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

Pregnancy Due Date Calculator

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

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Canadian moms often The due date is the anchor for Employment Insurance maternity leave planning, your provincial health card appointments, and birth registration. This calculator uses Naegele rule (LMP plus 280 days) which is what your family doctor or OB will use. We show the dating scan window, EI leave calculation triggers, and provincial midwifery program timing where applicable.

📅 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 Canada

How pregnancy due date estimation care actually works in Canada

Canadian pediatric care runs through provincial public health. Your health card covers everything: ER visits, family doctor appointments, walk in clinics. OHIP in Ontario. RAMQ in Quebec. MSP in British Columbia. Each province slightly different but the principle is the same. Pediatric specialty hospitals serve as referral centres. SickKids in Toronto. BC Childrens in Vancouver. CHEO in Ottawa. Sainte Justine in Montreal. The 811 health line is your first call for after hours triage. Available in most provinces. Many Canadians do not have a family doctor right now (the shortage is real). Walk in clinics and Telus Health Virtual Care fill the gap. Wait times are the main frustration with the system.

📞 Emergency contacts in Canada

In Canada, call 811 for free 24/7 health advice (available in most provinces). For emergencies, call 911. Pediatric specialty hospitals (SickKids in Toronto, BC Children, CHEO in Ottawa, Sainte-Justine in Montreal) have specific after hours services. Your provincial health card covers all of this. Telus Health TM Virtual Care also provides pediatric consultations.

Context for Canadian families

What Canadian moms actually deal with

Canadian parents are generally pragmatic and reasonably trusting of the medical system. Wait times frustrate everyone. The family doctor shortage frustrates everyone more. Cultural norm is to call 811 first, then decide between walk in clinic, family doctor, or ER based on what they tell you. Winter respiratory illness season is brutal in Canada. November through March, intense circulation of RSV, flu, and COVID. Babies under 6 months are at highest risk for complications. The RSV prophylaxis program (nirsevimab, brand Beyfortus) is now standard. Free through provincial programs in most provinces. Ask your family doctor or call 811 to confirm eligibility for your baby.

More FAQs for Canada

Canadian-specific questions

Across Canada, Employment Insurance maternity benefits provide 15 weeks of payments and parental benefits add up to 35-61 more weeks. Your due date is the anchor for benefit start date planning. You can start maternity benefits as early as 12 weeks before your due date. Apply through Service Canada online. Quebec has its own program (QPIP) with different rules and generally more generous payouts.
Up north, your family doctor may handle the entire low-risk pregnancy themselves, refer you to an obstetrician for higher-risk cases, or refer you to a registered midwife if available in your province. Midwifery is funded provincially in most provinces (Ontario, BC, Quebec, Alberta, Manitoba, Saskatchewan, NWT). Your due date triggers the referral conversation.
Many Canadians lack a family doctor due to ongoing shortages. For pregnancy, you can self-refer to a midwifery clinic where available, or walk-in clinics can refer you to an OB. Some provinces have rapid-access clinics for pregnant women without primary care. Call 811 for guidance specific to your province. Do not delay prenatal care due to lack of a family doctor.
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