Boneless, skinless, grilled chicken breast actual calories

Nutrition Q&A [Moderated]
1

In trying to be more precise with my macros I weighed my grilled chicken breast. I then looked to figure the calories per gram.
Turns out there is a vast disparity in the data.
Low is myfitnesspall at ~1cal/gram
High was 1.6cal/gram
Most others are 1.1-1.3 cal/gr

Thoughts about which I should use?

2

I don’t know what you’re trying to measure, but the USDA data for raw chicken is what I use. I don’t track calories directly either.