Ancient History
Math and Arithmetic
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How do you count BC years?

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Wiki User
2011-08-25 14:52:42

BC + AD - 1

You have to subtract 1 after adding the year BC to the AD year.

There is no year Zero, so the calendar is not a proper timeline.

This is not a matter of interpretation (like the new millennium


If you were born in 1 B.C., then you were one year old in A.D.

1. That's 1 + 1 - 1.

If the start and end years are both BC, then it's a simple

subtraction of the smaller number from the larger number, just as

you would calculate your own age today.

Note that "BC" is properly written after the year, but "AD"

(Anno Domini) goes before the year. If you use the more inclusive

"Common Era" notation, then both "CE" and "BCE" go after the


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