Astrology pregnancy “calculators”: what the evidence says
Popular, fun, and not a dating method. A respectful, evidence-based look at astrology-based pregnancy and gender predictors.
astrology pregnancy calculatorArticles on pregnancy dating
Plain-language explanations of how due dates and gestational age are calculated — the methods behind the wheel, how accurate they are, and the terminology you’ll meet along the way. Every article is reviewed against ACOG and NHS guidance and carries the same medical disclaimer.
Pregnancy calculators in other languages: does the maths change?
Malayalam, Hindi, English — the dating maths is identical everywhere. What actually differs is terminology and interface.
pregnancy calculator malayalamOB wheel app vs. online calculator: which should you use?
Download an app, or just open a web page? A practical comparison of speed, privacy, and accuracy for pregnancy dating.
ob wheel appPregnancy trimesters and key milestones, week by week
A clean map of the pregnancy timeline — trimester boundaries, viability at 24 weeks, and what “term” really means.
pregnancy trimesters and milestonesPeriod of gestation (POG): what it means and how to calculate it
“POG” on a chart just means how far along the pregnancy is. What the term means, how it's written, and how to work it out.
pog calculator appConception date and due date: what you can and can't know
If you know the day you conceived, the due date is 266 days later. But how well can anyone actually know that day?
conception date calculatorIVF due date calculation: day-3 vs day-5 transfers
IVF dating is the most precise there is, because the timing is known to the day. How transfers and retrieval convert to a due date.
ivf due date calculatorHow accurate is your due date, really?
Few babies arrive on the exact date. What the estimate really means, why methods disagree, and when the scan should win.
due date accuracyGestational age vs. fetal age: what's the difference?
Why “how many weeks pregnant” is counted from your last period, not from conception — and the two-week gap that confuses everyone.
gestational age vs fetal ageCrown-rump length (CRL) and first-trimester ultrasound dating
Why the first-trimester scan is the gold standard for dating, how crown-rump length becomes a due date, and when it overrides the last period.
crown rump length calculatorNaegele's rule: calculating a due date from your last period
The 280-day rule behind every pregnancy wheel — where it comes from, how cycle length changes it, and when to trust a scan instead.
ob wheel pregnancyHow to read a pregnancy wheel (the circle chart), step by step
Line up one date, read off the rest. A plain-language walkthrough of the pregnancy circle chart and the mistakes to avoid.
pregnancy circle chartWhat is an OB wheel, and how do clinicians use it?
The pregnancy dating wheel that clinicians spin between patients — what it is, how it works, and what an online version does better.
ob wheel