About DueDateCalculator.com
Free, medically reviewed pregnancy due date tools — built for every expecting parent, breeder, and pet owner.
Our Mission
At DueDateCalculator.com, we believe every expecting parent deserves access to clear, accurate, and free pregnancy tools — no paywalls, no accounts, no clutter standing between you and an answer. A due date is one of the first milestones of a pregnancy journey, and the math behind it should be transparent, honest, and easy to understand.
Our calculators use the same medically validated formulas that OB-GYNs and midwives rely on every day: Naegele's Rule from your last menstrual period, IVF embryo transfer dating, ultrasound dating, and conception-based calculations.
We also cover animal pregnancies — because farmers, breeders, and pet owners deserve the same quality of information as human parents. From dog and cat gestation to horse, cattle, and goat due dates, every animal calculator uses veterinary-standard gestation lengths.
Why You Can Trust Our Tools
A licensed OB/GYN or veterinarian reviews every page before publication.
We follow ACOG, WHO, and ASRM guidance — not guesswork.
Calculations run entirely in your browser. We never store your dates.
We tell you when a result is an estimate and when to ask your provider.
Content is re-reviewed when medical guidelines change.
Every calculator and article is free. No accounts, no paywalls.
Why Free — and How We Stay That Way
Pregnancy information should not sit behind a paywall. We keep every calculator and article free by showing a small number of ads on the site — never pop-ups that block your result, never sponsored content disguised as medical guidance. Advertising keeps the lights on; it never influences what we write. Our reviewers do not see our ad partners, and our ad partners do not see our content before it is published.
We also keep the site fast and private: no accounts to create, no newsletters you must join, and no health data leaving your browser. What you type into a calculator stays on your device. Read our privacy policy for the full picture.
Our Team
Our content is written by a trained health writer and medically reviewed by licensed clinicians before it is published. Each profile below is text-based and transparent about each person’s role in our editorial process.
Ashok researches and writes every pregnancy article and calculator page using peer-reviewed sources and clinical guidelines.
View profile →Dr. Basnet is a licensed obstetrician-gynecologist who reviews all human pregnancy content for clinical accuracy.
View profile →Dr. Yadav holds a Doctor of Veterinary Medicine degree and reviews all animal pregnancy calculator content.
View profile →What We Cover
From your first positive test to delivery day, our tools walk with you through the pregnancy timeline — and we publish in-depth guides explaining the science behind every number.
Editorial Standards
Every page on DueDateCalculator.com is researched using peer-reviewed journals and clinical guidelines from ACOG, WHO, and ASRM, alongside established veterinary sources such as the AVMA for animal content. Medical claims are reviewed by a licensed clinician before publication, and we update content whenever guidelines change. If we make a mistake, we fix it publicly — see our correction policy in our review process.
Our tools are for educational purposes and do not replace professional medical advice. Always confirm your due date with your healthcare provider. Read the medical disclaimer.