Mayan calendar converter
This mayan calendar converter turns a Gregorian date into the Maya Long Count, the 260-day Tzolk’in and the 365-day Haab’ – and converts a Long Count back into a date.
How it is calculated
The Maya Long Count counts days from a creation date: with the generally accepted GMT correlation, 13.0.0.0.0 4 Ajaw 8 Kumkʼu fell on 11 August 3114 BCE (Julian Day 584283). The count reached 13.0.0.0.0 again on 21 December 2012 – a Tzolkʼin day 4 Ajaw and a Haabʼ day 3 Kʼankʼin.
How the three calendars work
- Long Count: bʼakʼtun.kʼatun.tun.winal.kʼin, where 1 kʼin = 1 day, 1 winal = 20 days, 1 tun = 360 days, 1 kʼatun = 7200 days and 1 bʼakʼtun = 144000 days.
- Tzolkʼin: the numbers 1–13 run alongside 20 day names (Imix … Ajaw), so the same pair returns every 260 days.
- Haabʼ: 18 months of 20 days plus the 5 days of Wayebʼ make 365 days; each month starts with day 0, its “seating”.
Tzolkʼin and Haabʼ together form the Calendar Round, which repeats after 18980 days (about 52 years). Wikipedia’s worked example checks the rules: 9.12.2.0.16 is 1383136 days after creation and falls on 5 Kibʼ 14 Yaxkʼin.
Examples (GMT 584283)
| Date | Long Count | Tzolkʼin | Haabʼ |
|---|---|---|---|
| 2012-12-21 | 13.0.0.0.0 | 4 Ajaw | 3 K’ank’in |
| 2000-01-01 | 12.19.6.15.2 | 11 Ik’ | 10 K’ank’in |
| 2026-01-01 | 13.0.13.3.19 | 5 Kawak | 17 K’ank’in |
| 1987-08-16 | 12.18.14.5.1 | 1 Imix | 9 Yaxk’in |
Other calendar converters: Chinese calendar, Hebrew date converter and the day of the week calculator.
Correlation and limits
The link between the Maya count and our calendar is not fixed by the inscriptions themselves. Most researchers use 584283; the Thompson (Lounsbury) value 584285 shifts every date by two days and can be chosen above. Dates before the Gregorian reform of 1582 are given in the proleptic Gregorian calendar, not the Julian one.
Frequently asked questions
What was 21 December 2012 in the Maya calendar?
The Long Count reached 13.0.0.0.0, the end of the 13th bʼakʼtun, on a day 4 Ajaw 3 Kʼankʼin (GMT correlation). The count simply continued.
What is the Long Count?
A day count from the Maya creation date in units of 1, 20, 360, 7200 and 144000 days, written as bʼakʼtun.kʼatun.tun.winal.kʼin.
What is the difference between Tzolkʼin and Haabʼ?
The Tzolkʼin is a 260-day cycle of 13 numbers and 20 day names; the Haabʼ is a 365-day year of 18 months plus 5 days of Wayebʼ.
Which correlation does the converter use?
The GMT correlation 584283 by default. You can switch to 584285, which gives dates two days earlier in the Maya count.
What is my Maya birthday sign?
Enter your birth date: the Tzolkʼin day (for example 1 Imix) is what many people call their Maya day sign.
Sources and legal basis
- Wikipedia, Mesoamerican Long Count calendar: GMT correlation 584,283 (13.0.0.0.0 4 Ajaw 8 Kumkʼu = 11 August 3114 BCE proleptic Gregorian), 13.0.0.0.0 again on 21 December 2012, worked example 9.12.2.0.16 = 5 Kibʼ 14 Yaxkʼin, correlation table incl. Thompson (Lounsbury) 584,285 (read 14.10.2026)
- Wikipedia, Tzolkʼin: 20 named days from Imix to Ajaw combined with the numbers 1–13 (260 days) (read 14.10.2026)
- Wikipedia, Haabʼ: 18 months of 20 days plus Wayebʼ of 5 days; day 0 is the “seating” of a month (read 14.10.2026)
As of: · Editorial policy
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