My Credit Karama score is 774 (08/11/10).
Hmm... check my signature! 
Bad karma, huh? 
TU FAKO's (which is what CK is) always underestimated my FICO's, although it's different for others.
Congrats on the real things!
@DaveinSC wrote:My score on Credit Karma was a little lower than my official FICO scores....to the tune of 20-25 points.
The CK scores for DW and me are about three times as much lower. I totally ignore them.
And this morning I realized they don't round up their utilization percentages. 
@DaveinSC wrote:My score on Credit Karma was a little lower than my official FICO scores....to the tune of 20-25 points. I wasn't worried about that, but wondering why this may be.
My EQ score is 795 and TU is 801..and my CKarma FAKO shows up as a 776, which leads me to think, "WTF"??
Again, not as much worried as curious.
Your CreditKarma FAKO's, along with PLUS scores, Vantage scores, and all the other FAKO's, are different from FICO's because they result from different score formulas.
It's like using two different recipes for apple pie. One doubles the cinnamon, another says to bake the crust first, the first says use 5 Granny Smith apples, the other says use 8. The resulting pies might both be delicious (or burned to a crisp, depending on your oven, of course ), but they won't taste the same.
"If only life were as easy as pie." Waitress (2007). 