BiteCheck calculators
Pregnancy Calculator
Estimate your due date, trimester ranges, and pregnancy milestones using LMP, conception, or ultrasound information.
Select your dating method
Start with the first day of your last period or switch to conception or ultrasound if you know those dates.
How to read your pregnancy timeline
Most providers date pregnancy from the first day of the last menstrual period (LMP). The calculator mirrors that approach, then adjusts based on your average cycle length so your estimated due date better reflects when you typically ovulate. If you know your conception or ultrasound date, switch methods to align the timeline with clinical milestones like early scans.
What your results include
- Estimated due date: Calculated at 40 weeks (280 days) from LMP with a cycle length adjustment.
- Gestational age today: The number of weeks and days from your LMP to today.
- Trimester boundaries: Approximate start and end dates for first, second, and third trimester.
- Key milestones: Common checkpoints like heartbeat detection and the anatomy scan window.
Planning tips
Use the timeline to schedule prenatal visits, plan travel, and map out questions for your care team. The dates are estimates—your clinician may adjust them based on ultrasound measurements or other medical factors. If your cycles are irregular, consider relying on ultrasound dating for the most accurate view.
Frequently asked questions
How does the pregnancy calculator estimate the due date?
The calculator uses your last menstrual period (LMP), conception date, or ultrasound date to estimate gestational age and then projects a due date at 40 weeks (280 days).
Why does cycle length matter?
Longer or shorter cycles shift ovulation timing. Adjusting for your average cycle length helps align the due date with your typical ovulation window.
Is this the same as a medical due date?
No. This tool provides an estimate for planning and education. Your clinician may update your due date based on ultrasound measurements and medical history.
What counts as full term?
Full term is generally considered 39 to 40 weeks of pregnancy, though delivery can safely occur earlier or later with medical guidance.
Can I use this if I know the conception date?
Yes. Select the conception option to estimate your LMP, due date, and milestones based on when conception occurred.
How accurate are milestone dates?
Milestones are approximate. Fetal development varies, so use these dates as helpful reference points rather than exact deadlines.
Informational only, not medical advice. Consult a healthcare professional for personalized guidance.
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