Chinese Calendar When to Conceive: What the Chart Says (2026)

No. People search for "when to conceive" with the chart because the idea looks simple: if the chart says a mother of a certain lunar age gets a boy in lunar month 3, then conceiving in month 3 should give a boy. The logic only works if the chart predicts anything, and it does not.

The chart was tested on 2,840,755 singleton births in Sweden from 1973 to 2006. Villamor and colleagues estimated each mother's lunar age and lunar month of conception, read the chart, and compared it with the baby's actual sex. Agreement was at chance level (kappa 0.0002), and it did not change with the mother's age, the year of conception or the number of earlier children. Their conclusion, published in 2010 in Paediatric and Perinatal Epidemiology: the method is "no better at predicting the sex of a baby than tossing a coin." If the chart cannot predict the sex of babies already conceived, timing a conception around it cannot work either.

The reason is biology. The egg always carries an X chromosome. Each sperm carries either an X (girl) or a Y (boy), and which one reaches the egg first is not linked to the lunar month or to the mother's age. Our guide on who determines the sex of the baby explains this in more detail.

What the chart does offer is a piece of culture. Popular legend says it was found in a royal tomb near Beijing about 700 years ago; no historical record confirms the story. Today it is shared at baby showers and on parenting forums as a guessing game. The rest of this page shows you exactly what it says, so you can read it correctly if you are curious.

Reading the chart takes three steps. Most mistakes happen in the first one.

1. Work out your lunar age on the date in question. In the traditional Chinese system you are 1 at birth, and you gain a year at every Chinese New Year rather than on your birthday, so your lunar age is usually one or two years above your everyday age. Our lunar age calculator shows it for any date.
2. Find the lunar month. Lunar months do not line up with January to December. In 2026, lunar month 1 starts on Feb 17, 2026, so a date in early March is still lunar month 1. The date table further down gives every month.
3. Read the cell where your lunar-age row meets that month's column on the full Chinese gender chart. The table below lists the same cells by row.

If you are already pregnant, our Chinese gender calendar calculator does all three steps from your birthday and conception date, and shows the lunar age and lunar month it used.

The Chinese lunar year 2026 (Year of the Horse) begins on Feb 17, 2026. Each lunar month starts on a new moon and lasts 29 or 30 days. 2026 has no leap month, so the months run 1 to 12 without a repeat. (2025 had a leap sixth month, and 2028 has a leap fifth month.)

These are the exact dates from the Hong Kong Observatory's conversion tables, the same dates our calculator uses.

Lunar months 11 and 12 of the 2026 lunar year run into January and early February 2027, ending on Feb 5, 2027. The 2027 lunar year starts the next day, at Chinese New Year on Feb 6, 2027, and every mother's lunar age goes up by one that day. So a date in January 2027 is read with your 2026 lunar age, and a date on or after Feb 6, 2027 with your new one.

The 2027 Chinese gender calendar lists every 2027 lunar month, and the 2026 to 2027 guide walks through dates near the changeover.

A baby's biological sex is decided at fertilization. If the sperm that fertilizes the egg carries a Y chromosome, the baby is genetically male; if it carries an X, female. The SRY gene on the Y chromosome then starts male development. None of this depends on the calendar month or on the mother's age, which is why the chart's labels match real births only by chance.

The chart's labels also look patterned, and that makes them feel meaningful. Some rows are almost all one label (lunar age 30 is girl for months 2 to 10), and others alternate. That pattern is part of the folklore grid, not something measured in real births.

For anyone already pregnant, the sex can be found out medically: an ultrasound scan in the second trimester, or a prenatal blood test that looks at the baby's DNA in the mother's blood. Our page on when you can find out the gender of a baby describes when these are usually offered. For a full look at the research on the chart, see our accuracy analysis.