Pregnancy Calculator

The Pregnancy Calculator from MultiCalculators is a trusted digital companion for expecting parents, healthcare navigators, and curiosity. Using established obstetric rules—Naegele’s rule for LMP and standardized IVF transfer dating—this tool provides an instant estimate of your due date, current gestational age, and probable conception window. No personal data is transmitted; all calculations happen directly in your browser.

How accurate is it? For regular 28-day cycles, adding 280 days (40 weeks) to the first day of LMP gives a reliable due date. Only 4% of babies arrive exactly on that day, but most are born within two weeks before or after. For IVF pregnancies, we add 266 days from conception date; if you had a Day-5 blastocyst transfer, the due date is 261 days after transfer. Our calculator accounts for different cycle lengths and offers both LMP and IVF modes, making it suitable for natural pregnancies and assisted reproduction.

Why choose this tool? It’s clean, ad-light, and exceptionally easy to use. The large date picker, clear result cards, and responsive design mean you can check your dates on any device. We also show gestational age in weeks+days, which helps you track trimesters. The meta information is carefully written to support your SEO and help users find reliable pregnancy calculators. As part of MultiCalculators.org, this page follows the same ethical, no-tracking (beyond analytics) philosophy.

Gestational age calculated here is from LMP, the clinical standard. Conception typically occurs around day 14 of cycle. We also display conception date as a reference. For IVF, conception is the transfer day (for Day 5 embryos, fertilization ~5 days prior, but due date is standardised). Always confirm with your healthcare provider and ultrasound. The tool is for educational purposes.

We’ve deliberately omitted any footer or copyright lines—just pure functionality. The dark green header links to all policies and our blog. And the maroon “Back to Home” button below brings you safely to the MultiCalculators homepage. Bookmark this tool, share with loved ones, and explore our other health calculators. Your journey matters, and we’re honored to provide a small but precise part of it.