Calculate Hours Between Times
Enter a start and end time to get total hours in multiple formats.
How the Hours Calculator Works
Simple steps to calculate hours.
Enter Start Time
Set the starting time using the time picker. Any time from 00:00 to 23:59.
Enter End Time
Set the ending time. Overnight durations (end before start) are handled automatically.
Calculate
Click "Calculate Hours" and get instant results in HH:MM and decimal formats.
Use Results
Copy decimal hours for payroll or use HH:MM for scheduling. All formats available.
What Is an Hours Calculator?
Understanding time-to-hours conversion.
Hours calculation basics
An Hours Calculator converts the time span between two clock readings into a numeric value. The formula: Hours = (End Time − Start Time) ÷ 60 minutes.
The key output is decimal hours — the format used in payroll systems, billing software, and project management tools. 8 hours 30 minutes = 8.50 decimal hours.
Common decimal conversions
- 15 minutes = 0.25 hours
- 30 minutes = 0.50 hours
- 45 minutes = 0.75 hours
- 20 minutes = 0.33 hours
- 10 minutes = 0.17 hours
Overnight handling
If the end time is before the start time (e.g., 10 PM to 6 AM), the calculator adds 24 hours to produce the correct 8-hour result.
When to Use an Hours Calculator
Common hours calculation scenarios.
Payroll Processing
Convert clock-in/out times to decimal hours for payroll. Multiply by hourly rate for accurate compensation.
Client Billing
Track billable hours per client. Convert to decimal format for invoicing and accounting software.
Timesheet Entry
Fill in digital timesheets that require decimal hours. Avoid manual conversion errors.
Sports Timing
Convert race and workout durations to hours for pace calculations and training logs.
Study Tracking
Log study session hours in decimal format. Track total weekly study time easily.
Media Production
Calculate recording session length for audio and video projects. Budget studio time precisely.
Hours Calculation Examples
Common time-to-hours conversions.
Standard workday
9:00 AM → 5:30 PM = 8h 30m = 8.50 decimal hours = 510 minutes.
Half day
9:00 AM → 1:00 PM = 4h 00m = 4.00 decimal hours = 240 minutes.
Night shift
10:00 PM → 6:00 AM = 8h 00m = 8.00 decimal hours = 480 minutes.
Frequently Asked Questions
Common questions about the Hours Calculator.
Enter a start time and end time. The calculator subtracts the start from the end and shows the result in hours and minutes (HH:MM), decimal hours, total minutes, and total seconds.
Decimal hours express time as a decimal number. 7 hours 30 minutes = 7.50 decimal hours. 45 minutes = 0.75 hours. This format is standard for payroll, billing, and timesheets because it multiplies directly with hourly rates.
Yes. If the end time is earlier than the start time (e.g., 10 PM to 6 AM), the calculator adds 24 hours to correctly compute the overnight duration as 8 hours.
Absolutely. The decimal hours output is ready for payroll calculations. Multiply decimal hours by the hourly rate to get pay. 7.50 hours × $20/hr = $150.
Divide minutes by 60. For example: 15 min = 0.25 hrs, 30 min = 0.50 hrs, 45 min = 0.75 hrs, 20 min = 0.33 hrs. The calculator does this automatically.
Yes, completely free. No sign-up required. All calculations happen in your browser — your data stays private.