Free & instant · 2026

What will your baby be?

Nine prediction methods combined into one answer — from the Chinese calendar to your own gut feeling. No signup, just results.

By the Gender Predictor editorial team · Updated

Mother's birthday — used to calculate lunar age
Baby's expected arrival — we estimate conception from this
Some studies suggest a mother's gut feeling is right around 70% of the time.
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Lunar age × conception month

Your birth date and due date (or conception date) are converted to the Chinese lunar calendar automatically.

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A 700-year-old folk tradition

The chart is not scientifically proven — it is about 50% accurate, the same as a coin flip.

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9 methods, one vote

Chinese calendar, Ramzi, nub, heart rate, old wives' tales quiz, baking soda, skull, ring test and your gut feeling.

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Only medical answers count

For certainty, NIPT from 10 weeks (99%+) or the 18–20 week scan. Everything here is for entertainment.

Getting Started

How to Use the Gender Predictor

Three easy steps to get your baby gender prediction.

1

Enter Your Dates

Your birth date and due date are all you need. The tool calculates your lunar age at conception automatically.

2

Add Optional Methods

Include heart rate, baking soda test results, skull shape observations, or ring test outcomes for a stronger prediction.

3

Get Your Result

Click predict. See which gender all 9 methods vote for, with a confidence score and breakdown of each method.

The full Chinese gender chart

Based on the ancient Chinese lunar pregnancy calendar. Cross-reference your lunar age at conception with the lunar month.

Age123456789101112
18GirlBoyGirlBoyBoyBoyBoyBoyBoyBoyBoyBoy
19BoyGirlBoyBoyBoyBoyBoyBoyBoyBoyGirlGirl
20GirlBoyGirlBoyBoyBoyBoyBoyGirlBoyBoyBoy
21BoyBoyGirlGirlBoyBoyGirlBoyBoyGirlBoyGirl
22GirlBoyGirlGirlGirlBoyGirlBoyBoyGirlBoyGirl
23GirlGirlBoyBoyBoyGirlBoyBoyGirlBoyBoyBoy
24BoyGirlBoyBoyGirlBoyGirlGirlGirlGirlBoyBoy
25BoyGirlGirlBoyGirlBoyBoyGirlGirlGirlBoyBoy
26GirlBoyGirlBoyGirlGirlGirlGirlBoyBoyBoyBoy
27BoyGirlBoyGirlGirlGirlGirlBoyBoyBoyBoyBoy
28GirlBoyBoyGirlGirlGirlBoyBoyBoyBoyBoyBoy
29BoyBoyGirlGirlGirlGirlBoyBoyBoyBoyBoyBoy
30GirlBoyGirlGirlBoyGirlBoyBoyBoyBoyBoyBoy
31BoyGirlBoyBoyGirlBoyGirlBoyBoyBoyBoyBoy
32GirlBoyBoyBoyGirlBoyBoyGirlBoyBoyBoyBoy
33BoyGirlBoyBoyGirlGirlBoyBoyBoyBoyBoyBoy
34GirlBoyBoyBoyGirlGirlGirlBoyBoyBoyBoyBoy
35BoyBoyBoyBoyGirlGirlGirlBoyBoyBoyBoyBoy
36GirlBoyBoyGirlGirlGirlBoyBoyBoyBoyBoyBoy
37BoyBoyGirlGirlGirlGirlBoyBoyBoyBoyBoyBoy
38GirlBoyBoyGirlGirlGirlBoyBoyBoyBoyBoyBoy
39BoyBoyGirlGirlGirlGirlBoyBoyBoyBoyBoyBoy
40GirlBoyBoyGirlGirlGirlBoyBoyBoyBoyBoyBoy
41BoyGirlGirlGirlGirlGirlBoyBoyBoyBoyBoyBoy
42GirlBoyBoyGirlGirlGirlBoyBoyBoyBoyBoyBoy
43BoyBoyGirlGirlGirlGirlBoyBoyBoyBoyBoyBoy
44GirlBoyBoyGirlGirlGirlBoyBoyBoyBoyBoyBoy
45BoyBoyGirlGirlGirlGirlBoyBoyBoyBoyBoyBoy

How to read the Chinese gender chart

Find your lunar age at conception in the left column (Y axis), then move across to the month of conception (X axis). The cell where they meet is the prediction.

