top of page


Human Era
Conversion Calculator

The calendar most commonly used today places year 1 CE at a point in time during the Roman Empire. That system labels earlier human accomplishment "before" or assigns negative numbers. 

Emiliani's HE calendar places year 1 HE much earlier, when humans were settling into agricultural communities (loosely matching the beginning of the geological Holocene Epoch).  Calling any point in time "year 1" is somewhat arbitrary. EMILIANI set 1 HE exactly 10,000 years before 1 CE. 

With this calculator, you can convert between the BCE or BC and
HE systems. 


Calculator was updated and improved in 03/12023.

Enter a number in a yellow cell for conversion

Also... HE conversion extension for your browser

9 Jan Cavel screenshot and link.jpg

Alternate Method
Scroll to find the conversion

bottom of page