How to Read the Chinese Gender Calendar: Step-by-Step Guide

Written by Sukie Chinese | Last Updated: May 10, 2026 | Last Reviewed: May 10, 2026

A clear, step-by-step walkthrough of how to read the traditional chart — from finding your lunar age and lunar month of conception to looking up the right cell and interpreting the final Boy or Girl prediction.

TL;DR

The Chinese Gender Calendar is a simple lookup table. Find the row for the mother's lunar age at conception, follow it across to the column for the lunar month of conception, and read the letter in the cell — B for Boy or G for Girl. The only tricky parts are converting your Western age to lunar age and converting your conception date to the correct lunar month. You can skip the math and use our calculator to handle both conversions automatically.

The Chinese Gender Calendar at a Glance

The Chinese Gender Calendar is a single grid. Not a formula, not a horoscope, not a complicated ritual — just a table. One axis of the grid lists possible ages for the mother, the other lists possible months of conception, and every cell in the interior holds exactly one value: Boy or Girl. When you "read" the chart, all you're doing is finding the right row, following it across to the right column, and looking at the letter sitting where those two lines cross.

What makes the chart feel confusing the first time you see it is that both inputs use the Chinese lunar calendar rather than the Western one. Your lunar age and the lunar month of conception are not the same numbers as your Western age and your Gregorian month. That's the main reason two people looking at the same chart can end up with two different answers — one of them is using the wrong numbers.

Once you understand what the two axes mean and how to convert your real-world information into lunar inputs, the rest is just a simple visual lookup. No math beyond counting, no interpretation, and no secret symbols. The goal of this guide is to make every step of that lookup feel obvious.

The Two Axes: Rows and Columns

Every version of the traditional chart has the same two axes. On the left side (the rows) you'll see numbers from 18 to 45. Those are the mother's possible lunar ages. Across the top (the columns) you'll see numbers from 1 to 12. Those are the possible lunar months of conception, with 1 being the first lunar month (starting at Chinese New Year) and 12 being the last lunar month of the year.

Each cell at the intersection of a row and a column contains a single prediction — usually shown as B (Boy) or G (Girl), or sometimes just color-coded blue and pink. Regardless of visual style, the meaning is the same: one row plus one column equals one answer.

Axis	Range	What It Represents
Rows	18 – 45	Mother's lunar age at conception
Columns	1 – 12	Lunar month of conception
Cells	B or G	The prediction for that row and column

Because both axes are small (28 possible ages and 12 possible months), the entire chart fits comfortably on a single screen or page. You do not need to search a database, solve an equation, or decode anything. You just find the right box.

Step 1: Find Your Lunar Age

The first input is the mother's lunar age at the moment of conception. This is the most misunderstood part of the chart, so it's worth slowing down. There are three things people often get wrong here:

They use their Western age, not their lunar age.
They use their lunar age today, not their lunar age at conception.
They forget that lunar age gains a year at Chinese New Year, not at their birthday.

Lunar age works differently from Western age. In the traditional Chinese system, a baby is considered one year old at birth (not zero), and everyone gains a year at Chinese New Year rather than on their own birthday. That means, depending on the time of year, your lunar age is usually either one or two years higher than your Western age.

Here's a quick example. Imagine a mother born on June 15, 1993. On November 5, 2025 she's 32 years old by Western reckoning. To find her lunar age, you first start with her Western age (32), then check whether Chinese New Year 2025 had already passed at the time of conception — it did, so she gained one lunar year on Feb 17, 2025. Combined with the "born at age 1" rule, her lunar age at conception is 33 or 34 depending on the exact conversion used.

If all of this sounds fiddly, it is. Most people don't calculate lunar age by hand — they use a converter. Our lunar age calculator takes a date of birth and a conception date and returns the correct lunar age in one click.

Step 2: Find Your Lunar Month of Conception

The second input is the lunar month in which conception happened. This is also easy to get wrong, because lunar months don't line up with Gregorian months on the calendar on your wall. A single Gregorian month like "February" can overlap two lunar months, and the boundaries shift every year because the Chinese New Year itself moves.

