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Pregnancy Calculator

Find your due date, how far along you are, your trimester and a week-by-week calendar from your last period, due date or conception date.

days

Days from the first day of one period to the first day of the next.

The date to measure the pregnancy on, for example today.

Estimated due date

Tue, Jul 8, 2025

Gestational age
15 weeks 1 day
Trimester
Second trimester
Estimated conception
Tue, Oct 15, 2024
Time until due date
174 days (24 weeks 6 days)
Pregnancy start (week 1, day 1)
Tue, Oct 1, 2024
First trimester ends
Mon, Jan 6, 2025
Second trimester ends
Mon, Apr 14, 2025
Full term (39 weeks)
Tue, Jul 1, 2025

This result is not medical advice.

Pregnancy calendar

WeekDatesTrimesterMilestone
Week 1Oct 1 – Oct 7, 2024First
Week 2Oct 8 – Oct 14, 2024First
Week 3Oct 15 – Oct 21, 2024First
Week 4Oct 22 – Oct 28, 2024FirstPeriod is due; a home test can usually detect pregnancy
Week 5Oct 29 – Nov 4, 2024First
Week 6Nov 5 – Nov 11, 2024FirstHeartbeat is often visible on ultrasound
Week 7Nov 12 – Nov 18, 2024First
Week 8Nov 19 – Nov 25, 2024FirstEarly prenatal visit and dating scan are common
Week 9Nov 26 – Dec 2, 2024First
Week 10Dec 3 – Dec 9, 2024First
Week 11Dec 10 – Dec 16, 2024First
Week 12Dec 17 – Dec 23, 2024FirstFirst-trimester screening window (weeks 11–14)
Week 13Dec 24 – Dec 30, 2024First
Week 14Dec 31 – Jan 6, 2025FirstSecond trimester begins
Week 15Jan 7 – Jan 13, 2025Second
Week 16Jan 14 – Jan 20, 2025Second
Week 17Jan 21 – Jan 27, 2025Second
Week 18Jan 28 – Feb 3, 2025SecondDetailed anatomy scan window opens (weeks 18–22)
Week 19Feb 4 – Feb 10, 2025Second
Week 20Feb 11 – Feb 17, 2025SecondHalfway point
Week 21Feb 18 – Feb 24, 2025Second
Week 22Feb 25 – Mar 3, 2025Second
Week 23Mar 4 – Mar 10, 2025Second
Week 24Mar 11 – Mar 17, 2025SecondGlucose screening window opens (weeks 24–28)
Week 25Mar 18 – Mar 24, 2025Second
Week 26Mar 25 – Mar 31, 2025Second
Week 27Apr 1 – Apr 7, 2025Second
Week 28Apr 8 – Apr 14, 2025SecondThird trimester begins
Week 29Apr 15 – Apr 21, 2025Third
Week 30Apr 22 – Apr 28, 2025Third
Week 31Apr 29 – May 5, 2025Third
Week 32May 6 – May 12, 2025ThirdGrowth checks and birth-plan talks are common
Week 33May 13 – May 19, 2025Third
Week 34May 20 – May 26, 2025Third
Week 35May 27 – Jun 2, 2025Third
Week 36Jun 3 – Jun 9, 2025ThirdWeekly visits are common from here
Week 37Jun 10 – Jun 16, 2025ThirdEarly term begins
Week 38Jun 17 – Jun 23, 2025Third
Week 39Jun 24 – Jun 30, 2025ThirdFull term begins
Week 40Jul 1 – Jul 7, 2025ThirdEstimated due date week

About the pregnancy calculator

A full-term pregnancy lasts about 40 weeks, counted from the first day of your last menstrual period (LMP). Because ovulation and conception happen about two weeks later, the first two weeks of "pregnancy" are before you were actually pregnant. This calculator follows the same convention that doctors and midwives use.

Choose how you want to start: from your last period, from a known due date, or from a conception date. Pick the date you want to measure on and the calculator shows your gestational age in weeks and days, your trimester, the estimated conception date, how many days remain until the due date, and a week-by-week calendar with typical milestones.

Only about 4 percent of babies arrive on their due date, and a healthy birth any time from week 37 to week 42 is considered normal. Ultrasound dating early in pregnancy is usually more accurate than a calculation from your last period.

Formula

  • Due date = first day of last period + 280 days (+ cycle length − 28 days if your cycle is not 28 days)
  • Due date = conception date + 266 days
  • Gestational age = as-of date − (due date − 280 days)
  • Trimesters: 1st to week 13, 2nd weeks 14–27, 3rd week 28 onward

Example

With a last period starting on October 1, 2024 and a 28-day cycle, the due date is July 8, 2025. On January 15, 2025 you would be 15 weeks and 1 day pregnant, in the second trimester.