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Calculate exact time duration between two points in hours, minutes & seconds. Free online time duration calculator for work hours, study time, events, payroll, and project management. Accurate, fast, and easy to use.
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Select Calculation Type: Choose from 7 calculation types: Duration, Addition, Subtraction, Business Hours, Timezone Conversion, Work Days, or Overtime Calculator
Enter Time Values: Input the required time values based on your selected calculation type
Calculate Results: Click calculate to get detailed results with formulas and explanations
Business & Finance: Calculate total hours worked, track project timelines, ensure SLA tracking, get detailed billing breakdowns.
Education & Productivity: Track study sessions, plan exam preparation, measure productivity, track habits.
Additional Applications: Track conference lengths, manage deadlines, handle international scheduling.
Time duration is the amount of time that passes between two specific points or events. It is a fundamental measurement used in everything from payroll (calculating hours worked) to scientific research (measuring reaction times) and travel (calculating flight durations).
"In professional scheduling, it's crucial to distinguish between 'Elapsed Time' (the total real-world time passed) and 'Billable Time' or 'Business Hours'. When calculating duration for payroll, always ensure you're accounting for cross-midnight shifts correctly, as most basic calculators fail to handle the 24-hour rollover without manual adjustment. Our tool automates this transition seamlessly."
| Unit of Time | Equivalent Value | Scientific Notation |
|---|---|---|
| 1 Minute | 60 Seconds | 6.0 x 10¹ s |
| 1 Hour | 60 Minutes / 3,600 Seconds | 3.6 x 10³ s |
| 1 Day | 24 Hours / 1,440 Minutes | 8.64 x 10⁴ s |
| 1 Week | 168 Hours / 10,080 Minutes | 6.048 x 10⁵ s |
| 1 Month (Avg) | 730.48 Hours | 2.629 x 10⁶ s |
| 1 Year | 8,765.8 Hours | 3.155 x 10⁷ s |
This tool helps you find the exact time span between any two points, whether you're tracking work hours, planning events, or managing project timelines. It provides precise results in hours, minutes, and seconds with support for various calculation types.
The fundamental formula is simple: Duration = End Time - Start Time. This principle works for all duration calculations, and the tool automatically handles edge cases like overnight shifts and cross-midnight scenarios.
Results are displayed in multiple formats, showing both total hours and detailed breakdowns. This makes it perfect for professional use where precision matters.
For professionals tracking work schedules, the business hours feature allows you to calculate total hours worked while excluding non-business hours. This is perfect for payroll processing, where you need to track only billable hours.
The tool goes beyond basic calculations, helping freelancers, consultants, and service providers achieve accurate billing with precision that meets professional standards.
Beyond basic duration, the tool offers advanced features. You can add specific durations to a start time or subtract time periods, making it invaluable for scheduling and planning.
For global teams, the timezone conversion feature automatically handles time differences, making it easy to coordinate international meetings and schedules across different regions.
The overtime feature separates regular hours from overtime hours based on your threshold, essential for payroll compliance. Meanwhile, the work days feature calculates business days between dates, excluding weekends and holidays.
Start: 9:00 AM | End: 5:30 PM
Result: 8h 30m
Start: 2:30 PM | Add: 3h 45m
Result: 6:15 PM
7 AM - 6 PM (Biz: 9-5)
Result: 8 hours
| Feature | Basic Duration | Business Hours | Timezone Conversion |
|---|---|---|---|
| Time Range | Any time | Business hours only | Any timezone |
| Break Exclusion | Manual | Automatic | Manual |
| Best For | General use | Payroll & billing | Global teams |
| Precision | Hours & minutes | Hours & minutes | Hours & minutes |