· 6 min read
How to Estimate Your Conception Date (for the Chinese Gender Predictor)
The chart needs the conception month, not the due date. Four ways to estimate it — from your last period, due date, ovulation or IVF transfer.
Read guide →Chinese gender calendar & predictor guides
Short, sourced explanations of how the chart works, how to get the inputs right, and what the evidence says about it.
· 5 min read
Is the Chinese Gender Calendar Accurate? What 2.8 Million Births Show
The largest test of the Chinese gender chart checked 2,840,755 Swedish births. What it measured, what it found, and why '93% accurate' claims fail.
Read guide →
· 5 min read
Why Each Chinese Gender Predictor Online Gives a Different Answer
We compared published Chinese gender charts cell by cell: three matched in all 336 cells, others differed in 80 or 144. Here's why results differ.
Read guide →
How the Chinese Gender Calendar Works, Step by Step
A plain explanation of the Chinese gender chart: lunar age rows, lunar month columns, why versions differ, and what the evidence says.
Read guide →
Leap Months and the Chinese Gender Calendar
What a lunar leap month is, how often it happens, and the single rule this site uses to read it on the chart — with the 2025 leap 6th month as an example.
Read guide →
Lunar Age (Xusui) Explained for the Chinese Gender Calendar
What lunar age is, how to calculate it from lunar years, and why it changes at Lunar New Year instead of your birthday or Lichun.
Read guide →