Pregnancy Calculator
Know your due date, how many weeks pregnant you are, your trimester and every important milestone – in seconds. Works with your last period, conception date, IVF transfer, ultrasound or known due date.
- 5 ways to calculate – LMP, conception, IVF (day 3/5/6), ultrasound or due date
- Personal timeline of scans, tests and milestones, with calendar download
- 100% private – nothing you enter ever leaves your device
Calculate your due date
Choose the details you know.
Estimates only – your doctor may adjust dates after an ultrasound.
Pregnancy in numbers
Four facts that explain almost everything a pregnancy calculator tells you.
Counted from the first day of your last period – that’s 40 weeks, or about 9 months and 1 week.
Most babies arrive in the five weeks between 37 and 42 weeks. Think of your due date as a due month.
Weeks 1–13, 14–27 and 28 to birth – each with its own changes, scans and to-dos.
The WHO recommends at least eight check-ups; free visits are available under PMSMA in India.
More pregnancy calculators
From trying to conceive to your final weeks – each tool comes with a clear explanation of how it works.
Pregnancy Week Calculator
How many weeks pregnant am I?
OpenGestational Age Calculator
GA on any date
OpenLMP Calculator
From your last period
OpenIVF Due Date Calculator
Day 3 & Day 5 transfers
OpenConception Calculator
When did I conceive?
OpenOvulation Calculator
Fertile window & cycles
OpenPregnancy Test Calculator
When to test
OpenWeight Gain Calculator
Healthy gain by week
OpenTrimester Calculator
Which trimester am I in?
OpenHow the pregnancy calculator works
Behind the simple form is the same arithmetic your gynaecologist uses.
Pick what you know
Your last period is enough for most people. Had IVF or a dating scan? Use those for extra precision.
We find your “day 0”
Every method is converted to an LMP-equivalent date, then 280 days are added for your due date – adjusted for your cycle length.
See your whole pregnancy
Weeks and days, trimester, month, days to go, conception window and a timeline of scans and tests – ready to save or share.
Your pregnancy roadmap
The key moments of a typical pregnancy, week by week. Enter your dates above to see the exact calendar dates for yours.
Positive pregnancy test
hCG becomes detectable around your missed period. Start or continue folic acid.
First visit & dating scan
Heartbeat is usually seen; routine blood tests and your MCP card.
NT scan & double marker
Time-sensitive first-trimester screening for chromosomal conditions.
Second trimester begins
Nausea eases; iron-folic acid and calcium tablets usually start.
Anomaly (Level-II) scan
The detailed check of your baby’s organs, growth and placenta.
Glucose tolerance test
Screening for gestational diabetes; 24 weeks is also the viability milestone.
Tdap / Td vaccination
Given as advised to pass protection against whooping cough to your baby.
Growth scan & kick counts
Check-ups every 2 weeks; start paying daily attention to movements.
Early term
Hospital bag packed, transport planned, documents ready.
Due date
Your doctor will monitor you closely and discuss a plan if labour hasn’t begun by 41 weeks.
Understanding your results
Due date (EDD)
Your estimated date of delivery is when you reach 40 weeks 0 days. Think of it as the centre of a window: babies born from 37 to 42 weeks are within the normal range, and only a small minority arrive on the day itself.
Weeks + days
Doctors write gestational age as “12w 3d” or “12+3” – 12 complete weeks plus 3 days, counted from the first day of your last period. At 12+3 you are in your 13th week.
Trimesters and months
| Stage | Weeks | Months |
|---|---|---|
| ● First trimester | 1–13 | 1–3 |
| ● Second trimester | 14–27 | 4–6 |
| ● Third trimester | 28–40+ | 7–9 |
The two-week head start
Because counting starts at your last period, you are already “2 weeks pregnant” when you conceive and about 4 weeks pregnant when your period is missed. Read more in how pregnancy is calculated.
Conception date
The calculator estimates conception as your likely ovulation day. Because sperm can survive up to five days, the pregnancy could have begun from intercourse on any day of the fertile window – so treat it as a range, not an exact date.
Had an early scan? If it gave a different due date, use the Ultrasound or Due date tab so everything matches your doctor’s dates.
How big is your baby?
From a lentil to a jackfruit – your baby’s approximate size at key weeks, compared with everyday Indian fruits and vegetables.
Average sizes; length is crown-to-rump until 20 weeks and head-to-heel after that. Every baby grows at their own pace.
The three trimesters, explained
What’s happening with your baby, what you may feel, and what to do in each stage.