Boy Girl Lunar age (Y axis) Month of conception (X axis)

The story behind the chart

Legend says the original chart was kept inside the royal palace during the Qing dynasty (1644–1911) and only left it as the dynasty fell, eventually reaching the Beijing Institute of Science. It has loose connections to the I Ching, yin and yang, and the five elements. It relies on two simple principles: the mother's age at conception and the month of conception. No single official version exists — different sites circulate slightly different grids, so if two charts disagree, that's why. One more reason to treat it as a fun tradition rather than a medical test.

How lunar age works

In the Chinese system a baby is considered 1 year old at birth, because the time in the womb counts. Everyone then turns a year older at Chinese New Year rather than on their birthday — so lunar age is usually 1–2 years more than regular age. Example: if your age at conception is 28, your lunar age is 29. The chart itself is the same every year; only how your Gregorian dates convert to lunar months shifts because Lunar New Year falls on a different date each year — in 2026 it is February 17. Our tool adjusts for this automatically.

How accurate is the Chinese gender chart?

The chart claims 50 to 90 percent accuracy depending on the source. In reality, it has about a 50 percent chance of being right, which is the same as guessing. All prediction methods on this page are for entertainment purposes only.

Nine methods, one answer

Each method contributes to the combined prediction. Click any card to explore the science (and myth) behind it.

Which method is most accurate? Ramzi theory deep dive Nub theory at 12 weeks
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Chinese Calendar
Ancient lunar calendar, over 700 years old
Read the Chinese Calendar guide
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Ramzi Theory
Placenta position at 6-8 week scan
Read the Ramzi Theory guide
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Nub Theory
Angle of the genital tubercle
Read the Nub Theory guide
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Heart Rate
Baby's beats per minute
Read the Heart Rate guide
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Old Wives' Tales
15 classic signs and symptoms
Read the Old Wives' Tales guide
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Baking Soda Test
At-home fizzy science experiment
Read the Baking Soda Test guide
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Skull Theory
Skull shape at 12-week ultrasound
Read the Skull Theory guide
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Ring Test
Wedding ring pendulum swing
Read the Ring Test guide
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Gut Feeling
Your instinct, ~70% in studies
Read the Gut Feeling guide
Accuracy Data

How Accurate Is Each Method?

Not all prediction methods are equal. Here is what research and data actually show.

Method Claimed Accuracy Real Accuracy Scientific Evidence Best For
Chinese Calendar70-90%~50%NoneFun tradition
Ramzi Theory97%UnverifiedNot peer-reviewedEarly speculation
Nub Theory70-90%70-90%*Some informal dataBest non-medical method
Heart RateN/A~50%DisprovenNot useful
Old Wives TalesN/A~50%NoneBaby shower fun
Baking Soda TestN/A~50%NoneKitchen experiment
Skull Theory70-80%UnverifiedNoneSpeculation
Ring TestN/A~50%Ideomotor effectParty trick
NIPT Blood Test99%+99%+StrongMedical gold standard
20-Week Ultrasound95-99%95-99%StrongMost common method

* Nub theory accuracy depends on image quality, baby position, and reader experience. Not peer-reviewed. Medical methods (NIPT, ultrasound) are the only proven ways to determine gender.

Old wives' tales

The classic gender quiz

16 old wives' tales (plus your gut feeling), one answer. These have been passed down for generations. How many point the same way?

