What is the Tzolkin calendar
The Tzolkin is the sacred Mayan calendar, composed of 260 unique days. Unlike the 365-day Gregorian calendar, the Tzolkin combines 20 day signs called "nahuales" with 13 numbers, creating a cycle of 260 unique combinations.
Each nahual has a distinct energy, personality, and purpose. Knowing your nahual is like discovering your spiritual DNA according to the Mayan worldview.
The 20 Mayan nahuales
The 20 signs are: Imix (Crocodile), Ik (Wind), Akbal (Night), Kan (Seed), Chicchan (Serpent), Cimi (Worldbridger), Manik (Hand), Lamat (Star), Muluc (Moon), Oc (Dog), Chuen (Monkey), Eb (Road), Ben (Reed), Ix (Jaguar), Men (Eagle), Cib (Owl), Caban (Earth), Etznab (Mirror), Cauac (Storm), and Ahau (Sun).
How to calculate your nahual step by step
Step 1: Take your complete birth date (day, month, year).
Step 2: Convert the date to the Mayan Long Count system. This involves calculating the days elapsed since the Mayan reference date (August 11, 3114 BCE in the Gregorian calendar).
Step 3: Divide the total days by 260. The remainder determines your position in the Tzolkin.
Step 4: The remainder modulo 20 gives you your nahual (day sign). The remainder modulo 13 gives you your number or tone.
Step 5: Combine your nahual and tone to get your complete Tzolkin sign.
The easy way: use a calculator
Manual calculation is complex and error-prone. That's why we created the Exsignum Mayan calculator: just enter your birth date and instantly get your nahual, your tone, and a complete description of your Mayan energy.
What your nahual means
Each nahual has unique qualities. For example, if you are Ix (Jaguar), you have a deep connection with nature and spirituality. If you are Ahau (Sun), you radiate leadership and creativity. Your nahual is your life guide according to ancestral Mayan wisdom.
Why every Mayan calculator gives a different sign
It is the most repeated complaint from anyone looking up their nahual: two sites, two signs. It is not that one is broken, they are counting different things. There are three causes and it helps to know which one hit you.
1. The correlation. To move from the Gregorian calendar to the Mayan one you need a constant anchoring day 0 of the Long Count (4 Ajaw 8 Kumk'u) to a specific Julian Day Number. The GMT correlation (Goodman-Martinez-Thompson) uses 584283 and is the one Mayanists use; the Martin and Skidmore proposal uses 584286, three days later. Three days of difference means three day signs of difference. Exsignum uses GMT 584283 and says so inside the calculator itself.
2. Tzolk'in or Haab'. The Maya ran two calendars at once: the sacred 260-day Tzolk'in, which is what gives you the nahual and the tone, and the civil 365-day Haab', made of 18 months of 20 days plus 5 extra days. Some pages hand you your Haab' position and call it your "Mayan sign". It is not the same thing and it will never match.
3. The Dreamspell. The 13-Moon calendar or Dreamspell is a system created in 1987 by Jose Arguelles. It borrows the names of the 20 day signs, but it skips February 29 to keep exactly 365 days, so its count drifts one more day away from the traditional Tzolk'in with every leap year.
None of them is "the true one" by decree: they are systems with different rules. What you can demand from a calculator is that it tells you which one it uses, so you can compare. If it hands you a sign without naming the correlation, you have no way of knowing why it gave you that one.