Hours Calculator
Calculate the hours and minutes between two times or across multiple days
How to Use This Hours Calculator
- Choose 'Same Day' for hours within one day, or 'Multiple Days' for spans across dates
- Enter start time (hour, minute, AM/PM) and end time
- For multiple days, also enter the start and end dates
- Click 'Calculate Hours' to see the duration in multiple formats
Example: Working from 9:00 AM to 5:30 PM is 8 hours 30 minutes, or 8.5 decimal hours (what you'd report on a timesheet). Over 3 days from Monday 8 AM to Wednesday 6 PM is 58 hours total, or 2.42 days.
Tip: Use 'decimal hours' for timesheets and billing. 7 hours 45 minutes = 7.75 hours. Multiply by hourly rate for easy calculation.
Why Use a Hours Calculator?
Tracking hours accurately is essential for payroll, billing, project management, and scheduling. Converting between time formats (hours:minutes vs decimal) is a common need.
- Calculate work hours for timesheet entry
- Determine billable hours for client invoicing
- Track study time or practice hours
- Calculate flight or travel duration
- Measure event or meeting length
- Convert time to decimal for calculations
Understanding Your Results
Results show time in hours:minutes format and decimal hours. Decimal format is often needed for payroll systems and billing.
| Result | Meaning | Action |
|---|---|---|
| Under 1 hour | Short duration | Often expressed in minutes only |
| 1-8 hours | Typical work shift or activity | Standard timesheet increments |
| 8-12 hours | Extended shift | May trigger overtime depending on rules |
| Over 24 hours | Multi-day span | Consider expressing in days and hours |
Meaning: Short duration
Action: Often expressed in minutes only
Meaning: Typical work shift or activity
Action: Standard timesheet increments
Meaning: Extended shift
Action: May trigger overtime depending on rules
Meaning: Multi-day span
Action: Consider expressing in days and hours
Note: If end time is earlier than start time on the same day, the calculator assumes the time crosses midnight.
About Hours Calculator
Formula
Duration = End Time - Start Time (in minutes), converted to hours Times are converted to minutes: (hour x 60) + minutes. The difference gives duration in minutes. Divide by 60 for decimal hours, or compute hours and remaining minutes for HH:MM format.
Current Standards: US Department of Labor allows rounding to nearest 5, 6, or 15 minutes for payroll if consistently applied. Many systems use quarter-hour increments (0.25, 0.5, 0.75). Military time (24-hour format) eliminates AM/PM confusion.
Frequently Asked Questions
How do I convert minutes to decimal hours?
Divide minutes by 60. Common conversions: 15 min = 0.25 hr, 30 min = 0.5 hr, 45 min = 0.75 hr. For 7 hours 23 minutes: 23 / 60 = 0.383, so 7.38 hours. For payroll, you might round to 7.25 or 7.5 depending on company policy.
Why does my timesheet software show different hours?
Timesheet systems may round to specific increments (usually 15 minutes), apply break deductions automatically, or use different rounding rules (round down/up/nearest). Also check that times entered match AM/PM settings. 1:00 to 9:00 is 8 hours with correct AM/PM but could miscalculate if one is wrong.
How do I handle overnight shifts?
Use the 'Multiple Days' tab and enter different dates for start and end. Or on 'Same Day,' if end time is earlier than start (like 11 PM to 7 AM), the calculator automatically adds 24 hours. A shift from 10 PM Monday to 6 AM Tuesday is 8 hours.
Should I count lunch breaks in my hours?
Generally no - unpaid breaks should be subtracted from total hours. If you work 9 AM to 5 PM with a 30-minute lunch, billable hours are 7.5, not 8. Some employers auto-deduct breaks; others require manual tracking. Check your company policy.
What time format do international teams use?
24-hour time (military time) is standard internationally and avoids AM/PM confusion. 9:00 AM is 09:00, 5:30 PM is 17:30, midnight is 00:00 or 24:00. Using 24-hour format in international communication prevents scheduling errors.