Due Date Calculator
Get My Due Date
Follow Your Pregnancy, Week by Week
Estimate your due date and see what is happening during each week of pregnancy.
Enter the date when your last period started. For example, if your period began on the 12th and ended on the 17th, enter the 12th.
Count from the first day of one period to the first day of the next. If one period started on March 12 and the next started on April 10, your cycle was 30 days. Use your average cycle length from the past 4 to 5 months.
Select Calculate Now to see your estimated ovulation date, fertile window and next period. These dates are estimates and can change from cycle to cycle.
Estimate your due date and see what is happening during each week of pregnancy.
Knowing when you may ovulate can help if you are trying to get pregnant. It can also help you notice patterns such as spotting, breast tenderness, cramps, bloating or changes in your sex drive.
Ovulation lasts about 12 to 24 hours after the ovary releases an egg. Sperm can live in the body for up to five days, so the fertile window is about six days: the five days before ovulation and the day of ovulation.
Speak with a doctor if you have PCOS or a thyroid condition. Also seek advice if your period is more than a week early or late, your bleeding changes a lot, or you have severe pain.
Irregular periods can be a sign that you are not ovulating regularly. Other changes may include very painful or unusually heavy or light periods, weight gain, lower sex drive, extra facial hair or acne. A doctor can help you find the cause.