About Pregora

We build tools that help expecting parents answer the most common questions of pregnancy quickly and accurately. Our pregnancy due date calculator estimates when your baby is likely to arrive based on your last menstrual period, conception date, ultrasound dating, or known due date. Our IVF due date calculator handles the specialized math for Day 3, Day 5, Day 6 embryo transfers, plus fresh and frozen (FET) cycles. Our pregnancy weight gain calculator uses Institute of Medicine guidelines to find your healthy gain range based on pre-pregnancy BMI. And we are continuously adding new pregnancy tools, baby calculators, and educational guides to cover every stage from conception through the first year of life.

Pregnancy is a Your-Money-Your-Life (YMYL) topic, which means we take accuracy and trust seriously. Every calculator and pregnancy guide on Pregora is built from peer-reviewed research or official guidelines published by recognized medical organisations. Our primary sources include:

• •Institute of Medicine (IOM) — pregnancy weight gain guidelines (2009, current standard endorsed by ACOG)
• •American College of Obstetricians and Gynecologists (ACOG) — Committee Opinion #700 (due date estimation), #548 (weight gain), and current practice bulletins
• •World Health Organization (WHO) — child growth standards for baby percentile calculators
• •Centers for Disease Control (CDC) — growth charts for children over 2 years
• •NHS, NICHD, and ASRM — for fertility, IVF, and prenatal care references

Every tool page on Pregora cites the specific sources used, with direct links to the original publications so readers can verify the evidence behind each calculation.

Pregnancy data is deeply personal. That is why every calculator on Pregora runs entirely in your browser — your last menstrual period date, weight, height, ultrasound measurements, and any other input you provide never leave your device. We do not store inputs, share them with third parties, or use them for tracking. We do not require an account, an email address, or any form of registration to use any tool on this site. Read our full privacy policy for details on cookies, analytics, and third-party advertising.

Most pregnancy calculator websites are media properties that bury tools under heavy ads, intrusive popups, and email signup walls. Many were built a decade ago and have not been updated. Some cover only the most basic version of each tool — a single generic IVF calculator instead of separate Day 3, Day 5, Day 6, and FET calculators that fertility clinics actually use.

Pregora was built differently. Every tool loads in under one second on mobile. Every calculation page is mobile-first (because over 70% of pregnancy searches happen on a phone). Every tool answers a specific scenario rather than a generic one. And every page is free of email walls, intrusive pop-ups, and subscription friction. Open the tool. Get your answer. Move on.

Medical guidelines evolve, and we update our calculators when they do. Each tool page displays a "last updated" date so you always know how current the underlying methodology is. If you spot a calculation error, an outdated reference, or a typo, please tell us — we take all corrections seriously and respond to every report.