Calculate the number of months, weeks, and days between two dates. Perfect for tracking project duration, subscription periods, and age calculation.
A month calculator determines the time difference between two dates, expressed in months, weeks, days, and years. Unlike simple day calculators, it accounts for varying month lengths and provides results in the most commonly used time units.
Months are tricky to calculate because they have different lengths (28-31 days). This calculator uses calendar months for accuracy, meaning January 15 to February 15 is exactly 1 month, even though that's 31 days, while February 15 to March 15 might be 28, 29, or 30 days.
Common Uses:
Select the beginning date for your calculation. This could be a birth date, project start date, or subscription start date.
Select the ending date. This could be today's date, a future deadline, or any date you want to measure up to.
The calculator shows the time difference in multiple formats: total months, years and months, weeks, days, and decimal representations.
Scenario: A baby was born on January 15, 2024. How many months old are they on October 15, 2024?
Input:
Result:
Scenario: Your annual subscription started March 1, 2024 and ends February 28, 2025.
Input:
Result:
Scenario: A construction project runs from January 10, 2024 to August 25, 2024.
Input:
Result:
The calculator counts complete calendar months from start to end date. For example, January 15 to March 14 is 1 month (not 2), because you haven't reached the 15th of the third month. Once you hit March 15, it counts as 2 complete months.
Months have different lengths (28-31 days), so 30 days doesn't always equal 1 month. Calendar months are the standard for legal, financial, and official purposes. For example, a "1-month subscription" from January 31 to February 28 is 28 days, not 30.
The calculator automatically accounts for leap years when calculating total days. February has 29 days in leap years (2024, 2028, etc.) and 28 days otherwise. Month counts aren't affected by leap years—a month is still a month.
Calendar months (used here) count actual months: Jan → Feb → Mar. 30-day months divide total days by 30. For contracts and billing, always check which method is used. Calendar months are more common for subscriptions, while 30-day months are sometimes used in finance.
Enter the birth date as the start date and today's date as the end date. Babies under 2 years are typically described in months (e.g., "18 months old"), while children 2+ are described in years (e.g., "2 and a half years old").
Yes! Enter today's date as the start and a future date as the end to calculate how many months until an event (wedding, vacation, project deadline, etc.). This helps with planning and countdown tracking.
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