Hours in Different Time Periods
| Description | Hours |
|---|---|
| Hours in a day | 24 |
| Hours in a week | 168 |
| Hours in a month |
672 for a 28-day month 696 for a 29-day month 720 for a 30-day month 744 for a 31-day month 730.5 on average |
| Hours in a year |
8,760 for a 365-day year 8,784 for a 366-day year 8,766 on average |
| Hours in a decade |
87,648 for a 2-leap-year decade 87,672 for a 3-leap-year decade 87,660 on average |
| Hours in a century | 876,600 |
How to Use This Calculator
Calculate time between two points in two ways:
- Simple time: Calculate hours between two times on the same day
- Between dates: Calculate hours between two different dates and times
Common Time Calculations
- Work hours: Track daily work time from clock-in to clock-out, minus unpaid breaks
- Event duration: Calculate length of meetings, events, or activities
- Overtime: Hours over 40/week are paid at 1.5× (time and a half) under federal law. Some states require daily overtime over 8 hours
- Project tracking: Measure time spent on tasks for billing or productivity analysis
Work Hours and Pay
A standard full-time schedule is 40 hours per week, or 2,080 hours per year (52 weeks). With 2 weeks paid vacation, the actual working hours are 2,000.
Overtime Calculation
Federal law (FLSA) requires overtime pay at 1.5× regular rate for non-exempt employees working over 40 hours/week. Example: at $20/hour, overtime is $30/hour. Some states (California, Alaska, Nevada, Colorado) also require daily overtime after 8 hours.
Converting Time to Decimal Hours
Payroll systems use decimal hours, not minutes. To convert: divide minutes by 60.
- 7 hours 30 minutes = 7.50 hours
- 8 hours 15 minutes = 8.25 hours
- 6 hours 45 minutes = 6.75 hours
- 5 hours 20 minutes = 5.33 hours