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How is it calculated?
Months are counted on the calendar: from 15 March to 15 June is exactly 3 months, whatever the number of days. Leftover days are shown separately, and the decimal uses the length of the month they fall in.
When adding months to the 31st, the result moves to the last day of shorter months — 31 January plus 1 month is 28 or 29 February.
Common questions
How many months is 90 days?
About 3 months (2.96 on average); the exact calendar months depend on the start date.
How old is my baby in months?
Enter the birth date as the start and today as the end date.