How many hours in a month — is there a standard number?

I need a reliable figure for how many hours are in a month for project and cost planning. Most months differ by days — so is 730 hours the standard professionals use, or does it vary? What number does your team rely on for consistent calculations?
 
There’s no single standard number because months have different lengths, but the average is usually considered 730 hours per month. That comes from 365 days ÷ 12 months × 24 hours. For exact values, a 30-day month has 720 hours and a 31-day month has 744 hours.
 
The standard most people use for calculations is 730 hours since it's the average across all months, but for work planning specifically a lot of teams use 160 hours based on 40 hours a week over 4 weeks.
 
There is no single standard number of hours in a month because months have different numbers of days. However, for general calculations, people often use an average. A typical month is considered about 730 hours (based on 365 days ÷ 12 months × 24 hours). In work schedules, a standard full-time month is often estimated at 160 hours (40 hours per week × 4 weeks), though some months may be slightly higher or lower depending on the exact number of workdays.
 
There is no single standard number of hours in a month, but on average a month has about 730 hours. For payroll or work calculations, companies often use around 160–176 working hours per month based on weekdays and work schedules.
 
There is no single standard number of hours in a month because months vary in length. On average, a month has about 730 hours (365 days ÷ 12 × 24). For work schedules, a full-time month is often estimated at 160–173 working hours, depending on the number of workdays.
 
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