Due Date Calculator

Pregnant? Or think you might be? Use this tool to calculate your baby’s approximate due date. Just enter the first day of your most recent menstrual cycle below.

What was the first day of your last period?

< May 2013 >
Sun	Mon	Tue	Wed	Thu	Fri	Sat
28	29	30	1	2	3	4
5	6	7	8	9	10	11
12	13	14	15	16	17	18
19	20	21	22	23	24	25
26	27	28	29	30	31	1
2	3	4	5	6	7	8

Note: Use this calculator as a helpful guide only – please consult your healthcare provider for more detailed information.

Your due date is calculated using a menstrual cycle length of 28 day and is estimated by adding 280 days (40 weeks) to the approximate first day of your last menstrual period. The range of time between conception and birth can vary from 38 weeks to 42 weeks, depending on the length of your menstrual cycle and the first day of your last period. Remember that only 5% of women deliver their babies on their estimated due date.