About DueDateCalculator.com
Free 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
Every page is researched from peer-reviewed studies and clinical guidelines 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 updated 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, 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 Author
Every article and calculator page on DueDateCalculator.com is researched and written by one author, so the standards stay consistent from page to page.
Ashok researches and writes every pregnancy article and calculator page using peer-reviewed sources and clinical guidelines.
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. We update content whenever guidelines change, and if we make a mistake, we fix it.
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.