Pregnancy Calculator

Calculate due date, pregnancy progress, and trimesters

Last Period

Conception Date

First day of your last menstrual period (LMP)

Estimated conception date

Average menstrual cycle length

Select your average cycle length for more accurate due date calculation

Enter your information above and click “Calculate Pregnancy Progress” to see your results

Your Pregnancy Progress

Due Date

–

Weeks Pregnant

–

Days Pregnant

–

Trimester

–

Pregnancy Progress

0% of pregnancy completed

First Trimester

Weeks: –

Baby’s major organs begin to form

Second Trimester

Weeks: –

Baby grows rapidly, movements felt

Third Trimester

Weeks: –

Final growth and preparation for birth

Key Pregnancy Dates

Start of Pregnancy: –
End of First Trimester: – (Week 13)
End of Second Trimester: – (Week 27)
Due Date: – (Week 40)

Pregnancy Calculator FAQs

Frequently Asked Questions

Find answers to common questions about pregnancy calculation and tracking

Pregnancy Calculation Questions
1 How is pregnancy calculated? Pregnancy is calculated from the first day of your last menstrual period (LMP), not from conception date.
2 How to calculate pregnancy? Use the first day of your last period plus 280 days (40 weeks) to calculate pregnancy duration.
3 How to calculate pregnancy weeks? Count weeks from the first day of your last menstrual period (LMP) to current date.
4 How to calculate pregnancy week by week? Track each week from LMP date, with pregnancy typically lasting 40 weeks total.
5 How to calculate pregnancy months by weeks? Approximately 4.3 weeks per month: 1-4 weeks = 1st month, 5-8 weeks = 2nd month, etc.
6 How to calculate pregnancy due date? Due date = First day of last period + 280 days (or 40 weeks).
7 How to calculate due date for pregnancy? Add 280 days (40 weeks) to the first day of your last menstrual period.
8 How do you calculate pregnancy due date? Use Naegele’s rule: LMP + 1 year – 3 months + 7 days.
9 How can I calculate my pregnancy week? Count weeks from first day of last period to today’s date.
10 How do I calculate my pregnancy weeks? Subtract LMP date from current date and divide by 7 to get weeks.
11 How far along am I in my pregnancy? Calculate weeks from LMP date: (Current date – LMP date) ÷ 7 = weeks pregnant.
12 How many weeks is pregnancy? Full-term pregnancy is typically 40 weeks (280 days) from LMP.
13 How are pregnancy weeks calculated? From first day of last menstrual period, each 7-day period equals one week.
14 Why is pregnancy calculated from last period? Because most women know their LMP date but not exact conception date.
15 How to calculate pregnancy from last period? Count days/weeks from first day of LMP to determine pregnancy duration.
16 How to calculate pregnancy from conception? Add 266 days (38 weeks) to conception date for estimated due date.
17 How to calculate pregnancy age? Pregnancy age is calculated in weeks from first day of LMP.
18 How to calculate weeks of pregnancy? (Current date – LMP date) ÷ 7 = weeks of pregnancy.
19 How to calculate pregnancy after miscarriage without period? Use conception date + 266 days or ultrasound measurements for accuracy.
20 When can I take a pregnancy test? After missed period or 10-14 days after conception for accurate results.
21 When should I take a pregnancy test? First morning urine after missed period gives most accurate results.
22 How soon can I take a pregnancy test? Some tests detect pregnancy 6-8 days after ovulation/fertilization.
23 When will I get a positive pregnancy test? Usually 10-14 days after conception when hCG levels are detectable.
24 How to calculate pregnancy by ovulation date? Ovulation date + 266 days (38 weeks) = estimated due date.
25 How to calculate pregnancy by intercourse date? Intercourse date + 266 days = approximate due date (if conception occurred).
26 How to calculate IVF pregnancy weeks? Embryo transfer date + 266 days OR transfer date + embryo age in days.
27 How to calculate expected date of delivery (EDD)? EDD = LMP + 280 days (40 weeks) OR ultrasound measurement.
28 How is trimester calculated in pregnancy? 1st trimester: weeks 1-13, 2nd trimester: weeks 14-27, 3rd trimester: weeks 28-40.
29 How to calculate pregnancy weeks into months? Months 1-3: weeks 1-13, Months 4-6: weeks 14-27, Months 7-9: weeks 28-40.
30 How to calculate baby weight during pregnancy? Ultrasound measurements estimate fetal weight using various formulas and measurements.