📅 Pregnancy Due Date Calculator
Enter your LMP date to find your baby's due date and current pregnancy week
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How is the due date calculated?
Your due date is estimated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is known as Naegele's rule and is the most common method used by doctors worldwide.
This calculator provides an estimate only. Please consult your doctor or gynecologist for accurate medical advice and confirmation of your pregnancy timeline.
How to use this tool
Uses Naegele's Rule. The standard medical formula worldwide. Takes 30 seconds.
- 1Enter your Last Menstrual Period (LMP) date
The first day your last period started. Not when it ended. Check your period app if unsure.
- 2Enter your average cycle length
Default is 28 days. Update if your cycle is shorter or longer for a more accurate result.
- 3Click Calculate Due Date
Your due date, current week. Plus trimester and countdown appear instantly.
- 4Save or screenshot your results
Take a screenshot to share with your doctor. Return anytime to check your current week.
Your first ultrasound can shift the due date by a few days. This is normal. Ultrasound dating is more accurate if they differ by more than 5 days.
Your due date is an estimate. Babies born between 37 and 42 weeks are full-term. Do not stress if your date changes slightly.
Frequently Asked Questions
How accurate is this calculator?
What if I do not know my LMP date?
My cycle is not 28 days. Does this matter?
Can I use this for IVF?
How pregnancy due date estimation care actually works in India
Indian healthcare for babies works on two parallel systems. Middle class families typically have a private pediatrician on call. Apollo, Fortis, Max, Manipal, Cloudnine have pediatric specialty centres in metros. Smaller cities have local trusted pediatricians who often see three generations of the same family. Government Primary Health Centres provide free care for everyone. Consultation fees at private pediatricians range from rupees 400 to 1500 in metros. Government hospitals are free, queues can be long. Many private pediatricians give WhatsApp consultations for after hours stuff. This is uniquely convenient and worth asking about when picking your pediatrician. The IAP has been updating its guidelines to match international evidence on fever management, medication choice, and the limited role of sponging.
For emergencies in India: 112 (national emergency) or 102 (ambulance). For non-emergency child health concerns, call your pediatrician directly. Many hospital chains like Apollo, Fortis, and Max offer 24/7 telephone consultations for registered patients.
What Indian moms actually deal with
Indian families bring extra layers of advice when baby is sick. Maternal grandmother arrives within hours, often with old remedies. Mother in law has opinions. The aunties WhatsApp group has more opinions. The neighbour with no medical training also has thoughts. Most of this advice is well meaning. Some is outdated. None should replace your pediatrician. Use traditional comfort measures like haldi milk for older babies, tulsi water, light steam, these are fine alongside medical care. Just not as replacements when actual medication is needed. The cultural pressure to refuse modern medication is real and sometimes harmful. Crocin and Calpol when properly dosed are among the safest pediatric medications studied. The simple line "doctor said this is necessary" usually settles cultural disagreements about giving paracetamol.