**The average number of days in a month is 30.438. This takes into account a leap years.**

Some months have 28, others have 30 or 31. There is a leap year every 4 so Feb has 29 that year. This is important when you calclulate your hourly pay if you are on salary.

## What Factors Need to Be Taken into Consideration?

When starting the calculation of how many days are in a month, you must first consider the factors which skew the results. In most of the world, the Gregorian Calendar is followed, which states that there are 365 days in a year, and every 4 years during the leap year, there are 366. In addition to this, each month has a different number of days: seven months with 31 days , four with 30 and one with 28 (or 29 during the leap year). You must think about the effect these numbers will have on the formula before finding a final answer.

## So How Can I Carry Out the Calculation?

To calculate the average number of days in a month mathematically, you would want to find the mean. This means adding up all of the days and dividing by the number of months. So in this case:

**365/12 = 30.417**

However, if you factor in the leap year, the total number of days in a year becomes 366. So to work out the average number of days in a month, you need to know the average number of days in a year. This would be:

**365+365+365+366 = 1461**

**1461/4 = 365.25**

Then, you would carry out the same calculation as last time:

**365.25/12 = 30.438**

So there you go – the exact average number of days in a month is 30.438. Now get out there and impress your friends! Not only is this a great little party trick, but it can also be particularly useful to know the average number of days in a month as well as how the math to go with it works.

In our society, the calendar we use can often be found confusing, due to the changing number of days in each month. Whilst calculating the average number of days in a month may seem a simple task, there are lots of things to be accounted for such as leap years and the decimal number of days in a year.

Just remember, it is also great if you can remember how many days are in each month of the year as well, as they are all different. If you can get your head around the confusingly ever changing calendar we follow, life will become much easier to both plan and live.