Empowering mothers with precise, clinical-grade pregnancy timelines and growth tracking. Sync your dates instantly to our Gynosakhi App for AI-driven obstetric care.
Find out your estimated due date, current gestational age, and baby size.
Our pregnancy algorithms, trimester calculations, and health insights are constructed based on peer-reviewed clinical guidelines and approved by certified medical practitioners.
Calculations adhere to standard clinical guidelines set by the American College of Obstetricians and Gynecologists.
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Medical resources are written and periodically updated by an expert board of OB-GYNs and child care advisors.
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As soon as a pregnancy is confirmed, calculating the due date becomes the main focus. While we often think of a pregnancy lasting exactly 9 months, the clinical reality is that gestation is calculated as 280 days (40 weeks) from the first day of your last period. Because of this, calculating a due date involves math that accounts for ovulation offsets and cycle dynamics.
This article details how our calculator computes your due date, how menstrual cycle length affects the date, and when you can expect your baby to arrive.
Most due date calculators are based on Naegele's Rule. This calculation formula assumes a standard menstrual cycle of 28 days, with ovulation occurring on Day 14. If your cycle length differs from the 28-day standard, the calculation must be adjusted:
By inputting your average cycle length in our calculator widget above, you receive a custom estimate adjusted for your cycle profile.
While calculating your due date based on your period is a fantastic starting point, your healthcare provider will likely verify this date during your first prenatal appointment using an ultrasound scan. This is called a dating scan, usually performed between weeks 8 and 14.
During the scan, the technician measures the embryo's Crown-Rump Length (CRL), which is the length from the top of the head to the bottom of the buttocks. Because embryos grow at a highly uniform rate in the first trimester, the CRL measurement provides the most accurate estimation of gestational age. If the ultrasound due date differs from the LMP due date by more than 7 days, your medical provider will update your official due date to match the ultrasound results.
It is important to remember that your due date is an estimate. In fact, only about 4% of babies are born on their exact due date. Labor is a complex biological process triggered by chemical signals from the baby's lungs and brain, which cannot be predicted to the day. Deliveries are considered normal and healthy anywhere between Week 37 and Week 42.
To log your daily symptoms and keep track of baby development milestones, download our Gynosakhi app on iOS and Android. Gynosakhi provides 24/7 AI chatbot consultations and comprehensive symptom logs to help you navigate each step of your pregnancy with ease.
Clinical Disclaimer: The calculations, timelines, and guides provided on this page are for educational and planning purposes only. They are based on clinical standards from ACOG, but do not replace professional medical advice, diagnosis, or clinical ultrasound assessments from your OB-GYN.
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Medical answers to standard queries regarding pregnancy calculations, due dates, and trimester guidelines.
EDD stands for Estimated Due Date. It is the date that pregnancy calculators and obstetricians project for your baby's spontaneous arrival, calculated at 40 weeks (280 days) of gestational age.
Statistical studies show that first-time mothers have a slightly higher likelihood of delivering past their estimated due dates. However, spontaneous labor ranges anywhere from 37 to 42 weeks.
Yes. If your cycle is irregular, standard LMP methods might be inaccurate. In these cases, our due date calculator allows adjustment for cycle length, but an early ultrasound dating scan is recommended for clinical confirmation.
Naegele's Rule is a standard clinical method that calculates your due date by taking the first day of your Last Menstrual Period (LMP), adding 7 days, subtracting 3 months, and adding 1 year. This is mathematically equivalent to adding 280 days to your LMP.
LMP-based calculations assume a standard 28-day cycle with ovulation on day 14. Because cycle lengths and ovulation times vary, the accuracy is around +/- 7 to 10 days, which is why doctors verify the date using an early ultrasound.
If an early ultrasound scan (crown-rump length measurement) indicates a pregnancy age that differs from your LMP calculation by more than 7 days, your doctor will adjust your official due date to match the ultrasound, as it is considered more biologically accurate.
A pregnancy is considered full-term when it reaches 39 weeks. Delivery between 39 weeks 0 days and 40 weeks 6 days is classified as full-term. Deliveries between 37 and 38 weeks are 'early term,' and deliveries at 41 weeks are 'late term.'
A pregnancy is classified as post-term (overdue) when it reaches 42 weeks (294 days) or more. Obstetricians in India and globally generally monitor overdue pregnancies closely and recommend induction by week 41 or 42 to prevent complications.
You can schedule a planned C-section or induction for medical reasons or convenience in consultation with your doctor. However, standard clinical guidelines recommend waiting until at least 39 weeks of pregnancy unless there is a medical necessity, to ensure the baby's lungs and brain are fully matured.
Once you compute your due date here, you can open the Gynosakhi app on your phone, enter your Estimated Due Date (EDD) or LMP in the profile section, and the app will instantly sync your timeline to show daily growth updates.
