# Chinese Gender Predictor — Baby Gender Chart > Predict boy or girl with the ancient Chinese gender chart from the mother’s lunar age and lunar conception month. Just for fun — ~50% accuracy, no science. - **Category:** Unique & Playful - **Interactive calculator:** https://youcalc.com/en/unique-playful/chinese-gender-predictor/ - **Price:** Free, no sign-up required ## Overview The Chinese gender predictor is a centuries-old piece of folklore that guesses whether a baby will be a boy or a girl from just two things: the mother's age and the time of conception. This tool takes the modern, accurate version of that legend — it converts the mother's birth date into her nominal Chinese (lunar) age and the conception date into a Chinese lunar month, then reads the answer off the traditional 18-to-45 by 1-to-12 chart and highlights your cell on the full interactive grid. It is built to be fun and shareable, nothing more. There is no scientific basis for the chart and its accuracy is about 50% — the same as flipping a coin — so it is not medical advice and must never be used to try to choose a baby's sex. ## How to read your result Enter the mother's birth date and the (approximate) date of conception. The readout shows the two numbers the chart actually uses: her lunar age and the lunar conception month. The big callout then shows the chart's guess — "Boy" or "Girl" — and the heatmap below highlights exactly which cell that came from, with blue cells for boy and pink cells for girl across the whole chart. If your dates fall outside the chart's range (a lunar age under 18 or over 45) there is no cell to read, and the tool says so instead of guessing. Remember the headline is entertainment: a 50/50 chart will look impressively "right" about half the time by pure chance. ## Method The mother's birth date and the conception date are each converted from the Gregorian calendar into the Chinese calendar. The mother's nominal Chinese age is the difference in Chinese calendar years between the two dates plus one (you are counted as one year old at birth), giving a value from 18 to 45 for the chart. The conception date's Chinese lunar month, 1 to 12, is read directly from the Chinese calendar; if it falls in a leap month, its base month number is used. The pair (lunar age, lunar month) indexes a fixed lookup table — the canonical 28-row by 12-column chart, locked against multiple independent published chart images that agree (anchor cell: lunar age 27 by lunar month 7 = Boy) — which returns Boy or Girl. The widely shared "cardinal-number" shortcut (49 + month − age) does not reproduce this chart and is deliberately not used. The function is pure: it takes the two dates as inputs and never reads the system clock, so the same dates always give the same answer. None of this has any biological meaning; the chart is entertainment with roughly coin-flip accuracy. ## Example - **Setup:** Mother born 15 June 1990; baby conceived around 15 August 2016. - **Result:** Her nominal Chinese (lunar) age at conception works out to 27, and 15 August 2016 falls in the 7th Chinese lunar month. The chart cell at lunar age 27 and lunar month 7 reads "Boy," so the predictor guesses boy — for fun only. ## Frequently asked questions ### Is the Chinese gender predictor accurate? No. It is folklore with no scientific basis. Independent studies have found its accuracy is around 50% — statistically the same as flipping a coin. Use it for fun only, never as a real indication of your baby's sex or as a substitute for an ultrasound or a doctor. ### What age and month does the chart actually use? It uses the mother's nominal Chinese age — a system where you are one year old at birth and gain a year at each Chinese New Year, so it is usually one to two years higher than your everyday age — measured at the time of conception, together with the Chinese lunar month the conception fell in. This tool converts your Gregorian dates into both for you. ### Why does it sometimes say my dates are outside the chart? The traditional chart only covers a mother's lunar age of 18 to 45. If the computed lunar age comes out below 18 or above 45, there is no cell to read and the tool tells you rather than inventing an answer. Check that the mother's birth date and the conception date are both correct. ### Can I use this to choose or guarantee my baby's gender? No. The chart has no predictive or causal power whatsoever — it cannot influence or reliably foretell a baby's sex. It must never be used for sex selection, and nothing here is medical advice. ### Why isn't the result just based on my normal age and the calendar month? Because the chart is defined against the Chinese lunar calendar, not the Western one. Both the mother's nominal Chinese age and the lunar month drift relative to the Gregorian calendar, so using your everyday age or the Gregorian month would read the wrong cell. The conversion is what makes this version match the canonical chart. ## Related calculators - [Pregnancy Due Date Calculator](https://youcalc.com/en/health-body/pregnancy-due-date/) - [Ovulation Calculator](https://youcalc.com/en/health-body/ovulation/) - [Hijri Age Calculator](https://youcalc.com/en/date-time/multi-calendar-age/) ## Sources - https://chinesegendercalendar.org/chinese-gender-calendar-chart - https://www.travelchinaguide.com/intro/chinese-gender-calendar.htm - https://www.prokerala.com/kids/baby-gender/chinese-birth-chart.php --- Interactive version: https://youcalc.com/en/unique-playful/chinese-gender-predictor/ · From YouCalc — https://youcalc.com