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Hours Calculator

Calculate work hours, overtime, and pay from your time card. Track regular and overtime hours with automatic pay calculation.

Modify the values and click the Calculate button to use

Time Difference Worksheet
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Hours Between Dates Worksheet
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Hours in Different Time Periods

Description Hours
Hours in a day 24
Hours in a week 168
Hours in a month 672 for a 28-day month
696 for a 29-day month
720 for a 30-day month
744 for a 31-day month
730.5 on average
Hours in a year 8,760 for a 365-day year
8,784 for a 366-day year
8,766 on average
Hours in a decade 87,648 for a 2-leap-year decade
87,672 for a 3-leap-year decade
87,660 on average
Hours in a century 876,600

How to Use This Calculator

Calculate time between two points in two ways:

  • Simple time: Calculate hours between two times on the same day
  • Between dates: Calculate hours between two different dates and times

Common Time Calculations

  • Work hours: Track daily work time from clock-in to clock-out, minus unpaid breaks
  • Event duration: Calculate length of meetings, events, or activities
  • Overtime: Hours over 40/week are paid at 1.5× (time and a half) under federal law. Some states require daily overtime over 8 hours
  • Project tracking: Measure time spent on tasks for billing or productivity analysis

Work Hours and Pay

A standard full-time schedule is 40 hours per week, or 2,080 hours per year (52 weeks). With 2 weeks paid vacation, the actual working hours are 2,000.

Overtime Calculation

Federal law (FLSA) requires overtime pay at 1.5× regular rate for non-exempt employees working over 40 hours/week. Example: at $20/hour, overtime is $30/hour. Some states (California, Alaska, Nevada, Colorado) also require daily overtime after 8 hours.

Converting Time to Decimal Hours

Payroll systems use decimal hours, not minutes. To convert: divide minutes by 60.

  • 7 hours 30 minutes = 7.50 hours
  • 8 hours 15 minutes = 8.25 hours
  • 6 hours 45 minutes = 6.75 hours
  • 5 hours 20 minutes = 5.33 hours

Related Calculators

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Frequently Asked Questions

How is overtime calculated?

Overtime is usually paid at 1.5 times the regular rate for hours over 40 in a week. Working 45 hours at $20 an hour pays 40 x $20 = $800 plus 5 x $30 = $150, for $950. Some states also require overtime for hours over 8 in a day, and double time often applies to holidays or hours over 12.

How do I calculate hours worked for an overnight shift?

Treat the end time as falling on the next day. A shift from 10 PM to 6 AM is 2 hours before midnight plus 6 hours after, for 8 hours. Subtracting the clock times directly gives a negative number, so add 24 hours whenever the end time is earlier than the start time.

How do I convert 38.75 hours to hours and minutes?

38.75 hours is 38 hours and 45 minutes. Multiply the decimal part by 60 to get minutes: 0.75 x 60 = 45. The same rule gives 0.25 hours = 15 minutes and 0.5 hours = 30 minutes. To go the other way, divide minutes by 60, so 7 hours 20 minutes is about 7.33 hours.

Should breaks be included in hours worked?

Unpaid meal breaks, such as a lunch hour, are left out of hours worked, while short paid breaks of around 15 minutes are counted. An 8 AM to 5 PM day with an unpaid hour for lunch is 8 hours worked, not 9. A 7 AM to 3:30 PM shift with a 30 minute unpaid break is also 8 hours.