Hours Calculator
Hours Calculator
Find out exactly how many hours and minutes are between any two times — whether you're working out a full shift, logging a timesheet, or just curious how long something took. Enter your start and end time, add any break, and your answer appears instantly.
Hours Calculator — Find the Exact Time Between Any Two Times
Need to know exactly how many hours and minutes passed between two times? This hours calculator gives you an instant answer — just enter your start time, end time, and any break time, and you'll see the total working hours right away.
Whether you're filling out a timesheet, calculating payroll, tracking a project, or figuring out a work shift, this tool handles both 12-hour (AM/PM) and 24-hour formats with no extra steps required.
How to Calculate Hours Worked
Calculating your work hours is simple in four steps. The calculator handles the arithmetic — you just need to know your start time, end time, and whether you took a break.
Step 1
Enter your start time. Choose the hour and minute your shift or work session began. Select AM or PM if you are on 12-hour format, or switch to 24-hour mode to avoid any ambiguity.
Step 2
Enter your end time. The time you finished. If your shift crosses midnight — for example, starting at 10:00 PM and finishing at 6:00 AM — the calculator detects this automatically and gives the correct 8-hour total.
Step 3
Add break time (optional). Enter any unpaid break in minutes, such as a 30-minute lunch or a 15-minute rest. This amount is deducted from your gross time to give you net hours worked.
Step 4
Click Calculate. Your total hours and minutes appear instantly. No rounding, no formulas, no manual math.
Example: Start time 9:00 AM · End time 5:30 PM · Break time 30 minutes
- Total time elapsed: 8 hours 30 minutes
- Net hours worked: 8 hours 00 minutes
How to Calculate Overtime Hours
Overtime kicks in when you work beyond a set daily or weekly threshold. In most countries — including the United States — overtime applies after 8 hours in a single day or after 40 hours in a workweek. Canada and many European countries use similar thresholds, though exact rules vary by region and employment contract.
To calculate your overtime hours, use this calculator to find your total time worked, then compare that number against your standard hours. If you worked 10 hours and your regular day is 8 hours, you have 2 overtime hours.
Once you know your overtime hours, applying your overtime rate is straightforward. The most common overtime rate is time and a half — meaning you multiply your regular hourly wage by 1.5. For example, if your normal rate is $18 per hour, your overtime rate is $27. So 2 overtime hours earns you $54 on top of your regular pay for the day.
| Scenario | Result |
|---|---|
| Worked 10 hrs · Standard day = 8 hrs | 2 hours overtime |
| Worked 48 hrs this week · Standard = 40 hrs | 8 hours overtime |
| Overtime rate at $18/hr (time and a half) | $27.00 per overtime hour |
| 2 overtime hours × $27 | $54.00 overtime earnings |
| Double time (some industries) | Regular wage × 2.0 |
This calculator shows you the raw hours. To check whether your shift qualifies for overtime, simply compare the result against your contracted daily or weekly standard.
Biweekly Hours and Pay Period Calculations
A biweekly pay period covers two consecutive workweeks — 14 calendar days. For a full-time employee working a standard 40-hour week, a biweekly pay period totals 80 hours of regular work. This is the most common pay schedule in the United States.
Use the 'Hours Between Two Dates' section of this calculator to find the total hours between the first day and last day of any pay period. Enter your regular start and end times alongside the date range, and the result gives you the gross hours for that entire period — ideal for payroll review before a pay run.
| Pay period type | Standard hours |
|---|---|
| Weekly (1 week) | 40 hours |
| Biweekly (2 weeks) | 80 hours |
| Semi-monthly (twice per month) | ~86.67 hours |
| Monthly (1 month) | ~173.33 hours |
| Quarterly (3 months) | ~520 hours |
| Annual (full year) | 2,080 hours |
For part-time employees, simply multiply your daily hours by the number of days in the period. A part-time worker doing 5 hours per day, 5 days a week, accumulates 50 hours per biweekly period. For date-based calculations across any period, the Date Duration Calculator can also help you count the total calendar days in the range.
Who Uses an Hours Calculator?
