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Months Between Dates Calculator
Count the months between two dates the way people normally mean it: whole calendar months, then the days left over. A decimal figure based on the average month length is given for calculations.
- Whole months
- 8
- Months (decimal, 30.44-day average)
- 8.84
- Years, months, days
- 8 months, 26 days
- Days
- 269
Saved setups
Save a set of inputs you reuse — your usual rate, your loan, your room sizes — and load it back in one tap.
Your recent calculations
Results you calculate here are kept on this device so you can come back to them.
Formula
How to use it
- Enter the start and end dates.
- Read whole months and remaining days, or the decimal for pro-rating.
Worked examples
January 15, 2025 to October 11, 2026
- Months between
- 20 months, 26 days
- Whole months
- 20
- Years, months, days
- 1 year, 8 months, 26 days
March 1, 2026 to March 1, 2027
- Months between
- 12 months
- Days
- 365
Why there are two answers
A month is not a fixed number of days, so “months between” has no single exact value. Leases, subscriptions and ages use calendar months. Pro-rated charges and interest often use days divided by an average month of 30.44 days (365.25 ÷ 12). Use the figure that matches the rule you are applying.
Questions people ask
How many months is 90 days?
About 2.96 average months — just under three. In calendar terms it depends on the months involved.
How many months between two dates in different years?
Multiply the difference in years by 12 and add the difference in months, then subtract one if the end day is earlier in the month than the start day.