For example, in 2026 the first lunar month runs approximately from February 17 to March 18. The second lunar month runs from around March 19 to April 16, and so on. If conception happened on March 20, 2026, the chart's "lunar month of conception" is the second lunar month, not the third, and not "March." Using the Gregorian month number would pull you into a different column and produce a different answer.

To do this conversion manually, you need a Chinese lunar calendar reference for the year of conception. You look up where your conception date falls relative to the lunar month boundaries, then record the lunar month number (1 through 12). Again, a good calculator handles this automatically, which is why we recommend using ours unless you enjoy the research.

One tip: if you're not sure of your exact conception date, use an estimate based on your last menstrual period (LMP). Conception typically occurs about two weeks after the first day of your LMP, and that estimate is usually close enough to land in the right lunar month.

Step 3: Look Up the Cell

Once you have your lunar age and lunar month of conception, reading the chart is the easy part. Find the row labeled with your lunar age on the left side of the chart, then slide your finger (or your eyes) across that row until you reach the column labeled with your lunar month at the top. The cell where those two lines meet is your answer.

The cell will contain one value, not two, and not a range. It will say "Boy" or "Girl" (sometimes just "B" or "G"), or it will be colored blue for boy and pink for girl. There is no partial result, no percentage, and no confidence score. The chart is binary.

If you want to double-check that you have the right cell, slide your finger back along the row to make sure you're still in the correct row, and up along the column to make sure you're still in the correct column. Row and column misalignment is one of the most common reading mistakes, especially on a phone screen where the cells are small.

Illustrative Preview: A Slice of the Chart

Below is a small, illustrative slice of the Chinese Gender Calendar showing three sample lunar ages (28, 30, and 32) across all 12 lunar months. The values shown here are for display only and should not be used as your final prediction — use our full calculator to get an accurate lookup for your actual lunar age and month.

Lunar Age	1	2	3	4	5	6	7	8	9	10	11	12
28	B	G	B	G	B	B	B	B	G	G	G	B
30	B	G	G	B	B	G	B	G	B	G	B	G
32	G	B	B	G	G	B	B	G	B	G	B	G

Illustrative only. The full traditional chart covers lunar ages 18 – 45. Always run your actual numbers through the calculator for a real prediction.

Step 4: Interpret the Result

Once you've landed in the right cell, the result is whatever is printed there — a single Boy or Girl prediction. That's the entire output of the chart. There is no probability ("70% boy"), no confidence level ("very likely a girl"), and no ranking. If the cell says Boy, the chart predicts Boy. If the cell says Girl, the chart predicts Girl.

It's important to interpret this result in the right spirit. The Chinese Gender Calendar is a traditional folk method with no scientific backing. It is a fun cultural artifact used in baby showers, gender reveals, and family conversations — not a medical diagnosis and not a prophecy. Treat it the way you'd treat a fortune cookie: enjoyable, culturally meaningful, and not something to plan the nursery around.

For medically accurate gender information, your options are NIPT (non-invasive prenatal testing) from around 10 weeks of pregnancy, or an anatomy-scan ultrasound at 18 – 22 weeks. See our overview of US gender prediction methods for how those options compare.

Cheat Sheet: The 4 Steps in One Box

Find lunar age — Convert the mother's Western age on the conception date into lunar age.
Find lunar month — Identify which Chinese lunar month contained the conception date.
Look up the cell — Row = lunar age, column = lunar month. Read the value at the intersection.
Interpret as folklore — Single Boy/Girl result. No probability. Fun only, not medical.

Common Mistakes When Reading the Chart

Most "wrong" predictions happen not because the chart itself is strange, but because of simple input errors. Here are the five most common mistakes people make when reading the Chinese Gender Calendar, in roughly the order they happen.

