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 February 5, 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 health care 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.