Science-based pregnancy tools for due dates, weekly progress tracking, and prenatal planning. Reviewed against ACOG 2026 guidelines.
Whether you're newly pregnant trying to figure out your due date, mid-pregnancy tracking weekly milestones, or just curious about conception dates and trimester progress, our pregnancy calculators give you accurate, evidence-based answers — all free, no signup, and your data never leaves your browser.
Knowing your due date is the foundation of pregnancy planning. Every prenatal appointment, test, and milestone is scheduled relative to it — from your first ultrasound at 8-13 weeks to the glucose challenge at 24-28 weeks to the GBS test at 35-37 weeks. A reliable pregnancy calculator gives you this anchor immediately, before your first doctor's visit can confirm it.
Beyond the due date itself, our calculator shows you where you are right now — which trimester, which week, how far along, and how much time remains. It also generates the appointment schedule your provider would normally hand you in printed form, so you can plan ahead and never miss a critical test window.
| Stage | Weeks | Key Developments |
|---|---|---|
| 1st Trimester | 1-13 | Implantation, organ formation, heartbeat begins |
| 2nd Trimester | 14-27 | Anatomy scan, gender visible, first movements felt |
| 3rd Trimester | 28-40 | Rapid growth, lung development, delivery prep |
| Early Term | 37-38+6 | Baby considered ready but earlier than optimal |
| Full Term | 39-40+6 | Optimal delivery window for best outcomes |
| Late Term | 41-41+6 | Additional monitoring typically begins |
| Post-Term | 42+ | Induction usually recommended |
For detailed calculations and a personalized timeline, use our Pregnancy Due Date Calculator.
Yes, completely free. No signup, no email required. All calculations happen in your browser, and no personal data is stored or transmitted.
No. Our calculators provide educational estimates based on standard medical formulas. Your healthcare provider will confirm your due date with an early ultrasound and provide personalized guidance throughout your pregnancy. Always follow your provider's specific recommendations.
The math is exact, but the prediction is an estimate. Only about 4% of babies are born on their exact due date — most arrive within 1-2 weeks of it. Early ultrasound dating (8-13 weeks) is more accurate than LMP-based calculations.
Yes. We're planning conception date calculator, ovulation calculator, pregnancy weight gain calculator, and a fertility window calculator. Bookmark this page or check back regularly.
Get your personalized due date with full pregnancy timeline in under a minute. Free and instant.
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