Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). Another way to do it is to subtract three months from the first day of your last period and add seven days.

What is the formula for calculating due date?

Calculating a Due DateFirst, determine the first day of your last menstrual period.Next, count back 3 calendar months from that date.Lastly, add 1 year and 7 days to that date.

What is the formula for calculating monthly payments?

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