How do I calculate hours between two times?

Enter your start time and end time — including AM or PM for each — into CalculatorFlix's free hours calculator and click Calculate. The tool instantly shows your total duration in hours and minutes, decimal hours for payroll use, and total minutes. For example, 9:00 AM to 5:30 PM = 8 hours 30 minutes = 8.50 decimal hours = 510 minutes. No manual math, no AM/PM confusion, no conversion needed.

What is decimal hours and why does payroll use it?

Decimal hours converts time into a single number that payroll systems can multiply directly by your hourly rate. Instead of 8 hours 30 minutes, payroll uses 8.50. To find your pay, multiply 8.50 by your hourly rate — for example, 8.50 times $18 equals $153. Standard minutes do not multiply cleanly by a wage rate, which is why US payroll systems converted to decimal hours as the standard format. CalculatorFlix calculates your decimal hours automatically alongside your regular hours and minutes.

Does the hours calculator work for overnight shifts that cross midnight?

Yes. CalculatorFlix's hours calculator automatically handles overnight shifts that cross midnight without any extra steps from you. Enter 10:45 PM as your start time and 7:15 AM as your end time and the calculator correctly returns 8 hours 30 minutes. You do not need to split the shift or do any manual adjustment. The tool recognizes that the end time is on the next day and calculates the full span accordingly.

How can I use the hours calculator to check my paycheck?

Enter your actual clock-in and clock-out times for each shift into CalculatorFlix's hours calculator and note the decimal hours total for each shift. Add all your shifts together and multiply the total decimal hours by your hourly rate to get your expected gross pay. Compare this against your paycheck or employer timesheet. The US Department of Labor requires employers to pay for all hours worked — if your numbers and your employer's numbers do not match, you have a concrete basis to bring to your HR department.

What is the difference between 12 AM and 12 PM?

12 AM is midnight — the start of a new calendar day. 12 PM is noon — the middle of the day. These two are the most commonly confused times in the 12-hour clock system. Mixing them up throws off every calculation that follows. If your shift starts at midnight, enter 12:00 AM. If your lunch break ends at noon, enter 12:00 PM. CalculatorFlix's hours calculator treats each correctly so your total is always accurate.

Free Hours Calculator – Know Your Exact Shift Hours, Decimal Time & Total Minutes Before Payday

You clocked in at 8:47 AM and clocked out at 5:13 PM. Your timesheet says 8 hours. Your calculator says 8 hours and 26 minutes. That difference is money — and it is yours. CalculatorFlix's free hours calculator gives you the exact hours and minutes between any two times, plus decimal hours for payroll, and handles overnight shifts without a second thought. Enter your times. Get your answer. Know what you are owed. Free, private, no sign-up required.

Start Time

End Time

Hours Between Two Dates

Calculate the total number of hours and minutes between two dates and times.

Start Date and Time

End Date and Time

Enter your times and click Calculate to view the duration.

Total Duration 0 hours 0 minutes

Time Format 00:00

Decimal Hours 0.00

Total Minutes 0 minutes

Disclaimer

This hours calculator is for general reference and personal use only. Results are based on standard time conventions and do not account for time zone differences, daylight saving changes, or company-specific rounding policies. For payroll or wage disputes, always verify hours with your employer or HR department.

Expert Review

This content was reviewed by a workplace scheduling specialist and content team with years of experience in shift planning, payroll tracking, and time management systems. Time conventions referenced here reflect standard usage across US workplaces, scheduling software, and hourly wage calculations. Last updated June 25, 2026.

Sources

National Institute of Standards and Technology — Official US time standards
US Department of Labor — Wage and hour calculation guidelines
Federal Aviation Administration — 24-hour time format usage in aviation
Bureau of Labor Statistics — Work hour and shift tracking standards
US Naval Observatory — Time measurement and clock conventions

About Hours Calculator

The Hours Calculator works out the time between two clock times. Say your shift started at 9 in the morning and ended at 5:30 in the evening. How long was that? Enter the start time and the end time, and it tells you the hours and minutes in between. People use it to check work shifts, figure out overtime, or plan travel when they need to know how long something runs.

Benefits

Skips the manual math when figuring out hours between two times.
Useful for hourly workers checking shift length before payday.
Helps with travel planning when calculating layovers or flight duration.
Works across AM and PM without any confusion or guesswork.
Free, no sign-up, and ready to use on any device.

How It Works

Type in your start time and end time, picking AM or PM for each. The calculator counts up everything in between and gives you the answer in hours and minutes. If your shift runs past midnight into the next day, it still works out fine without any extra steps from you.

Did You Know?

Airlines, hospitals, and the military all stick to the 24-hour clock for one reason: AM and PM mix-ups cause real problems. A nurse reading "8:00" on a chart needs to know if that's morning or night, and military time removes that guesswork completely.

Myths vs Facts

Myth: 12 AM and 12 PM are interchangeable — Fact: 12 AM is midnight, 12 PM is noon. Mixing these up throws off every calculation that follows.
Myth: This tool only works for whole hours — Fact: It calculates down to the minute, not just rounded hours.
Myth: Overnight shifts break the calculation — Fact: The calculator adjusts automatically when your end time crosses into the next day.
Myth: You need to convert to 24-hour time yourself — Fact: Enter AM or PM directly, the tool handles the conversion.

How Hourly Workers Catch Payroll Mistakes

Clock in at 8:47 AM, clock out at 5:13 PM. Most timesheets round that to the nearest quarter hour, and not always in your favor. Running your real hours through this calculator before payday tells you exactly what you should be paid. If the numbers don't match your paycheck, you have something concrete to bring to HR.

Why Pilots, Nurses, and Truckers Live by the Clock

A nurse on a 12-hour shift, a pilot logging duty time, a trucker tracking Hours of Service limits. These jobs run on precise time math because federal rules cap how long someone can work before mandatory rest. A few unrecorded minutes can create tracking or compliance issues. This tool gives these workers a quick way to double-check their numbers. For shift schedules spanning different calendar dates, our Date Converter can help too.

How Students Track Study and Volunteer Hours

Some students and workers need to track hours carefully for scholarship, program, or visa-related requirements. Logging start and end times throughout the week and running them through this calculator keeps a clean record. When it's time to fill out a form, the numbers are already there. You can also check our Age Calculator if eligibility depends on your age.

Privacy Note

What you type stays right there on your screen. Nothing is shared with a server, nothing gets saved. Close the tab, and all data is erased, as if it never happened.

When Should You Use This Tool?

Checking your timesheet before payday to make sure the hours add up correctly.
Planning a trip and working out how long a flight, layover, or drive will take. Pair it with our Date Calculator for trip planning.
Tracking study or volunteer hours for scholarship applications or visa requirements.
Figuring out how long a work shift runs, especially when it crosses midnight.
Settling any quick dispute about how much time has passed between two clock times.

Enter your start time and end time, and get your answer in seconds. Whether you're checking a paycheck, planning travel, or logging study hours, the numbers are right there. No sign-up, no subscription cost, works on any device.

Editorial Disclosure: This content was drafted with AI assistance and reviewed by our team for accuracy, clarity, and relevance. Calculation methodologies are validated against authoritative sources. Last reviewed: [June 25, 2026].