day (May 1)
- Christmas Day (Dec 25)
- Boxing Day (Dec 26)
Calculation Methods
- 24/7: All hours included
- Business Hours: Work schedule only
- Business Days: Excludes weekends/holidays
- Custom: Your specific schedule
Practical Applications
Project Management
Calculate project timelines, deadlines, and task durations. Track progress against scheduled completion dates.
Billing & Invoicing
Calculate billable hours for clients, contractors, and service providers. Track time spent on different projects.
Employee Time Tracking
Calculate work hours, overtime, leave balances, and attendance. Essential for payroll processing.
Event Planning
Schedule events, calculate setup/teardown times, and plan overlapping activities efficiently.
Duration Calculation Examples
| Scenario | Start | End/Duration | Result | Work Hours |
|---|---|---|---|---|
| Standard Work Day | Mon 9:00 AM | Mon 5:00 PM | 8 hours | 8 hours |
| Weekend Period | Fri 5:00 PM | Mon 9:00 AM | 64 hours | 0 hours |
| Project Timeline | Jan 1, 9:00 AM | Jan 15, 5:00 PM | 14 days, 8 hours | 80 hours |
| Add Business Days | Mon 9:00 AM | +5 business days | Mon 9:00 AM | 40 hours |
Time Management Tips
- Buffer Time: Always add 10-20% buffer to estimated durations for unexpected delays
- Prioritize Tasks: Use duration calculations to prioritize time-sensitive tasks
- Batch Similar Tasks: Group similar tasks to minimize context switching time
- Track Actual vs Estimated: Compare estimated vs actual durations to improve future estimates
- Consider Time Zones: For global teams, account for different time zones in scheduling
- Include Breaks: Account for breaks and transition time between tasks
- Use Milestones: Break large projects into smaller milestones with their own durations