The Days in Month Calculator helps you quickly find how many days are in any month, including February during leap years.
Knowing how many days are in each month is useful for planning schedules, calculating deadlines, organizing travel, managing bills, tracking subscriptions, and working with dates.
Most months contain either 30 or 31 days, while February normally contains 28 days and has 29 days during a leap year.
The complete calendar is:
January — 31 days
February — 28 days, or 29 in a leap year
March — 31 days
April — 30 days
May — 31 days
June — 30 days
July — 31 days
August — 31 days
September — 30 days
October — 31 days
November — 30 days
December — 31 days
How Many Days Are in Each Month?
The 12 months of the year do not all have the same number of days.
There are seven months with 31 days, four months with 30 days, and February has either 28 or 29 days.
Here is the full breakdown:
| Month | Number of Days |
|---|---|
| January | 31 |
| February | 28 or 29 |
| March | 31 |
| April | 30 |
| May | 31 |
| June | 30 |
| July | 31 |
| August | 31 |
| September | 30 |
| October | 31 |
| November | 30 |
| December | 31 |
Which Months Have 31 Days?
Seven months contain 31 days:
January
March
May
July
August
October
December
A useful pattern to remember is that July and August are the only two consecutive months that both have 31 days.
Which Months Have 30 Days?
Four months contain exactly 30 days:
April
June
September
November
A traditional memory phrase begins:
“Thirty days hath September, April, June and November.”
Remembering these four months makes it easier to determine the length of the remaining months.
How Many Days Are in February?
February is the shortest month of the year.
During a normal year:
February = 28 days
During a leap year:
February = 29 days
The extra day is called February 29, or leap day.
What Is a Leap Year?
A leap year contains 366 days instead of the usual 365 days.
In most cases, a year divisible by 4 is a leap year.
However, century years require an additional rule:
A year divisible by 100 is not normally a leap year unless it is also divisible by 400.
For example:
2024 = Leap year
2026 = Not a leap year
2100 = Not a leap year
2000 = Leap year
Why Do We Have Leap Years?
A calendar year of exactly 365 days is slightly shorter than the time associated with Earth’s orbit around the Sun.
The Gregorian calendar uses leap years to keep calendar dates aligned with the seasons over long periods.
The occasional extra day added to February helps correct this difference.
For authoritative information about calendars and leap years, see the U.S. Naval Observatory’s calendar resources.
How Many Days Are in a Year?
A normal year contains:
365 days
A leap year contains:
366 days
Therefore, whether February has 28 or 29 days determines whether the entire year contains 365 or 366 days.
Easy Way to Remember the Months
You can group the months by length.
31-Day Months
January, March, May, July, August, October, December
30-Day Months
April, June, September, November
February
28 days normally
29 days during a leap year
Once you remember the four 30-day months and February, all the remaining months have 31 days.
Why Knowing the Number of Days in a Month Is Useful
Knowing month lengths is useful for many everyday calculations.
Examples include:
- Calculating deadlines
- Planning holidays
- Scheduling appointments
- Tracking subscriptions
- Calculating rental periods
- Organizing work schedules
- Planning projects
- Working with financial dates
- Counting days between events
- Understanding calendar calculations
Use Our Free Days in Month Calculator
Instead of remembering every month manually, you can use the free Days in Month Calculator on LivingToolsGuide.
Select the month and year, and the calculator can tell you how many days are in that month.
This is particularly useful for February, because its length depends on whether the selected year is a leap year.
Frequently Asked Questions
Which months have 31 days?
January, March, May, July, August, October, and December each have 31 days.
Which months have 30 days?
April, June, September, and November each have 30 days.
How many days does February have?
February normally has 28 days and has 29 days during a leap year.
How many days are in a normal year?
A normal year contains 365 days.
How many days are in a leap year?
A leap year contains 366 days.
Final Thoughts
Remembering how many days are in each month makes many everyday date calculations easier.
The basic pattern is:
7 months = 31 days
4 months = 30 days
February = 28 or 29 days
For a quick answer—especially when checking February in a particular year—use the free Days in Month Calculator on LivingToolsGuide.