Using Western age instead of lunar age. The chart was designed for lunar age, which is usually one or two years higher. Using Western age often pulls the lookup into the wrong row.
Using the due date instead of the conception date. The chart cares about when the baby was conceived, not when they're expected to be born. Due dates are roughly 40 weeks later, which almost always lands in a different lunar month.
Using the Gregorian month instead of the lunar month. "March" on your calendar is not the same thing as the third lunar month. Gregorian and lunar months drift against each other throughout the year.
Looking at the wrong row or column. On small-print or phone screens, it's easy to slide one row too high or one column too far right. Use a ruler or your finger to keep alignment.
Using age today instead of age at conception. If you're already 5 months pregnant, you may be a year older than you were when you conceived. The chart uses age at the moment of conception, not at the moment of lookup.

All five of these mistakes disappear when you use an automated calculator that accepts a date of birth and a conception date. You enter raw information, and the tool handles all the lunar conversions internally.

Example: Reading the Chart for a Real Mom

Let's walk through a complete, realistic example so the four steps feel concrete. Meet our example mom: she was born on March 10, 1996, which makes her 30 years old by Western reckoning. She conceived on November 5, 2025. How do we read the chart for her?

Step 1 — Lunar age: On November 5, 2025, Chinese New Year 2025 (Jan 29, 2025) has already passed, so she has gained her lunar year. Starting from her Western age of 30 and applying the "born at age 1" rule and New Year adjustments, her lunar age at conception is 31.

Step 2 — Lunar month: The 9th lunar month of 2025 runs from late October to mid November in the Gregorian calendar. November 5, 2025 falls inside the 9th lunar month, so her lunar month of conception is 9.

Step 3 — Look up the cell: On the chart, find the row labeled 31 on the left side, then follow it across to the column labeled 9 at the top. The value in that cell is the prediction for this pregnancy.

Step 4 — Interpret: Whatever letter is in that cell (B or G) is the chart's single answer. For an exact lookup against a current digital chart, run the same inputs through our calculator.

Notice that this example never once touches the Western month (November), the due date, or her age on the day she's reading the chart. It uses only lunar age at conception and lunar month of conception. That discipline is everything you need to read the chart correctly.

Quick Reference: What Each Section of the Chart Means

If you ever open the chart and feel momentarily lost, here's a one-glance reminder of what every part of it does. Most printed versions of the chart follow this same layout, even when the colors or styling differ.

Top row (column headers): The numbers 1 through 12 representing the lunar months of conception. This is the horizontal axis of the lookup.
Left column (row headers): The numbers 18 through 45 representing the mother's lunar age. This is the vertical axis of the lookup.
Inner cells: Each cell contains the chart's prediction — Boy or Girl — for that specific combination of lunar age and lunar month.
Title / borders / styling: Purely decorative. The chart's accuracy doesn't depend on the graphic design; any correctly laid out version produces the same answers.

Frequently Asked Questions

How do I read the Chinese Gender Calendar?

Find the row for the mother's lunar age at conception, follow it across to the column for the lunar month of conception, and read the value in the cell where they meet. That single Boy or Girl value is the chart's prediction.

What are the rows and columns on the chart?

Rows are the mother's lunar age (typically 18 through 45), and columns are the lunar month of conception (1 through 12). Each interior cell contains one prediction for that specific row and column combination.

Do I use Western age or lunar age?

Always use lunar age. Lunar age is usually one or two years higher than Western age because the Chinese system counts a baby as one year old at birth and adds a year at Chinese New Year. Using Western age is the single most common reading mistake.

Do I use the conception date or due date?

Use the conception date. The chart's column is determined by the lunar month in which conception happened, not the month of the due date or the month you found out. If the conception date is unclear, estimate it as about two weeks after the first day of your last menstrual period.

Why do different sources give me different chart predictions?

Different sources can disagree because of different inputs (Western vs lunar age, Gregorian vs lunar month) or because some sites use a slightly different version of the chart. For consistent results, always use lunar age and lunar month of conception with a calculator that handles the conversions automatically.