Mayan Zodiac Calculator
Enter a birth date to calculate its Tzolk’in day number and day name using the traditional 260-day Maya calendar cycle. This is an entertainment and cultural reference tool, not a prediction service.
Please enter a valid date.
What is the Mayan Tzolk’in?
The Tzolk’in is a 260-day ritual calendar formed by a cycle of 13 numbers combined with 20 named day signs. A date therefore has both a number and a day name.
How to Use the Mayan Zodiac Calculator
- Enter your birth date.
- Select Calculate.
- The result shows the Tzolk’in number and day sign for that date.
Pick your birth date (any Gregorian date works) and select Calculate. The result shows the Tzolk’in number from 1 to 13 and the day sign, such as 4 Ajaw. The calculator uses the widely used Goodman-Martínez-Thompson (GMT) correlation to line the Maya count up with the Gregorian calendar.
How the calculation works
The calculator converts the Gregorian date to a Julian day count and applies the widely used GMT correlation constant (584,283) to map the date onto the repeating 13-number and 20-name Tzolk’in cycles.
The calculator works from the calendar date only and ignores time zones. The number comes from the day count modulo 13 and the day sign from the day count modulo 20, so the two cycles run side by side and the same pair only returns after 260 days.
Mayan Tzolk’in Calculation Explained
The Tzolk’in uses a repeating cycle of 13 numbers and 20 named day signs, creating 260 unique combinations. To calculate a result, the tool converts the entered Gregorian date into a Julian day count and applies the GMT correlation constant to align that date with the traditional cycle. The final position determines both the number and the named day sign. Because historical calendar correlations can be discussed differently, the result should be understood as one established calendrical calculation method rather than a scientific measurement or prediction.
Another constant, 584,285, is sometimes used and moves every result by two days. This calculator uses 584,283 only and has no setting to change it.
Worked Example
For example, enter 21 December 2012. The result is 4 Ajaw, the day on which the 13th b’ak’tun of the Maya Long Count ended. Enter 22 December 2012 and the result is 5 Imix: the number rises by one and the day sign moves to the next name in the cycle. Names repeat every 20 days and numbers every 13, so the full combination repeats after 260 days.
To check the 260-day cycle, enter 1 January 2026 and 18 September 2026. Both dates give 5 Kawak. The calculator shows only the Tzolk’in day. Traditional readings of the day sign vary and are not calculated here.
The 20 Tzolk’in Day Signs
The day signs repeat in this fixed order. Each one is paired with a number from 1 to 13, which gives 260 different days in the cycle.
| No. | Day sign |
|---|---|
| 1 | Imix |
| 2 | Ik’ |
| 3 | Ak’bal |
| 4 | K’an |
| 5 | Chikchan |
| 6 | Kimi |
| 7 | Manik’ |
| 8 | Lamat |
| 9 | Muluk |
| 10 | Ok |
| 11 | Chuwen |
| 12 | Eb’ |
| 13 | B’en |
| 14 | Ix |
| 15 | Men |
| 16 | K’ib’ |
| 17 | Kab’an |
| 18 | Etz’nab’ |
| 19 | Kawak |
| 20 | Ajaw |
Mayan Zodiac Calculator — FAQs
What does the result mean?
It identifies the Tzolk’in calendar combination associated with the date. Traditional interpretations vary and are not calculated here.
Is this the same as a modern horoscope?
No. The Tzolk’in is a Maya calendrical system and is not identical to Western astrology.
Does the calculator use the Gregorian calendar?
Yes. You enter a normal Gregorian calendar date, which the calculator converts for the Tzolk’in cycle.
How many day signs are in the Mayan calendar?
There are 20 day signs. They combine with the numbers 1 to 13, which gives 260 unique days in the Tzolk’in cycle.
Why do Mayan calendar converters give different results?
Converters can use different correlation constants to line the Maya count up with the Gregorian calendar. This calculator uses the common GMT constant 584,283. Another constant, 584,285, moves every result by two days.
Mayan astrology sign, day sign or birth chart?
People often search for a Mayan astrology calculator or Mayan horoscope calculator when they want the Tzolk’in combination for a birth date. The output here is a calendar day name and a number from 1 to 13. It does not generate a personality reading, predictions or a complete birth chart.
The 20 day names and 13 numbers repeat in a 260-day cycle. This tool uses the GMT correlation constant 584,283, as described in its calculation notes. Converters using another correlation or calendar convention can give a different result for the same entered date.
A Tzolk’in day sign is not interchangeable with a Western sun sign or an Aztec calendar result. To find a Western date-based sign, use the Zodiac Sign Calculator.