This tool is built for anyone who needs to track, verify, or report time. Here are the most common use cases:
Employees and hourly workers
Log your daily hours before submitting a timesheet. Many payroll discrepancies happen because of rounding or estimation — using an exact hours calculator means the number you submit reflects precisely what you worked, including days where you took a shorter or longer break than usual. If your employer uses a biweekly pay period, use this calculator at the end of each week and total the two results.
Freelancers and consultants
Bill clients accurately by recording start and end times for every work session. A precise hours count protects you in billing disputes, reduces the chance of undercharging, and makes your invoices look professional. Many freelancers also use the Time to Decimal Calculator alongside this tool to convert hours and minutes into the decimal format most invoicing software requires.
Managers and payroll teams
Verify shift hours before running payroll, flag any shifts that qualify for overtime, and spot clock-in/clock-out discrepancies quickly. For multi-employee payroll, calculate each person's hours individually and cross-reference against their contracted hours. The clearer your records, the fewer payroll corrections you will need.
Shift workers, nurses, and healthcare staff
Calculate hours for rotating shifts, back-to-back shifts, night shifts, or on-call periods. The calculator handles times that cross midnight — a night shift starting at 11:00 PM and ending at 7:00 AM correctly shows as 8 hours. Healthcare workers who track hours across a 12-hour shift pattern can use this to confirm their weekly totals against overtime thresholds.
Remote workers and contractors
Remote work makes it easy to blur start and end times. Logging your hours precisely — including lunch breaks — gives you an accurate picture of your actual working time and helps you maintain a healthy boundary between work and personal time. It also provides documentation if your employer or client asks you to verify hours worked in a particular week.
Construction, retail, and warehouse workers
Hourly workers in physical industries often use time cards or punch clocks. If your payslip looks wrong, use this calculator to check the hours yourself by entering your exact clock-in and clock-out times. If the number differs from what your employer calculated, you have a concrete figure to bring to your manager or HR department.
Students and researchers
Measure time spent on study sessions, lab experiments, or research tasks. Useful for any situation — academic or personal — where you need to track elapsed time with precision rather than estimating.
12-Hour vs 24-Hour Time Format — Which Should You Use?
There are two common ways to express time, and both work in this calculator. Understanding the difference helps you enter times correctly and avoid errors.
The 12-hour clock (AM/PM)
Divides the day into two 12-hour cycles — AM runs from midnight to noon, and PM runs from noon to midnight. This is the standard format in the United States, Canada, and most English-speaking countries. Times are written as 9:00 AM or 2:45 PM. The main risk is confusion around 12:00 AM (midnight) and 12:00 PM (noon) — these are counterintuitive to many people.
The 24-hour clock
Counts straight from 0:00 (midnight) to 23:59 (one minute before the next midnight). There is no AM or PM — 14:00 means 2:00 PM, and 23:30 means 11:30 PM. This format is standard across most of Europe, in healthcare settings, aviation, military operations, and most scientific contexts. It eliminates the AM/PM ambiguity entirely.
| 12-hour time | 24-hour equivalent |
|---|---|
| 12:00 AM (midnight) | 0:00 |
| 6:00 AM | 6:00 |
| 12:00 PM (noon) | 12:00 |
| 1:00 PM | 13:00 |
| 5:30 PM | 17:30 |
| 11:59 PM | 23:59 |
This calculator supports both formats. Use whichever one matches your schedule — just make sure your start time and end time are entered in the same format for accurate results. If you are also working with time zones, visit our Time Zone Calculator for conversions across regions.
Working Hours in Different Time Periods
Use this reference table to quickly check how many hours make up a standard workday, pay period, month, or year — based on a typical 8-hour day and 40-hour week.
| Time period | Full-time (40hr/wk) | Part-time (20hr/wk) |
|---|---|---|
| One day | 8 hours | 4 hours |
| One week | 40 hours | 20 hours |
| Biweekly pay period | 80 hours | 40 hours |
| Semi-monthly (twice/mo) | ~86.67 hours | ~43.33 hours |
| One month (average) | ~173.33 hours | ~86.67 hours |
| One quarter (3 months) | ~520 hours | ~260 hours |
| One year (52 weeks) | 2,080 hours | 1,040 hours |
Note: monthly figures are averages. Actual hours vary slightly depending on how many workdays fall in each specific month. For any specific month or pay period, use the 'Hours Between Two Dates' section of this calculator to get an exact figure.
