Hours Calculator
Calculate time duration between two times, add or subtract hours and minutes, convert time to decimal format, and compare durations. Perfect for work hours tracking, project time management, and calculating time differences.
What Is a Hours Calculator?
A hours calculator (or time calculator) is a tool that helps you perform various time-related calculations. It can calculate the duration between two times, add or subtract hours and minutes, convert time to decimal format, and compare different time durations.
This calculator is perfect for:
- Work Hours Tracking: Calculate your total work hours including breaks.
- Project Time Management: Add up time spent on different tasks.
- Payroll Calculations: Convert time to decimal format for payroll processing.
- Scheduling: Compare durations and plan your time effectively.
How Does the Hours Calculator Work?
The calculator supports five modes:
⏱️ Duration: Calculates the time between a start and end time, minus any break time.
➕ Add Time: Adds two durations together (hours + minutes).
➖ Subtract Time: Subtracts one duration from another.
🔢 To Decimal: Converts hours, minutes, and seconds to decimal format.
⚖️ Compare: Compares two durations and shows which is longer.
All calculations are performed in seconds internally, then formatted for display. The formula for decimal hours is: Hours + Minutes/60 + Seconds/3600.
Why Use This Hours Calculator?
- Five Modes: Duration, add, subtract, decimal, and compare.
- Break Time Support: Subtract breaks automatically in duration mode.
- Multiple Formats: View results in H:MM:SS, decimal hours, or decimal minutes.
- Visual Breakdown: A chart shows your time distribution.
- Free & Private: No registration, no data storage.
Common Time Calculations
- Work Hours: Start 9:00 AM, End 5:00 PM, 30 min break = 7.5 hours.
- Adding Time: 2h30 + 1h45 = 4h15 (4.25 hours).
- Subtracting Time: 5h00 − 2h30 = 2h30 (2.5 hours).
- Decimal Conversion: 2h30m = 2.5 hours = 150 minutes.
❓ Hours Calculator FAQ
How do I calculate work hours with a break?
Use the "Duration" mode. Enter your start time, end time, and break duration in minutes. The calculator will subtract the break from the total time. For example: Start 9:00 AM, End 5:00 PM, Break 30 min = 7.5 work hours.
How do I add time durations?
Use the "Add Time" mode. Enter the hours and minutes for two durations. The calculator will add them together and show the result. For example: 2h30 + 1h45 = 4h15.
How do I subtract time durations?
Use the "Subtract Time" mode. Enter the hours and minutes for two durations. The calculator will subtract the second from the first. For example: 5h00 − 2h30 = 2h30.
How do I convert time to decimal format?
Use the "To Decimal" mode. Enter hours, minutes, and seconds. The calculator will show the decimal hours and minutes. For example: 2 hours 30 minutes = 2.5 hours = 150 minutes.
What is the formula for decimal hours?
Decimal Hours = Hours + Minutes/60 + Seconds/3600. For example: 2h 30m = 2 + 30/60 = 2.5 hours.
How do I compare two durations?
Use the "Compare" mode. Enter two durations in hours and minutes. The calculator will show which one is longer and the difference between them.
What is the difference between 12-hour and 24-hour time?
12-hour time uses AM/PM (e.g., 9:00 AM, 5:00 PM). 24-hour time uses a 0-23 hour format (e.g., 09:00, 17:00). This calculator uses 24-hour time for consistency and accuracy.
How many hours are in a work day?
A standard work day is typically 8 hours (9:00 AM to 5:00 PM with a 1-hour lunch). With a 30-minute lunch, it's 7.5 hours. This varies by company and country.
How do I calculate overtime hours?
Calculate your total work hours using the duration mode, then subtract your standard work hours. For example, if you worked 9 hours and your standard is 8, you have 1 hour of overtime.
What is the difference between elapsed time and duration?
Elapsed time is the total time between two points in time. Duration is the length of time something takes. They are essentially the same — this calculator calculates both.
How do I calculate time in decimal for payroll?
Use the "To Decimal" mode. Enter your hours and minutes worked, and the calculator will show decimal hours. For payroll, 7 hours 30 minutes = 7.5 hours. Multiply by your hourly rate to get gross pay.
Can I use this calculator for project time tracking?
Yes. Use the "Add Time" mode to sum up time spent on different tasks. You can also use the "Duration" mode to track time for individual tasks.
What is the difference between minutes and decimal minutes?
Minutes are in base 60 (60 minutes = 1 hour). Decimal minutes are in base 100 (100 decimal minutes = 1 hour). For example: 30 minutes = 0.5 decimal hours = 50 decimal minutes.
How do I calculate time for billing clients?
Track your time using the "Duration" mode. Convert to decimal hours using the "To Decimal" mode. Multiply decimal hours by your hourly rate to get the billable amount.
What is the maximum time this calculator can handle?
The calculator can handle up to 99 hours, 59 minutes, and 59 seconds for most modes. This is sufficient for work hours, project time, and most time calculations.
How does the calculator handle midnight crossings?
If your end time is earlier than your start time, the calculator assumes the end time is on the next day (e.g., 11:00 PM to 2:00 AM = 3 hours). This is common for night shifts.
What is the 24-hour time format?
The 24-hour format uses hours from 00:00 (midnight) to 23:59. It eliminates AM/PM confusion. For example: 9:00 AM is 09:00, 5:00 PM is 17:00, midnight is 00:00.
Is this calculator accurate for payroll calculations?
This calculator provides accurate time-to-decimal conversions. However, always verify with your employer's payroll policies, as some companies use different rounding rules.
How do I calculate time for a timesheet?
Use the "Duration" mode for each day. Enter your start and end times, subtract breaks, and record the total. Many timesheets require decimal hours, which you can get from the "To Decimal" mode.
Can I use this calculator on my phone?
Yes. This calculator is fully responsive and works on smartphones, tablets, and desktop computers. The inputs are touch-friendly for easy mobile use.