How do y'all get your body fat estimates?

I see them all the time in OYS and elsewhere and I wonder if I'm missing something trivial. I have a bathroom scale that shows me a number but I have no idea if I can trust it.

Extrapolating the trends if I keep up the weight loss and the body fat at my current pace, I'm going to get to about 154 lbs when I hit 15%, which to me is scary low (I'm 6').

UPDATE:

Body scale estimate: 16.5%

Calipers: 14.8%

US Navy Calculator: 12%