: How accurate is body fat calculator? I'm 26 & 5'5" (6weeks postpartum). I weigh 180lbs, BMI of 29 & 27% fat. My goal weight was 140 till I started doing some math. If I lose 40lbs of fat I'll only have about 9lbs

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Fat percentage by measurements is towards the lower end of the scale dor reliable and accurate.

The order generally goes (with the caveat that the tester must be trained/experienced)

DEXA scan
Underwater weighing
9 site caliper (there are also 7 5 and 3 site methods, with accuracy decreasing)
Measurements
Bioelectric impedence (note: while it can be inaccurate, the same machine will generally give the same error rate, so it can be used to track trends).

As far as goal weight, that is going to be highly personal, and somewhat irrelevant. I would rather have someone pursue a picture of what they want to look like. An arbitrary weight goal may be unhealthy, unattainable or not allow you to enjoy life. If you are happy with how you look and are fit enough to enjoy life and your pursuits, that is a goal to shoot for. Only worry about a specific weight if it matters for something else.