An hour is a standard unit of time equal to 60 minutes. A minute equals 60 seconds and one second is measured as the time it takes for 9,192,631,770 cycles of the cesium-133 atom radiation transition. A full day has 24 hours and time is read using either the 12-hour clock or the 24-hour clock.

12-Hour Clock

The 12-hour clock runs from 1 to 12, repeated twice a day. It uses AM (ante meridiem) for morning and PM (post meridiem) for afternoon/evening. For example, 12 AM is midnight and 12 PM is noon.

24-Hour Clock

The 24-hour clock runs from 0:00 to 23:59. It avoids confusion and is widely used in military, aviation and international timekeeping. For example, 18:00 = 6:00 PM.

1. Select your preferred time format (12-hour or 24-hour).
2. Enter the Start Time.
3. Enter the End Time.
4. Click the Calculate button.
5. Get instant, accurate results with total hours, minutes and seconds.

Want to know how many hours are between 5:30 PM and 8:50 AM? Or how many hours remain until your birthday? Our online hours calculator makes it simple — just enter two times and the tool will calculate the exact difference instantly.

Employees often ask: “How many hours did I work?” Instead of manually converting hours and minutes into decimals, our work hours calculator does it for you.

Example (Manual):

7:30 = 7.5 hours
1:45 = 1.75 hours
Total = 9.25 hours
          

This manual method is slow and prone to mistakes. Our calculator provides instant, error-free results in hours, minutes and seconds.

• Hours in a Day: 24 hours
• Hours in a Week: 7 × 24 = 168 hours
• Hours in a Month: Avg. 730.5 hours (744 in 31-day months, 672 in February)
• Hours in a Year: 365 × 24 = 8,760 hours (8,784 in leap years)

Hourly employees are paid per hour worked (e.g., $20/hour). Salaried employees earn a fixed paycheck, regardless of extra hours. Hourly workers can calculate overtime pay using the hours calculator, while salaried employees calculate their effective hourly rate by dividing salary by yearly hours worked.

Example: $80,000/year ÷ 2000 hours ≈ $40/hour.

Jobs Around $25/Hour

• Technicians ≈ $23.7
• Social Workers ≈ $24.0
• Planners ≈ $26.0
• Construction Operators ≈ $25.5

Jobs Over $100/Hour

• Life Coach
• Freelance Photographer
• Commercial Pilot
• Anesthesiologist
• Orthodontist

• How many work hours in a day? Typically 8 hours per workday (40 hours per week).
• How many hours from 7:30 to 3:30? Exactly 8 hours.
• How many seconds in an hour? 1 hour = 60 minutes = 3,600 seconds.
• Can I calculate weekly or monthly hours? Yes, just enter the start and end times for each day and add them up using the calculator.
• Is the hours calculator free? Yes, it’s 100% free, online and unlimited.