A Due Date Calculator for the
midwife
Due Date Cal started with a simple goal. We wanted to give expecting parents a fast, free, and accurate way to estimate a due date. Most calculators online just spit out a number. We wanted ours to also explain where that number comes from, so you can trust it and understand it.
How We Build Our Calculators
Every calculator on this site runs entirely in your browser. Your dates never get sent to a server, logged, or stored anywhere. We built it this way on purpose. A due date calculator handles personal information, and we think the safest data is data we never collect in the first place.
We also test our date math carefully. Before we publish any calculator, we check it against known, verified dates. If a calculation involves a specific clinical formula, like IVF transfer dating or ACOG’s redating thresholds, we source it from the original guideline rather than guessing.
Our Mission
We believe pregnancy information should be free, fast, and honest. Our due date calculator runs the same formula doctors use, called Naegele’s rule. We also built tools for conception dating and IVF dating, since one formula doesn’t fit every pregnancy. Beyond the calculators, we write plain-English articles that explain the medical reasoning behind the numbers. We want you to leave duedatecal.com understanding your due date, not just holding one.
What You’ll Find Here
Due Date Calculator
Estimate your baby’s due date from your last period, a known conception date, or an IVF transfer date.
Ovulation Calendar
Estimate your ovulation day and fertile window from your last period and average cycle length.
Pregnancy Questions Centre
Search for your question; all topics are here with one click. Helpful information for your most requested questions.
Baby name generator helps you to search baby boy and baby girl names to find their origin and meaning. Enter a name you have in your mind.
Our Editorial Standards
duedatecal.com offers free calculators for your due date, ovulation window, and everyday date math, along with pregnancy dating articles sourced from ACOG, the NHS, and the Mayo Clinic. Every calculator runs in your browser, so your dates are never saved or shared. We provide general information only, not medical advice.
We also avoid a few things on purpose. Don’t publish invented statistics. And we don’t give personal medical advice, dosing information, or induction advice — that’s your provider’s job, not ours. And we clearly mark every estimate as an estimate, because a due date is a starting point, not a guarantee.
Get in Touch
Found an error, or have a question we didn’t answer? Visit our contact page. We read every message, and update our articles when new guidance changes.
A Note to the Reader
This article gives general information only. It isn’t a substitute for advice from a midwife, doctor, or other qualified healthcare provider about your specific pregnancy.