First trimester
Your baby
Every major organ forms. The heart starts beating around week 6, and by week 13 your baby is about 7 cm long, with fingers, toes and working reflexes.
Your body
Nausea, tiredness, sore breasts and frequent urination are common, driven by rising hCG and progesterone.
To-do list
- Confirm pregnancy and register (MCP card)
- Folic acid 400 mcg daily
- Dating scan and routine blood tests
- NT scan + double marker at 11–13+6 weeks
- Avoid alcohol, tobacco and unprescribed medicines
Second trimester
Your baby
Your baby grows from about 9 cm to 37 cm, starts to hear, swallows amniotic fluid and settles into sleep–wake cycles.
Your body
Energy returns and the bump shows. You’ll feel first movements, and may notice backache, heartburn or leg cramps.
To-do list
- Iron-folic acid and calcium tablets daily
- Anomaly scan at 18–22 weeks
- Glucose tolerance test at 24–28 weeks
- Start pelvic floor exercises
- Sleep on your side
Third trimester
Your baby
Your baby gains most of their birth weight, the lungs and brain mature, and most turn head-down by about 36 weeks.
Your body
Breathlessness, swelling, poor sleep and Braxton Hicks tightenings are common. Visits become more frequent.
To-do list
- Notice baby’s movements every day
- Tdap/Td vaccine and anti-D if Rh-negative
- Growth scan as advised
- Pack your hospital bag by 36 weeks
- Learn the signs of labour
Changing bra size during pregnancy
Your breasts often grow by one or two cup sizes during pregnancy, and change again once your milk comes in. A well-fitting bra eases tenderness, supports your back and makes night feeds more comfortable. Measure again each trimester and once more after birth.
Pregnancy week by week
Tap any week to see how your baby is growing and what to expect.
Call your doctor straight away if you have
- Vaginal bleeding or a gush or trickle of fluid
- Severe abdominal pain, or one-sided pain in early pregnancy
- Severe headache, blurred vision, or sudden swelling of face and hands
- Your baby moving less than usual, or a change in the pattern
- Fever, burning urine, or vomiting that stops you keeping fluids down
- Regular tightenings or period-like pain before 37 weeks
Emergency: call 108 (ambulance) or 102 (free pregnancy transport in most states).
Pregnancy care in India: good to know
- Register early with your ASHA worker, Anganwadi or health centre to get your Mother & Child Protection (MCP) card.
- Free check-ups on the 9th of every month at government facilities under PMSMA.
- Free delivery, including caesarean, medicines, tests, food and transport, in public hospitals under JSSK.
- Iron-folic acid for at least 180 days from the second trimester helps prevent anaemia.
- Sex determination is illegal under the PCPNDT Act – every child is equally welcome.
Read more: government schemes for pregnant women.
Latest from the blog
Practical checklists and down-to-earth advice for every stage – freshly written for Indian parents.
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Hospital Bag Checklist for Delivery: What to Pack (India)
A complete, practical hospital bag checklist for delivery in India – documents, clothes and essentials for mom, baby and partner, for normal or C-section birth.
Morning Sickness: 15 Remedies That Actually Help
Evidence-based morning sickness remedies – from ginger and small meals to acupressure and safe medicines – plus warning signs of hyperemesis gravidarum.
Pregnancy guides
In-depth, evidence-based answers to the questions parents ask most.
How Is Pregnancy Calculated?
Why pregnancy is counted from your last period, how Naegele’s rule works, and how doctors adjust dates for cycle length, IVF and ultrasound.
OpenHow Many Weeks Pregnant Am I?
Three simple ways to work out how many weeks pregnant you are – from your last period, your due date or a scan – with examples and a quick lookup table.
OpenWhat Is EDD in Pregnancy?
EDD means Estimated Date of Delivery. Learn how EDD is calculated, what EDD by LMP vs EDD by USG means on your report, and how likely birth on the EDD is.
OpenEarly Signs of Pregnancy
The earliest signs of pregnancy – from a missed period and breast changes to nausea and fatigue – when they start, and when to take a test.
OpenPregnancy Check-ups, Scans & Tests: The Complete Schedule
Week-by-week schedule of antenatal visits, scans, blood tests and vaccines in pregnancy in India – NT scan, anomaly scan, OGTT and Td/Tdap.
OpenLMP vs Ultrasound Due Date
Why your LMP due date and ultrasound due date differ, which one doctors trust, the official re-dating thresholds, and what it means for you.
OpenPregnancy words, decoded
The terms you’ll see on scan reports and antenatal cards, in plain language.
