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Chinese gender predictor

Converts the mother's age and conception month to the Chinese calendar and reads the Chinese gender chart. Just for fun.

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Not sure? Use your ovulation date, or the first day of your last period plus 14 days.

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How to use

  1. Enter the mother’s date of birth.
  2. Choose “Conception date” if you know it (your ovulation date is a good estimate), or “Due date” to estimate conception as 266 days before it.
  3. You get the chart’s answer, the mother’s lunar age at conception and the lunar date of conception, plus all 12 months of the chart for that age.

How it works

The chart needs two numbers:

  • The mother’s lunar age at conception = lunar year of conception − lunar year of birth + 1. Lunar years start at Chinese New Year (late January to mid-February), so birthdays and conception dates early in the year often belong to the previous lunar year.
  • The lunar month of conception: the conception date converted to the Chinese calendar.

Dates are converted with the Hong Kong Observatory tables for 1901 to 2100 — the same data as our Chinese lunar calendar converter. The cell where the age and month meet is the prediction.

The chart itself was compared across three published versions (immihelp.com, k366.com and astrogle.com); where they disagree, the majority answer is used.

Examples

Mother born Conceived Lunar age and month Chart says
08/11/1994 20/05/2026 Age 33, month 4 (Day 4) Boy
02/04/1996 10/09/2026 Age 31, month 7 (Day 29) Girl
02/04/1996 15/01/2027 Age 31, month 12 of lunar 2026 Boy

In the first row the mother is 31 in ordinary years but 33 by lunar age. In the last row, 15 January 2027 still belongs to lunar year 2026, because the Year of the Goat doesn’t start until 6 February 2027.

Please treat the answer as entertainment only. Only a scan or a medical test can tell you the sex of your baby.

The full Chinese gender chart

Rows are the mother's lunar age at conception; columns are the lunar month of conception (1 = first lunar month). Cells marked * differ between published versions; the majority answer is shown.

Age 123456789101112
18 GBGBBBBBBBBB
19 BGBGGBBBBBGG
20 GBGBBBBBBG*BB
21 BGGGGGGGGGGG
22 GBBGBGGBGGGG
23 BBGBBGBGBBBG
24 BGBBGBBGGGGG
25 GBBGGBGBBBBB
26 BGBGGBGBGGGG
27 GBGBGGBBBBGB
28 BGBGGGBBBBGG
29 GBGGBBBBBGGG
30 BGGGGGGGGGBB
31 BGBGGGGGGGGB
32 BGBGGGGGGGGB
33 GBG*BGGGBGGGB
34 BGBGGG*GGGGBB
35 BBGBGGGBGGBB
36 GBBGBGGGBBBB
37 BGBBGBGBGBGB
38 GBGBBGBGBGBG
39 BGBBBGGBGBGG
40 GBGBGBBGBGBG
41 BGBGBGBBGBGB
42 GBGBGBGBBGBG
43 BGBGBGBGB*B*B*B*
44 BBGBBBGBGBGG
45 GBBGGGBGBGBB

FAQ

How accurate is the Chinese gender chart?

About as accurate as tossing a coin. Researchers checked it against 2.8 million births in Sweden from 1973 to 2006 and found it right about 50% of the time (Villamor et al., Paediatric and Perinatal Epidemiology, 2010). A baby's sex is set at fertilisation by whether the sperm carries an X or a Y chromosome; the mother's age and the month have nothing to do with it. Treat it like any other old wives' tale.

Will the NHS tell me the sex at my 20-week scan?

Possibly, but it isn't guaranteed. The NHS says finding out the sex is not part of the national screening programme, so whether you can be told at the 20-week (anomaly) scan depends on your hospital's policy, and some hospitals have a policy of not telling. If you'd like to know, tell the sonographer at the start of the scan. Even then they can't be 100% certain, and if the baby is lying awkwardly it may be impossible to tell.

What is lunar age?

The traditional Chinese way of counting age. You are 1 at birth and gain a year every Chinese New Year, so your lunar age is usually one or two years more than your age in years. The calculator works it out as the lunar year of conception minus the lunar year of the mother's birth, plus one.

Should I use the date of conception or of my last period?

Most versions of the chart use the lunar month of conception, and so does this calculator. If you only know the due date from your dating scan, choose "Due date" and the calculator estimates conception as 266 days earlier. Our due date calculator can work out the due date from your last period first.

Why do different websites give different answers?

The chart has no documented original, and copies online differ in a few cells. We compared three published versions and found seven cells that disagree (ages 20 in month 10, 33 in month 3, 34 in month 6, and 43 in months 9 to 12). This calculator uses the majority answer and marks those cells with *. Sites also differ in how they convert age and month to the Chinese calendar — some skip the conversion entirely — which changes the result for a lot of people.

Sources

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