Frequently Asked Questions (FAQs)
Answers to the most common questions about calculating hours, overtime, pay periods, and time formats.
How do I calculate hours worked between two times?
Subtract the start time from the end time to find the total elapsed time. If you took an unpaid break, subtract that from the total. For example, 9:00 AM to 5:30 PM is 8 hours 30 minutes — deduct a 30-minute lunch break and your net hours worked is 8 hours exactly. This calculator performs all of that automatically.
Can this calculator handle overnight shifts that cross midnight?
Yes. If your end time is earlier than your start time — for example, starting at 10:00 PM and finishing at 6:00 AM — the calculator recognises this as a midnight crossing and returns the correct 8-hour total. There is no manual adjustment needed.
How do I calculate overtime hours?
First calculate your total hours worked using this calculator. Then compare the result against your overtime threshold — typically 8 hours per day or 40 hours per week. Any time above that threshold is overtime. Multiply your overtime hours by 1.5 (time and a half) to find your overtime pay rate, or by 2.0 if your contract offers double time.
What counts as full-time hours?
In most countries, full-time employment is defined as 35–40 hours per week. In the United States, the Fair Labor Standards Act defines full-time as 40 hours per week for overtime purposes, though individual employers may set their own definition. Part-time work is generally anything under 35 hours per week.
How many hours are in a biweekly pay period?
A biweekly pay period covers two standard workweeks. For a full-time employee on a 40-hour week, that is 80 regular hours per pay period. This is the most common pay schedule in the United States. Use the 'Hours Between Two Dates' section above to calculate the exact hours within any specific biweekly pay period.
What is the difference between gross hours and net hours worked?
Gross hours is the total time between your clock-in and clock-out, including any breaks. Net hours worked is the time remaining after unpaid breaks are deducted. For payroll purposes, most employers pay on net hours. This calculator deducts break time automatically when you fill in the optional break field.
What is the difference between 12-hour and 24-hour time format?
The 12-hour format uses AM and PM to split the day into two 12-hour cycles. The 24-hour format counts from 0:00 (midnight) to 23:59 without AM or PM. For example, 2:00 PM in 12-hour format equals 14:00 in 24-hour format. Both formats are supported in this calculator.
How do I convert minutes to decimal hours for payroll or invoicing?
Divide the minutes by 60. So 45 minutes ÷ 60 = 0.75 hours. Therefore, 7 hours and 45 minutes becomes 7.75 hours in decimal format. Most payroll software and invoicing platforms expect decimal hours rather than hours-and-minutes notation. You can also use our Time to Decimal Calculator for this conversion directly.
Can I calculate hours between two different calendar dates?
Yes. Use the 'Hours Between Two Dates' section of this calculator. Select your start date and end date alongside your times. This is useful for calculating total hours across a multi-day project, a holiday period, a billing cycle, or a pay period that spans several calendar days.
How many hours a week is considered part-time?
Part-time work is generally defined as fewer than 35 hours per week, though the exact threshold varies by country and employer. In the United States, there is no federal definition of part-time hours — individual employers determine this. Common part-time arrangements include 20, 24, or 30 hours per week.
How do I calculate hours for a rotating shift pattern?
Calculate each individual shift using this calculator, then total all shifts across the pay period. For rotating schedules — where you might work 12-hour days followed by rest days — it helps to record each shift date, start time, and end time, and calculate them one by one. Use our Time Calculator to add the results together at the end.
What is decimal time and when do I need it?
Decimal time expresses hours and minutes as a single decimal number. For example, 1 hour and 30 minutes = 1.5 hours in decimal form. You need decimal time when entering hours into payroll software, creating invoices, or filling in spreadsheets that calculate wages automatically. Our Time to Decimal Calculator converts any hours-and-minutes value to decimal in one click.
Can I use this to track hours for multiple employees?
You can use this calculator to verify each employee's hours individually. Enter each person's clock-in and clock-out times one at a time to get their daily or weekly total. For larger teams, we recommend also keeping a separate timesheet — this calculator is best used for verification and spot-checking rather than as a primary recordkeeping system.
Is this hours calculator free to use?
Yes, completely free. There is no sign-up, no account, and no download required. Enter your times, click Calculate, and your result appears instantly on any device — phone, tablet, or desktop. You can use it as many times as you need.