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Lunar Month Calculator

How many months pregnant are you? Do "they" go by calendar months or lunar months or what?

Answer: there still is no standard - it all depends on who you're talking to. Some people use a calendar month as a measure: if your LMP (last menstrual period) was on the 5th of January, you're 1 month pregnant on Feb 5th, 2 months on March 5 and so on.

Still others use the 28 day "lunar calendar" - every 4 weeks, you're another month pregnant. In this case, a standard 280 day pregnancy (dating from LMP to EDD) is 10 months long! A true lunar month is 29.5306 days long (29.5 for our calculations here).

A more accurate way of telling people how far along you are - and the way your healthcare provider will probably date your pregnancy - is to use the number of weeks. But for those of you who really want to know your monthly status, here's a calculator for you. Just enter the date of the first day of your LMP below. Note: Your browser must be Java-enabled for the calculator to work.

Month: Day: Year:

End of true lunar month 1:
End of true lunar month 2:
End of true lunar month 3:
End of true lunar month 4:
End of true lunar month 5:
End of true lunar month 6:
End of true lunar month 7:
End of true lunar month 8:
End of true lunar month 9:
End of true lunar month 10:

End of 28-day 'lunar month' 1:
End of 28-day 'lunar month' 2:
End of 28-day 'lunar month' 3:
End of 28-day 'lunar month' 4:
End of 28-day 'lunar month' 5:
End of 28-day 'lunar month' 6:
End of 28-day 'lunar month' 7:
End of 28-day 'lunar month' 8:
End of 28-day 'lunar month' 9:
End of 28-day 'lunar month' 10: