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The Work Hours Calculator computes your net working hours per day, week, month, and year based on your start time, end time, and break duration. Whether you are tracking a standard 9-to-5 schedule, a flexible shift, or a part-time arrangement, this calculator gives you an accurate picture of total hours worked and potential earnings.
Knowing your exact work hours matters for many reasons. Employees use it to verify paycheck accuracy, especially when overtime rules or shift differentials apply. Freelancers and contractors rely on precise hour tracking to invoice clients correctly. Managers use aggregate hour data to forecast labor costs and plan staffing. Students balancing part-time jobs need to ensure their schedules stay within limits set by school policies or visa requirements.
The distinction between gross and net hours is important. If your shift runs from 9:00 AM to 5:30 PM, that is 8.5 gross hours. Subtract a 30-minute unpaid lunch break and you have 8.0 net hours — the hours you are actually compensated for. This calculator automatically computes the net figure so your results reflect your actual billable or compensable time.
For weekly, monthly, and annual projections, the calculator assumes a consistent schedule repeated across the year. Monthly hours are estimated as weekly hours multiplied by 52/12 (approximately 4.33 weeks per month) rather than a flat 4 weeks, giving a more accurate average that accounts for months with extra partial weeks. Annual hours multiply weekly hours by 52 working weeks, without adjusting for holidays — add those separately if needed.
The optional hourly rate field allows you to see your daily pay at a glance. Enter your gross hourly wage to see the daily pre-tax earnings your schedule generates. This is useful for comparing job offers, evaluating whether a given schedule meets your income target, or simply satisfying curiosity about how much your time is worth per shift.
Use this calculator alongside the Time Card Calculator for multi-day tracking, or pair it with the Meeting Cost Calculator to understand the full cost of your workday broken into different activities.
The calculator converts start and end times to total minutes, subtracts break duration, and divides by 60 to get net hours. Net hours = (end_time_minutes - start_time_minutes - break_minutes) / 60. Weekly hours multiply daily net hours by days per week. Monthly hours use the factor 52/12 for calendar accuracy. Annual hours multiply weekly hours by 52. Daily pay multiplies net hours by your hourly rate.
A standard full-time schedule of 8 net hours/day x 5 days = 40 hours/week = 173.3 hours/month = 2,080 hours/year. If your hours per year fall below 2,080, you are working part-time relative to the US full-time standard. Above 2,080 suggests overtime or extra days. The daily pay figure is gross (before taxes and deductions).
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A 9-5 job with a 30-minute unpaid lunch = 7.5 net hours/day, not 8
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Evening shifts with no break: 4.5 net hours x 3 days = 13.5 hours/week
Subtract your break duration from the total time between start and end. Example: 9:00 AM to 5:30 PM = 510 minutes gross; minus 30-minute lunch = 480 minutes = 8.0 net hours.
A flat 4 weeks/month underestimates. There are 52 weeks per year divided by 12 months = 4.333 weeks/month. At 40 hours/week: 40 x 4.333 = 173.3 hours/month is more accurate.
Not directly — if your end time is before your start time (e.g., 10 PM to 6 AM), the result will be negative. For overnight shifts, calculate the two segments separately and add them.
In the US, federal law (FLSA) requires overtime pay (1.5x) for hours over 40 per week. Some states also have daily overtime rules (over 8 hours/day). Your net hours figure is what matters for these calculations.
A standard full-time employee works 2,080 hours/year (40 hours/week x 52 weeks). This does not deduct holidays or vacation — actual hours worked are typically 1,800-1,950 after accounting for time off.
It depends on whether it is paid. Unpaid breaks should be subtracted from your total — that is why this calculator has a break duration field. Paid breaks (like a 15-minute coffee break) would not be deducted.
Use this calculator for a single day's pattern, then refer to the Time Card Calculator if your hours vary day by day. That tool lets you enter different start/end times for each day of the week.
Work hours are all hours on the job. Billable hours are the subset charged to clients — excluding internal meetings, admin tasks, and non-project time. The Billable Hours Calculator handles that distinction.
37.5 hours/week x 4.333 weeks/month = approximately 162.5 hours/month. Many UK and European employers use 37.5 hours/week as the standard full-time contract.
Yes — enter your hourly rate in the advanced section to see daily gross pay. For weekly/monthly pay, multiply the daily result by your days per week or use the hours figures with your rate separately.
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The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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