- LMP
- Last menstrual period – specifically its first day. The starting point for dating a pregnancy.
- EDD
- Estimated date of delivery – the day you reach 40 weeks. Also called the due date.
- Gestational age (GA)
- How far along a pregnancy is, in weeks and days from the LMP, written like 20w 3d or 20+3.
- hCG
- Human chorionic gonadotropin – the hormone detected by pregnancy tests, made by the developing placenta.
- CRL
- Crown-rump length – the baby’s length measured on an early scan, used to date the pregnancy accurately.
- NT scan
- Nuchal translucency scan at 11–13+6 weeks that, with blood tests, screens for chromosomal conditions.
- Anomaly scan
- Also called Level-II or TIFFA – a detailed ultrasound at 18–22 weeks checking the baby’s organs.
- OGTT
- Oral glucose tolerance test – screens for gestational diabetes, usually at 24–28 weeks.
- Braxton Hicks
- Irregular, usually painless ‘practice’ tightenings of the uterus from mid-pregnancy.
- Quickening
- The first movements of the baby you can feel, usually between 16 and 22 weeks.
- Term
- A birth from 37w 0d. Full term is 39w 0d – 40w 6d; post-term is 42 weeks or more.
- Rh-negative
- A blood group that may need an anti-D injection in pregnancy to protect future babies.
Frequently asked questions
How does this pregnancy calculator work?
It uses the same rules doctors use. From your last period it adds 280 days (40 weeks), adjusting for your cycle length. From a conception date it adds 266 days; from an IVF transfer it adds 266 days minus the embryo’s age; and from an ultrasound it counts forward from the gestational age on your scan report.
How accurate is a pregnancy calculator?
The maths is exact, but every due date is an estimate: only about 4–5% of babies are born on their due date, and most arrive within two weeks either side. A first-trimester ultrasound is the most accurate way to date a pregnancy.
How many weeks pregnant am I?
Enter the first day of your last period above. The calculator shows how many weeks and days pregnant you are today, which trimester and month you’re in, and links to what’s happening this week.
Why am I ‘2 weeks pregnant’ when I conceived?
Pregnancy is dated from the first day of your last period, which is roughly two weeks before ovulation and conception. This shared starting point is used for every scan chart and due date.
How many days is a full-term pregnancy?
The standard is 280 days (40 weeks) from the first day of the last period, or about 266 days from conception. Any birth from 37 weeks 0 days is considered term.
When will I hear my baby’s heartbeat?
A flickering heartbeat is often visible on a transvaginal scan from about 6–7 weeks. It can usually be heard with a hand-held Doppler from around 10–12 weeks.
When will I feel my baby move?
Most first-time mothers feel the first flutters between 18 and 22 weeks; those who have been pregnant before often notice them earlier, from about 16 weeks.
What if my periods are irregular?
Choose your usual cycle length for a rough estimate, then use the Ultrasound tab once you have a dating scan – it’s far more accurate for irregular cycles or PCOS.
Can I use this calculator after IVF?
Yes. Choose the IVF tab and enter your embryo transfer date and whether it was a day-3, day-5 or day-6 embryo. It works for fresh and frozen transfers.
Can this calculator tell me my baby’s gender?
No. No calculator can predict a baby’s sex, and prenatal sex determination is illegal in India under the PCPNDT Act. We focus on dates and your baby’s development instead.
Is my data safe?
Yes. All calculations happen in your browser. We never see, store or share the dates you enter.
Does this replace my doctor’s advice?
No. The calculator helps you understand your dates and plan ahead, but your doctor’s dates and advice always come first – especially if they have adjusted your due date after a scan.
Medical disclaimer: The results and information on this page are estimates for general education only. They are not a diagnosis and do not replace advice from your gynaecologist, obstetrician or midwife. If you have pain, bleeding, reduced baby movements or feel unwell, contact your doctor or call 108 immediately. Read the full disclaimer.
Sources & further reading
- American College of Obstetricians and Gynecologists (ACOG). Committee Opinion No. 700: Methods for Estimating the Due Date. acog.org
- ACOG. Committee Opinion No. 579: Definition of Term Pregnancy.
- World Health Organization. WHO recommendations on antenatal care for a positive pregnancy experience (2016). who.int
- Ministry of Health & Family Welfare, Government of India. Maternal health guidelines, PMSMA and Anemia Mukt Bharat. nhm.gov.in
- Mittendorf R, et al. The length of uncomplicated human gestation. Obstet Gynecol 1990;75:929–32.