Hours Calculator

To calculate hours between two times, follow these steps:

1. Enter your start time: Input the starting hour in 24-hour format (0 through 23) and the starting minute (0 through 59). For example, 9:00 AM is hour 9, minute 0. For 2:30 PM, enter hour 14, minute 30.
2. Enter your end time: Input the ending hour and minute using the same 24-hour format. If the end time is earlier than the start time, the calculator automatically assumes the shift crosses midnight into the next day.
3. Review your results: The calculator displays three output formats: total hours (the whole-number hours component), total minutes (the entire duration expressed in minutes), and decimal hours (a decimal representation ideal for payroll and billing).

If you need to account for break deductions, calculate your total shift duration first, then subtract your break time. For example, if your shift is 9 hours and you took a 30-minute unpaid lunch, your billable time is 8.5 decimal hours. For multiple breaks, add all break durations together and subtract the total from your shift hours.

For overnight shifts, simply enter the times as they occur on the clock. A shift from 11:00 PM (hour 23) to 7:00 AM (hour 7) will correctly calculate as 8 hours. The calculator handles the midnight crossing automatically without requiring separate date entries.

An hours calculator determines the total duration between two times, displaying results in multiple formats including hours and minutes, total minutes, and decimal hours. Tracking hours accurately is fundamental to modern work life, affecting everything from payroll processing to project management and client billing. For employers, precise time tracking ensures compliance with labor laws and prevents costly payroll errors that can lead to disputes or legal action.

Under the Fair Labor Standards Act (FLSA), non-exempt employees in the United States must be paid at least minimum wage for all hours worked, plus overtime pay at one-and-a-half times their regular rate for any hours exceeding 40 in a workweek. This is commonly known as time-and-a-half. Accurate hour calculations are therefore critical for determining whether overtime thresholds have been reached and what the correct pay amount should be.

Beyond payroll, hours calculations are essential for project management where teams need to track time spent on tasks, for freelancers and consultants who bill clients by the hour, and for scheduling purposes where shift lengths must be planned carefully. The decimal hours format is particularly valuable because it simplifies multiplication with hourly rates, making invoicing and payroll calculations straightforward. For example, 8 hours and 45 minutes converts to 8.75 decimal hours, which can be directly multiplied by an hourly rate to determine pay.

This calculator handles a variety of scenarios including standard day shifts, overnight shifts that cross midnight, and split shifts. It automatically detects when an end time is earlier than a start time and adds 24 hours to produce the correct duration, eliminating the need for manual date-based calculations.

The hours calculation relies on converting times to minutes since midnight, then computing the difference:

• Convert to Minutes: Total Minutes from Midnight = (Hour × 60) + Minute
• Duration in Minutes: End Total Minutes − Start Total Minutes. If the result is negative (end time is before start time), add 1,440 (the number of minutes in 24 hours) to account for the overnight crossing.
• Hours and Minutes: Whole Hours = Floor(Duration ÷ 60). Remaining Minutes = Duration mod 60.
• Decimal Hours: Duration in Minutes ÷ 60. This gives a decimal value suitable for payroll multiplication.

For overtime calculations, once you know total weekly hours, any amount over 40 hours is paid at 1.5 times the regular hourly rate: Overtime Pay = (Hours over 40) × Hourly Rate × 1.5. Regular Pay = 40 × Hourly Rate. Total Pay = Regular Pay + Overtime Pay.

For pay calculations, multiply decimal hours by the hourly wage: Gross Pay = Decimal Hours × Hourly Rate.

Example 1 — Standard Work Week: An employee works Monday through Friday, clocking in at 8:00 AM (hour 8, minute 0) and clocking out at 4:30 PM (hour 16, minute 30) each day. The daily calculation is: End minutes = (16 × 60) + 30 = 990. Start minutes = (8 × 60) + 0 = 480. Duration = 990 − 480 = 510 minutes = 8 hours 30 minutes = 8.5 decimal hours. Over five days, the employee works 8.5 × 5 = 42.5 hours. At $22 per hour with overtime after 40 hours: Regular pay = 40 × $22 = $880. Overtime pay = 2.5 × $22 × 1.5 = $82.50. Total weekly pay = $962.50.

Example 2 — Overnight Shift with Overtime: A warehouse worker starts at 10:00 PM (hour 22, minute 0) and ends at 6:30 AM (hour 6, minute 30). Start minutes = 1,320. End minutes = 390. Since end is less than start, add 1,440: adjusted end = 1,830. Duration = 1,830 − 1,320 = 510 minutes = 8 hours 30 minutes = 8.5 decimal hours. If this worker does four such shifts per week, the total is 34 hours, which is under the 40-hour overtime threshold.

Example 3 — Freelance Billing: A graphic designer tracks time on a client project across three sessions: Session 1 from 9:00 AM to 12:15 PM = 3.25 hours. Session 2 from 1:00 PM to 3:45 PM = 2.75 hours. Session 3 from 7:00 PM to 9:30 PM = 2.5 hours. Total billable time = 3.25 + 2.75 + 2.5 = 8.5 decimal hours. At a rate of $75 per hour, the invoice amount is 8.5 × $75 = $637.50. The decimal format makes calculating each session and the total invoice straightforward.