  1. How severe is your morning sickness? (Very severe / Mild or none)
  2. What are you craving most? (Sweet things / Salty or savory)
  3. How is your belly carrying? (High / Low)
  4. How has your skin changed? (Worse / breaking out / Better / glowing)
  5. Are your feet colder than usual? (Yes, much colder / No, about the same)
  6. How has your hair changed? (Thinner and dull / Thicker and shiny)
  7. How is your mood lately? (Moody and irritable / Calm and content)
  8. Is your baby's heart rate above 140 bpm? (Yes, above 140 / No, below 140)
  9. Has the dad gained weight too? (Yes, he has / No, not really)
  10. Which side do you prefer to sleep on? (Right side / Left side)
  11. Has your nose gotten wider? (Yes, noticeably / No, same as before)
  12. Do you get frequent headaches? (Yes, quite often / No, rarely)
  13. Which breast is larger? (Left is bigger / Right is bigger)
  14. What color is your urine? (Bright yellow / Dull or pale)
  15. Your age at conception plus the month number is... (An even number / An odd number)
  16. What does your gut feeling say? (no overthinking!) (It's a boy! / It's a girl!)
Pregnancy Symptoms

Boy or Girl? What Your Symptoms Say

Compare common pregnancy symptoms and what old wives' tales say about each one.

Symptoms Said to Mean Boy

  • 💙 Less morning sickness
  • 💙 No mood swings
  • 💙 Headaches are rare
  • 💙 Craving salty and savory foods
  • 💙 Cold feet
  • 💙 Carrying low
  • 💙 Heart rate below 140 bpm
  • 💙 Body hair grows faster
  • 💙 Skin is drier than usual

Symptoms Said to Mean Girl

  • 💗 Severe morning sickness
  • 💗 Moody and irritable
  • 💗 Frequent headaches
  • 💗 Craving sweets and chocolate
  • 💗 Carrying high
  • 💗 Heart rate above 140 bpm
  • 💗 Dull, lifeless hair
  • 💗 Oily skin and pimples
  • 💗 Weight gain all over, not just the belly
  • 💗 Falling asleep on your right side
  • 💗 Feet don't grow during pregnancy

All symptom-based predictions are for entertainment. Only medical tests can determine gender accurately.

The Science

How is a baby's gender actually determined?

Fun predictors aside, this is what biology really says about boy or girl.

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Set at the moment of conception

Every egg carries an X chromosome. Sperm carry either an X or a Y chromosome. If an X sperm wins the race, the baby is a girl (XX). If a Y sperm wins, the baby is a boy (XY). It all happens in the very first moments after fertilization.

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The sperm speed myth

You may have heard that Y sperm (boy) swim faster but die sooner, and that X sperm (girl) live longer. While these are popular theories, no reliable study has shown you can meaningfully tip the odds — timing, diet, or positions included.

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Only two reliable answers

NIPT blood tests from around 10 weeks are 99%+ accurate. The anatomy ultrasound at 18–20 weeks is 95–99% accurate. Everything else — including every method on this page — is entertainment.

Sources & Further Reading

On the medical standard, Wikipedia explains: “Noninvasive prenatal testing (NIPT) is a method used to determine the risk for the fetus being born with certain chromosomal abnormalities… This testing analyzes small DNA fragments that circulate in the blood of a pregnant woman.” — Noninvasive prenatal testing, Wikipedia
On folklore methods like the ones on this site, Wikipedia notes: “‘Old wives’ tale’ is a colloquial expression referring to spurious or superstitious claims… considered superstition, folklore or unverified claims.” — Old wives’ tale, Wikipedia

On the calendar behind the chart, Wikipedia defines the Chinese calendar as “a lunisolar calendar created by or commonly used by the Chinese people.” — Chinese calendar, Wikipedia

How We Do This

Honest predictions, clearly scored

Most gender prediction sites pretend a coin flip is a diagnosis. We do the opposite — every method below is labelled for what it really is, so you can enjoy the guess without being misled.

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Consensus, not hype

Medical claims follow mainstream guidance on fetal sex determination. Only tests that read chromosomes or anatomy are called reliable.

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Labelled entertainment

The chart, Ramzi, skull, baking soda, ring and symptom myths are honestly marked at about 50% — pure chance, for fun.

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Private by design

Every prediction runs in your browser. Your dates and answers are never sent to a server or stored.

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Sources kept

Where we cite studies or reference material, we link it and attribute quotes, on every page.

See every method's real accuracy →  ·  How we research →

FAQ

Common questions

Most parents find out during the anatomy ultrasound around 18 to 20 weeks. NIPT can reveal gender as early as 10 weeks. See our complete timeline guide.

