How often are my KK's up against AA Preflop?

[rufus]

The chance that your opponent (heads up) has AA when you already have KK is 6 in 1225 -- roughly 1 in 204. If you're playing ring games you can reasonably approximate the likelihood that any of them has that by multiplying by the number of opponents. For a 6 or 10 man ring, your number is pretty close to the expected rate.