⚠️ Medical Disclaimer: These tools are for educational purposes only and are not medical advice. Please consult your GP, child health nurse, or healthcare provider for any health concerns.
Free Tool

Pregnancy Due Date Calculator

Find your baby's estimated due date, current pregnancy week. Plus trimester and countdown to delivery. Instantly and for free.

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For Aussie mums, the due date shapes your antenatal care through Medicare and your private cover if you have it. This calculator uses Naegele rule (LMP plus 280 days) which is what your GP and obstetrician will use. We show the dating scan window, key appointment timing, and Medicare-relevant milestones. We also flag the maternity leave calculation triggers under Australian government Paid Parental Leave.

📅 Pregnancy Due Date Calculator

Enter your LMP date to find your baby's due date and current pregnancy week

Estimated Due Date
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Current
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Trimester
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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.

Step-by-Step Guide

How to use this tool

Uses Naegele's Rule. The standard medical formula worldwide. Takes 30 seconds.

  1. 1
    Enter your Last Menstrual Period (LMP) date

    The first day your last period started. Not when it ended. Check your period app if unsure.

  2. 2
    Enter your average cycle length

    Default is 28 days. Update if your cycle is shorter or longer for a more accurate result.

  3. 3
    Click Calculate Due Date

    Your due date, current week, trimester, and countdown appear instantly.

  4. 4
    Save or screenshot your results

    Take a screenshot to share with your doctor. Return anytime to check your current week.

💡 Did your doctor give a different date?

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.

⚠️ Only 5% of babies arrive on their due date

Your due date is an estimate. Babies born between 37 and 42 weeks are full-term. Do not stress if your date changes slightly.

FAQ

Frequently Asked Questions

Uses Naegele's Rule. The standard medical method worldwide. Accurate to within a few days for regular cycles. Your first ultrasound (8-12 weeks) will confirm or refine the date.
Check your period tracking app (Flo, Clue). Your doctor can calculate your due date from an early ultrasound scan.
Yes. Our calculator accounts for this. Women with shorter cycles ovulate earlier, those with longer cycles ovulate later. Enter your actual cycle length.
For IVF, the due date is based on embryo transfer date. Day 5 blastocyst: add 261 days. Day 3 transfer: add 263 days.
Healthcare in Australia

How pregnancy due date estimation care actually works in Australia

Australian pediatric care runs through a mixed public-private system. Medicare covers GP visits and public ED visits. Many families also have private health insurance for faster specialist access. Your first call for after hours fever or illness is typically Healthdirect on 1800 022 222. Free, 24/7 nurse line. The Maternal and Child Health Nurse system is one of the best in the world. Free and accessible. Royal Childrens Hospital Melbourne, Westmead in Sydney, Queensland Childrens, Perth Childrens. These are the specialty ED centres for serious cases. For rural and remote families, telehealth through 13Health in Queensland or HealthDirect federally is critical. Royal Flying Doctor Service covers the genuinely remote stuff.

📞 Emergency contacts in Australia

In Australia, call Healthdirect on 1800 022 222 for free 24/7 health advice. For emergencies, call 000. Maternal and Child Health Nurses (free service in most states) can also help during business hours. Your GP is your first point of contact for ongoing concerns. The Tresillian Parent Helpline (1300 272 736) also handles concerns about babies.

Context for Australian families

What Australian mums actually deal with

Aussie mums tend to be pragmatic about baby illness. Cultural default leans toward "she will be right." Combined with reasonable access to nurses and GPs, this generally works. The Maternal and Child Health Nurse system is a treasure of the Australian health system. Use it without hesitation. Telehealth normalised during COVID and stayed normalised, which is genuinely useful. The unique Aussie concerns are bushfire smoke season and extreme summer heat. Babies are more vulnerable to air quality than adults. Sun and heat exposure can cause apparent fever via overheating. Always check core temperature properly (rectal or under-arm thermometer), not just the forehead, especially in summer.

More FAQs for Australia

Australian-specific questions

In Aussie practice, government Paid Parental Leave provides up to 20 weeks at the minimum wage rate for eligible birth parents. Your due date sets the eligibility window. You must have worked at least 330 hours in the 10 of the 13 months before your babys birth date. Apply through Services Australia (Centrelink) anytime from 3 months before due date. Employer-paid leave is separate and varies by employer.
Medicare in Australia covers a 12-week dating/nuchal translucency scan and 20-week morphology scan for most pregnancies. Additional scans for medical indications are also covered. Your obstetrician or GP refers you. Bulk-billed scans cost nothing out of pocket; non-bulk-billed clinics may have gap fees of A$50 to A$200. Your due date sets the timing of these appointments.
In Aussie practice, you can choose midwifery group practice (MGP), shared care with your GP, private obstetrician, or public hospital antenatal clinic. Your due date and pregnancy risk profile help you decide. MGP is excellent for low-risk pregnancies and offers continuity of carer. Private obstetrician care is faster but costs more. Public antenatal clinics are free but you may see different staff each visit.
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