Maya Calendars

Long Count

Core Long Count positions and larger periods. The calculator sums positions and normalizes them to the five-position notation.

Use the reference to understand Long Count units. In the converter, select a date and era, or enter the count units for the reverse conversion. Check the field order and the stated GMT correlation.

01

Long Count reference

Core Long Count positions and larger periods. The calculator sums positions and normalizes them to the five-position notation.

Historical Maya calendars Smithsonian Living Maya TimeHistorical Maya calendars FAMSI · GMT correlationHistorical Maya calendars J. Eric S. Thompson · Mesoweb
core position k’in 1 days
core position uinal 20 days
core position tun 360 days
core position k’atun 7,200 days
core position b’ak’tun 144,000 days
extended period piktun 2,880,000 days
extended period kalabtun 57,600,000 days
extended period k’inchiltun 1,152,000,000 days
extended period alautun 23,040,000,000 days
Total days0 Normalized Long Count: 0.0.0.0.0
02

Long Count converter

Converts a Gregorian date to Long Count and back. The correlation constant is explicit and can be changed.

Historical Maya calendars Smithsonian Living Maya TimeHistorical Maya calendars FAMSI · GMT correlationHistorical Maya calendars J. Eric S. Thompson · Mesoweb
Gregorian date
Long Count
Long Count13.0.0.0.0
Gregorian date2012-12-21
Calendar Round4 Ajaw · 3 K’ank’in