Health category
Fitness, nutrition, pregnancy, sleep, and wellness calculators.
Pregnancy Due Date Calculator
Estimate your due date, see how many weeks pregnant you are, and track trimester milestones using your LMP, conception date, or IVF transfer date.
This is the most common way to estimate a due date for naturally conceived pregnancies.
Estimated due date
December 22, 2026
Current pregnancy week
12w 0d
Trimester
First trimester
Estimated conception date
March 31, 2026
End of first trimester
June 22, 2026
End of second trimester
September 28, 2026
Viability milestone (24 weeks)
September 1, 2026
Full term (37 weeks)
December 1, 2026
Pregnancy progress
30.0% complete
28 weeks until the 40-week mark
Week-by-week timeline
See how far along the pregnancy is and when each week begins.
Week 0
Starts Mar 17
Week 1
Starts Mar 24
Week 2
Starts Mar 31
Week 3
Starts Apr 7
Week 4
Starts Apr 14
Week 5
Starts Apr 21
Week 6
Starts Apr 28
Week 7
Starts May 5
Week 8
Starts May 12
Week 9
Starts May 19
Week 10
Starts May 26
Week 11
Starts Jun 2
Week 12
Starts Jun 9
Week 13
Starts Jun 16
Week 14
Starts Jun 23
Week 15
Starts Jun 30
Week 16
Starts Jul 7
Week 17
Starts Jul 14
Week 18
Starts Jul 21
Week 19
Starts Jul 28
Week 20
Starts Aug 4
Week 21
Starts Aug 11
Week 22
Starts Aug 18
Week 23
Starts Aug 25
Week 24
Starts Sep 1
Week 25
Starts Sep 8
Week 26
Starts Sep 15
Week 27
Starts Sep 22
Week 28
Starts Sep 29
Week 29
Starts Oct 6
Week 30
Starts Oct 13
Week 31
Starts Oct 20
Week 32
Starts Oct 27
Week 33
Starts Nov 3
Week 34
Starts Nov 10
Week 35
Starts Nov 17
Week 36
Starts Nov 24
Week 37
Starts Dec 1
Week 38
Starts Dec 8
Week 39
Starts Dec 15
Week 40
Starts Dec 22
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This Pregnancy Due Date Calculator is built to give a quick, browser-based estimate for pregnancy due date. Estimate your due date, see how many weeks pregnant you are, and track trimester milestones using your LMP, conception date, or IVF transfer date. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For health tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the pregnancy due date result
Best use
Use the result as an informational wellness estimate that can help organize measurements, targets, or timing before a conversation with a clinician.
Cross-check
Compare the output with your own records, device readings, lab values, medication instructions, or guidance from a qualified health professional.
Watch for
Do not use this page to diagnose, treat, or ignore symptoms. Health calculators are most useful when they make questions clearer, not when they replace care.
This page belongs to the Health calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this pregnancy due date estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Use current measurements
Recent weight, height, age, activity, nutrition, sleep, or timing inputs matter more than remembered estimates.
Look for context
A calculator can organize a wellness number, but it cannot read symptoms, medical history, medications, or lab results.
Escalate high-impact questions
Use clinical guidance for pregnancy, dosage, heart, risk, illness, or treatment decisions.
Rerun this page when measurements change, a clinician gives new guidance, or the result is being used for a new goal.
How to Use
- Choose whether you want to calculate from your last menstrual period, conception date, or IVF transfer date.
- Enter the relevant date, and if you choose IVF, select whether the embryo was transferred on day 3 or day 5.
- Review your estimated due date, current pregnancy week, trimester, and conception estimate.
- Use the milestone cards and week-by-week timeline to see important dates during the pregnancy.
Frequently Asked Questions
How is a pregnancy due date calculated from the last menstrual period?
A standard pregnancy due date is typically estimated as 280 days, or 40 weeks, from the first day of your last menstrual period. This assumes ovulation and conception happened about 14 days later.
Is the due date exact?
No. A due date is an estimate, not a guarantee. Most babies are born within a range around the estimated due date, and only a small percentage arrive on that exact day.
Why does conception dating differ from pregnancy weeks?
Pregnancy weeks are usually counted from the last menstrual period, which is about two weeks before conception in a typical cycle. That is why gestational age is usually about two weeks ahead of fetal age.
Are IVF due dates more accurate?
IVF dating is often more precise because the transfer date and embryo age are known. The calculation adjusts for whether a 3-day or 5-day embryo was transferred.
Can an ultrasound change my due date?
Yes. A healthcare provider may update your estimated due date based on early ultrasound measurements, especially if they differ meaningfully from LMP dating.
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