time-date ToolUpdated 2026-09-19
Time Duration Calculator
Calculate the total hours and minutes between a start time and end time for timecards, payroll, and study logs.
Formula & Mathematical Methodology
Duration = End Time − Start Time
Converts both clock times to total minutes, subtracts start from end, and resolves midnight crossing.
How to Use This Time Duration Calculator
- Enter start and end times in HH:MM format.
Step-by-Step Worked Example
Scenario: 08:30 to 17:15
1. Start: 8 hr 30 min = 510 min
2. End: 17 hr 15 min = 1,035 min
3. Difference: 525 min = 8 hrs 45 min (8.75 decimal hours)
Final Calculated Result: 8 Hours, 45 Minutes (8.75 Hours)
What Does Your Result Mean?
Provides both hours/minutes and decimal hours for easy multiplication with hourly pay rates.
Common Practical Applications:
- Freelance work logs
- Employee timesheet submission
- Flight flight-time calculation
Important Limitations & Assumptions:
- If end time is earlier than start time, the calculation assumes an overnight shift crossing midnight.
Frequently Asked Questions
How do you convert 45 minutes to decimal hours?
Divide minutes by 60: 45 ÷ 60 = 0.75 hours.
Related Calculators
Salary Calculator
Convert annual salaries into hourly, weekly, and monthly pay.
Age Calculator
Calculate your exact age down to days, hours, and minutes.
Date Difference Calculator
Calculate exact days, weeks, and months between two dates.
Days Between Dates Calculator
Count total calendar days separating two dates.
More in Time & Date
Explore all 21 time & date calculators and educational tools.
Browse Time & Date Calculators