Monthly Hours Worked Calculator
Count the working days in any month and turn them into hours worked — any working week, hours per day or per week, unpaid breaks, US, Mexican or Spanish public holidays, your own days off, partial months, overtime and pay — with a week-by-week and a whole-year table.
How it works
working days = the days of your working week (Mon–Fri, Mon–Sat, Mon–Thu, Sun–Thu or all 7) between the first and last day counted − public holidays − your days off − vacation or sick days · hours per day = hours per day − unpaid break, or hours per week ÷ working days per week · total hours = working days × hours per day + overtime · average month = hours per week × 52 ÷ 12 · pay = regular hours × rate + overtime × rate × multiplier · hourly rate from salary = monthly salary ÷ regular hours (overtime excluded)
Rather than assume a flat "160-hour month", this counts the actual working days on the calendar for the month and year you pick, because months hold anywhere from 20 to 23 weekdays. Choose your working week (five, six, four days or every day, including a Sunday–Thursday week), then enter your hours either per day — with any unpaid break taken off — or per week, which are spread evenly over your working days. Under More options you can remove US, Mexican or Spanish public holidays, list your own days off (day numbers such as 24 or 28-30, or full dates), subtract vacation or sick days, count only part of the month for a start or leaving date, and add overtime. Enter an hourly rate to get the month’s gross pay with overtime at your multiplier, or a monthly salary to see what you really earn per hour this month compared with an average month (hours per week × 52 ÷ 12, such as 173.33 hours for 40 a week). Tables break the month down week by week and show every month of the year, so you can see which months are longest.
Worked example
September 2026 has 30 calendar days, of which 22 are weekdays (Mon–Fri). At 8 hours a day that is 176 hours worked — the equivalent of 4.4 standard 40-hour weeks. Removing US federal holidays takes out Labor Day (September 7), leaving 21 days and 168 hours; at $20 an hour that is $3,360 gross. An average month on a 40-hour week is 40 × 52 ÷ 12 = 173.33 hours, so a $3,500 monthly salary works out to $20.83 an hour this month (168 hours) but $20.19 on an average month.
Sources: U.S. Office of Personnel Management — Federal holidays · Ley Federal del Trabajo (México), art. 74 — Cámara de Diputados
Frequently asked questions
Does it remove public holidays?
Yes, if you choose your country under More options: US federal holidays (with the Friday/Monday observed rule), Mexico’s official rest days or Spain’s national holidays. Regional or company holidays can be typed as days off — day numbers like 24 or 28-30 for the selected month, or YYYY-MM-DD dates.
Why do monthly hours vary between months?
Months contain different numbers of weekdays — usually 20 to 23 — depending on their length and which day the first falls on. Counting the real calendar is more accurate than assuming a fixed 160 or 173.33 hours every month; the year table shows the spread.
What is 173.33 hours?
It is the average month for a 40-hour week: 40 × 52 weeks ÷ 12 months. Payroll often uses it to turn a monthly salary into an hourly rate. The calculator shows the average for your own weekly hours next to the actual hours of the month you pick.
Should I enter hours per day or per week?
Use per day when every working day has the same shift (you can subtract an unpaid break). Use per week when you know your contract hours, such as 37.5 or 48 a week; they are divided evenly across your working days.
What is the full-time-equivalent line?
It divides your total hours by 40 to show how many standard full-time work-weeks the month represents. Two people at half those hours would together make up that many FTE weeks.
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This calculator is for educational purposes. Double-check important results before acting on them.