How Many Work Hours in a Month? (Simple Formula)

How many work hours are in a month? The standard average is 173.33 hours, used for converting monthly salaries to hourly rates. But the actual number varies month to month depending on how many weekdays fall in it. This guide gives you both the quick average and the exact method, with examples.

The standard average: 173.33 hours

For a full-time 40-hour week, the monthly average is:

40 hours × 52 weeks ÷ 12 months = 173.33 hours per month

This is the figure payroll systems use to convert a monthly salary into an hourly rate, because it smooths out the fact that some months are longer than others. It's an average, not the exact hours of any single month.

The exact method: count the working days

For a specific month, count the actual weekdays (Monday to Friday) and multiply by your daily hours:

Working days in the month × hours per day = monthly hours

For example, a month with 22 working days at 8 hours a day is 22 × 8 = 176 hours. A month with 20 working days is 20 × 8 = 160 hours.

Why months differ

A calendar month has 28 to 31 days, and how weekends land changes the weekday count. Most months have 20 to 23 working days, so actual monthly hours range from about 160 to 184 — a swing of up to three days of work. That's why the 173.33 average exists: it evens out the variation for steady monthly pay.

When to use each

• Use 173.33 for converting a monthly salary to an hourly rate, or any steady-average calculation.
• Count actual working days when you need exact hours for a specific month — capacity planning, hourly payroll, or project budgeting.

Don't forget holidays and PTO

Both methods count every weekday. To get hours actually worked, subtract public holidays and any personal time off in that month. A month with 22 weekdays but one holiday and one vacation day is really 20 worked days, or 160 hours.

Track actual monthly hours automatically

Averages and weekday counts are estimates; what you pay and plan against should be real. Timesheet Maker totals the hours your team actually works each month — after holidays and time off — so monthly figures reflect reality instead of a calendar average.

Frequently asked questions

How many work hours are in a month? On average, 173.33 hours (40 × 52 ÷ 12). Exact hours vary from about 160 to 184 depending on the month's working days.

Where does 173.33 come from? It's the annual full-time hours (40 × 52 = 2,080) divided by 12 months, giving a consistent monthly average for payroll.

How do I calculate exact hours for a specific month? Count the weekdays in the month and multiply by your daily hours. Twenty-two working days at 8 hours is 176 hours.

Should I use 173.33 or the exact count? Use 173.33 for salary-to-hourly conversion and steady averages; count actual working days when you need a specific month's exact hours.

Pick the right number

Use 173.33 for averages, or count working days for a specific month — then subtract holidays and PTO. To track real monthly hours, try Timesheet Maker free.