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LeanCheck
The US Navy method: neck, waist, height (and hip for women) — no caliper required.
Adult men: 10–22% is typical, athletes 6–13%. Adult women: 18–30% typical, athletes 14–20%. Below those ranges affects hormones and immunity.
Daily energy expenditure with personalised macro splits.
OpenBody mass index with healthy-range guidance.
OpenDaily hydration target based on weight, activity, and climate.
OpenConvert between distance, time, and pace for any run.
OpenEstimated body fat
23.7%
US Navy circumference method
What you entered
Waist minus neck
86 − 38 cm= 48.0 cmUS Navy formula (male)
86.010×log₁₀(48.0) − 70.041×log₁₀(178) + 36.76= 23.7%Result
Estimated body fat: 23.7%
The US Navy method estimates body fat from circumference measurements — it's a reasonable field estimate, but calipers or a DEXA scan are more accurate if precision matters.