Mayan gender calendar 2018
This chart is a game. The mother’s age and the conception date cannot reliably predict a baby’s sex.
Haab cycle: 18 periods of 20 days, then 5 days of Wayeb.20 Haab periods intersect this Gregorian year
Download PDF · 2018
Two A4 landscape pages: the chart, then the date ranges and instructions.
B = BoyG = Girl
Scroll horizontally to see every month. The age column stays visible.
| Age | 14Kankin – | 15Muan – | 16Pax – | 17Kayab – | 18Cumku – | 19Uayeb – | 1Pop – | 2Uo – | 3Zip – | 4Zotz – | 5Tzec – | 6Xul – | 7Yaxkin – | 8Mol – | 9Chen – | 10Yax – | 11Zac – | 12Ceh – | 13Mac – | 14Kankin – |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 16 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 17 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 18 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 19 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 20 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 21 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 22 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 23 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 24 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 25 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 26 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 27 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 28 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 29 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 30 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 31 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 32 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 33 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 34 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 35 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 36 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 37 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 38 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 39 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 40 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 41 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 42 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 43 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 44 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 45 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 46 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 47 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 48 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
| 49 | B | G | B | G | B | G | G | B | G | B | G | B | G | B | G | B | G | B | G | B |
| 50 | G | B | G | B | G | B | B | G | B | G | B | G | B | G | B | G | B | G | B | G |
How to read this calendar
- Find the estimated conception date in the Gregorian date ranges. The first and last periods are limited to the chosen year. Wayeb (Uayeb) is period 19.
- Use the mother’s completed age at conception, from 16 to 50. Age increases on her birthday: change rows on that date if a period includes her birthday.
- Read the cell at that age and period. In this game, an even sum of age and period number means girl; an odd sum means boy. No probability is implied.
Haab periods and Gregorian date ranges
| Haab period | Name | Haab days (from 0) | Gregorian dates |
|---|---|---|---|
| 14 | Kankin | 15–19 | – |
| 15 | Muan | 0–19 | – |
| 16 | Pax | 0–19 | – |
| 17 | Kayab | 0–19 | – |
| 18 | Cumku | 0–19 | – |
| 19 | Uayeb | 0–4 | – |
| 1 | Pop | 0–19 | – |
| 2 | Uo | 0–19 | – |
| 3 | Zip | 0–19 | – |
| 4 | Zotz | 0–19 | – |
| 5 | Tzec | 0–19 | – |
| 6 | Xul | 0–19 | – |
| 7 | Yaxkin | 0–19 | – |
| 8 | Mol | 0–19 | – |
| 9 | Chen | 0–19 | – |
| 10 | Yax | 0–19 | – |
| 11 | Zac | 0–19 | – |
| 12 | Ceh | 0–19 | – |
| 13 | Mac | 0–19 | – |
| 14 | Kankin | 0–14 | – |
Dates and method
GMT here means Goodman–Martínez–Thompson, the convention linking the two calendars. Haab days are numbered 0–19, or 0–4 during Wayeb. This cycle has no extra leap day.
Dates use the GMT correlation, with 21 December 2012 = 3 Kankin. Periods are numbered 1–19 for this game; the historical origin of its prediction rule is unestablished.
The Smithsonian explains the Haab and these date correspondences, not a method for predicting a baby’s sex.