The Chinese gender chart claims 50 to 90 percent accuracy. In reality it has about a 50 percent chance, same as guessing. It is a fun tradition, not a medical test.

Dr. Ramzi published a 2011 study suggesting a link between placenta location and fetal gender. The study has not been peer-reviewed. Learn more in our Ramzi theory guide.

No. Multiple large studies found no significant difference between male and female fetal heart rates. The tale that above 140 bpm means girl is a myth.

Nub theory looks at the angle of the genital tubercle on ultrasound at 11-14 weeks. Over 30 degrees suggests a boy. Requires a clear profile view.

NIPT blood testing at 10 weeks is over 99% accurate. The 20-week anatomy scan is 95-99% accurate. All methods here are for entertainment.

You need lunar age at conception (your age + 1) and the lunar month of conception. Our tool calculates this automatically.

No scientific evidence. Based on the disproven idea that urine pH differs by fetal gender. For entertainment only.

No. Traditional gender prediction methods were designed for single pregnancies and cannot predict for multiples.

Mix first-morning urine with baking soda. If it fizzes, the myth says boy; no reaction says girl. There is no scientific evidence supporting this. The reaction depends on urine acidity, which varies with diet and hydration, not fetal gender.

Skull theory looks at skull shape on a 12-week ultrasound. A square jaw and pronounced brow ridge is said to suggest a boy, while a round, smooth skull suggests a girl. It has no scientific validation.

Suspend a ring on a string over the pregnant belly. Circular swinging motion is said to mean girl, back-and-forth movement means boy. This is caused by the ideomotor effect, not the baby's gender. Accuracy is about 50%.

Most people wait until after the 20-week anatomy scan when gender is confirmed with 95-99% accuracy. Some choose to reveal after NIPT results at 10-13 weeks. Plan the party whenever feels right for you.

Non-invasive methods like Chinese calendar, old wives' tales quizzes, and ring tests are completely safe. Only medical tests like ultrasound and NIPT should be relied upon for accurate gender determination.

No. The chart itself stays the same every year. What changes is how your lunar age and lunar month of conception land on the chart, because the Chinese lunar calendar shifts slightly each year compared to the regular calendar. A 2026 and a 2027 Chinese gender predictor both use the same traditional chart — our tool works for conceptions in any year.

In the Chinese system a baby is considered one year old at birth, because the time in the womb counts. Your lunar age then increases by one at Chinese New Year rather than on your birthday. That is why your lunar age is usually one or two years older than your regular age. Entering your birth date and due date lets the tool calculate it automatically.

The earliest reliable answer is a NIPT blood test from about 10 weeks. The anatomy ultrasound confirms it at 18 to 20 weeks, and nub theory gives a decent early guess from 12 to 14 weeks. Folklore methods can be tried anytime but are only about 50 percent accurate.

No home test reliably predicts sex. Baking soda, ring tests and symptom quizzes all perform at about chance because nothing about your urine, cravings or belly shape reflects the baby's chromosomes.

No. Traditional gender prediction methods were designed for a single pregnancy and give one answer. There is no valid way to predict the sexes of twins with the chart.

Yes. Every prediction runs entirely in your browser, so the dates and answers you enter are never sent to a server or stored. No tracking cookies, no account required.

More gender prediction methods to explore

📊 Accuracy Research 📊 Methods Compared 📅 vs Ramzi 📅 vs Nub 🔍 Ramzi vs Nub 🔍 Ramzi Theory 📏 Nub Theory 📅 Chinese Chart ✨ Old Wives' Tales 📆 Gender Timeline
Gender Reveal

Creative Ways to Share the News

Once you know (or have a strong guess!), try one of these memorable reveal ideas.

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Balloon Pop

Fill a box with pink or blue balloons and open it together.

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Cake Cutting

Bake a cake with pink or blue filling and slice to reveal.

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Smoke Bombs

Use colored smoke for dramatic outdoor photos.

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Sibling Reveal

Let the older sibling hold a sign or wear a special shirt.

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Photo Shoot

Plan a themed photo session to share on social media.

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Confetti Cannons

Shoot pink or blue confetti for an instant celebration.

Want more ideas? Read our complete guide