Hours Worked Per Week: How to Calculate

To calculate hours worked per week, add up the total time you spent on the job each day, then sum those daily totals for the seven-day period. You enter your daily start and end times (and breaks) into the calculator below, and it returns your weekly total in hours and minutes.

Formula

The calculator uses the standard workweek formula:

Weekly hours = ( (End time − Start time) × 24 × 60 − Break minutes ) ÷ 60 × Days worked

Where:

• Start time – the clock time you begin work (e.g., 9:00).
• End time – the clock time you finish work (e.g., 17:00).
• Break – total unpaid break time in minutes (e.g., 30).
• Days worked – number of days you worked that week (1–7).

The difference between end and start is a fraction of a 24-hour day (e.g., 8 hours = 0.3333 days). Multiplying by 24×60 converts it to minutes, then subtracting the break and dividing by 60 gives decimal hours. Multiply by days worked to get the weekly total.

Worked Example

Using the default values: start 9:00, end 17:00, break 30 minutes, worked 5 days.

1. End − Start = 17:00 − 9:00 = 8 hours = 8/24 = 0.3333 days.
2. 0.3333 × 24 × 60 = 480 minutes.
3. 480 − 30 break = 450 minutes of paid time per day.
4. 450 ÷ 60 = 7.5 hours per day.
5. 7.5 × 5 days = 37.5 hours per week.

The calculator shows 37.5 hours weekly and 7.5 hours daily, matching the manual calculation.

Why It Matters

Knowing your exact weekly hours is essential for several reasons:

• Payroll accuracy – salaried exempt employees may need to track hours for overtime or comp time; hourly workers must verify their pay stub matches actual time.
• Overtime thresholds – in many jurisdictions, overtime begins after 40 hours per week (or 8 hours per day in some places). A precise count tells you if you crossed the line.
• Work-life balance – studies consistently show that working more than 50 hours per week increases stress and health risks. Tracking helps you set boundaries.
• Budgeting and billing – freelancers and consultants bill by the hour; an accurate weekly total is the basis for invoices.

Even if your schedule is regular, small variations (a late start, a longer lunch) accumulate over a month. A weekly calculation catches those differences.

How to Track Your Time

You can use the calculator with data from any reliable source:

• Time clock apps – most track start/end times automatically and export weekly summaries.
• Paper timesheets – write down your start, end, and break times each day, then sum them.
• Spreadsheets – enter times in separate columns and use formulas like =(B2-A2)*24 to get hours.
• Manual memory – only reliable if your schedule is extremely consistent; otherwise, errors creep in.

For the most accurate result, record your times at the moment you start and stop, not at the end of the week. Memory tends to round in your favor, which can cause disputes with employers or underbilling with clients.

Common Mistakes and Pitfalls

Several errors frequently skew weekly hour calculations:

• Forgetting breaks – unpaid lunch or coffee breaks reduce your paid hours. If you take a 30-minute lunch and don’t subtract it, you overcount by 2.5 hours over a 5-day week.
• Mixing AM and PM – entering 7:00 instead of 19:00 for an evening shift gives a negative or absurd result. Always use 24-hour format or specify AM/PM clearly.
• Rounding too early – rounding each day to the nearest half-hour before summing can add or lose 15 minutes per day, which becomes 1.25 hours over a week.
• Ignoring overtime – if you work 9 hours on Monday and 7 on Tuesday, your weekly total is 16, but your overtime may be calculated per day or per week depending on local law. The calculator gives the raw total; check your jurisdiction’s rules.
• Not counting travel time – for most employees, commuting is not paid work. However, if you travel between job sites during the workday, that time usually counts. Know your policy.

The biggest misconception is that a “40-hour week� means 40 hours of actual work. In reality, it often means 40 hours of paid time, which excludes unpaid breaks. Your true working time may be less.

Reading the Result

The calculator outputs two numbers:

• Daily hours – your average paid hours per day, useful for checking consistency.
• Weekly hours – the total for the week, the number you compare against overtime thresholds or your contract.

If the result shows a decimal like 37.5, that means 37 hours and 30 minutes (0.5 × 60). To convert decimal hours to minutes, multiply the fractional part by 60. For example, 41.25 hours = 41 hours and 15 minutes.

This calculation assumes you work the same number of hours each day. If your days vary, you need to calculate each day separately and then sum them. The calculator here is designed for a consistent schedule; for irregular hours, use a spreadsheet or a time-tracking app that sums daily totals.

Limits of This Calculation

This formula works for a standard, single-shift day. It does not handle:

• Split shifts – if you work 4 hours in the morning and 4 in the evening, you need to enter them as two separate periods.
• Overnight shifts – if you start at 22:00 and end at 06:00 the next day, the calculator will show a negative value because the end time is earlier than the start time. In that case, add 24 hours to the end time manually.
• Overtime premiums – the result is raw hours, not pay. Overtime rates (e.g., 1.5×) are applied by your employer according to law and contract.
• Rounding rules – some employers round to the nearest 15 minutes for payroll. The calculator gives exact minutes; your pay stub may differ.

For overnight shifts, a simple workaround is to split the shift into two entries: one from start to midnight, and one from midnight to end. Or, if you use a spreadsheet, add 24 to the end time when it’s before the start time.

Frequently Asked Questions

How do I calculate hours worked if I have unpaid breaks?
Subtract the total break time (in minutes) from the total minutes between start and end, then divide by 60. For example, 9:00–17:30 with a 30-minute break gives 8.5 hours total minus 0.5 hours break = 8.0 hours.

What if I work different hours each day?
Calculate each day separately using the same formula (end − start − break), then add all daily totals together. The calculator here assumes the same daily hours for all days worked; for a varied schedule, use a spreadsheet or a time-tracking app.

Does overtime count in weekly hours?
Yes, overtime hours are part of your total weekly hours. The calculator gives the raw total; your employer then applies overtime rates to hours beyond the legal or contractual threshold (often 40).

How do I convert decimal hours to hours and minutes?
Take the decimal part and multiply by 60. For 37.75 hours, 0.75 × 60 = 45 minutes, so it’s 37 hours and 45 minutes.

Can I use this for a 24-hour shift?
Yes, but the calculator’s time inputs are limited to 0:00–23:59. For a 24-hour shift, set start to 0:00 and end to 23:59, then add 1 minute manually. Alternatively, treat it as two 12-hour shifts.

What is the difference between “hours worked� and “hours paid�?
Hours worked includes all time on duty, even if unpaid (like an on-call period). Hours paid excludes unpaid breaks and may include paid leave. This calculator computes hours worked; your paycheck reflects hours paid.

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in start | Start time (HH:MM) | - | 9:00 | 0:00 | 23:59
in end | End time (HH:MM) | - | 17:00 | 0:00 | 23:59
in break | Break (minutes) | min | 30 | 0 | 480
in days | Days worked this week | - | 5 | 1 | 7
out weekly | Weekly hours | h | ( ( (end - start) * 24 * 60 - break ) / 60 ) * days | 2
out daily | Daily hours | h | ( (end - start) * 24 * 60 - break ) / 60 | 2