How Body Fat Calculator works
The estimate uses the body measurements requested by the calculator and the selected estimation method. Results can differ from measurements made with clinical or laboratory methods.
Estimate body fat percentage, lean mass, and fat mass using the U.S. Navy circumference-based method.
Estimate body fat percentage, lean muscle mass, and fat mass using tape measurements
Calculated using the official U.S. Navy Circumference method.
A browser-based body fat calculator that estimates body fat percentage, lean mass, and fat mass using a U.S. Navy circumference-based method.
Choose your preferred unit system (Metric: cm/kg or Imperial: inches/lbs).
Select your gender and enter your age and total body weight.
Enter height, neck, waist, and hip circumference (for females).
Inspect body fat percentage, lean mass, fat mass, and American Council on Exercise (ACE) category placement.
Calculates body fat percentage using the U.S. Navy Circumference algorithm
Itemized breakdown of Lean Muscle Mass vs. Fat Mass in kg or lbs
Categorizes results against American Council on Exercise (ACE) standards
Full Metric (cm, kg) and Imperial (in, lbs) unit support
Browser-based privacy — zero health data logged or uploaded
The estimate uses the body measurements requested by the calculator and the selected estimation method. Results can differ from measurements made with clinical or laboratory methods.
Health calculations are estimates based on the information entered. They do not replace examination, testing or advice from a qualified healthcare professional. Results may be less representative for children, pregnancy, medical conditions or unusual circumstances unless the tool specifically states otherwise.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
Answers about how the tool works, its limitations, and how your information is handled.
The U.S. Navy circumference method is an estimate and can differ from results obtained with DEXA, hydrostatic weighing, or other measurement methods. Measurement technique and body shape can affect the result.
Measure neck circumference below the larynx, waist at the narrowest point or navel level, and hips at the widest point around the buttocks (for women).
No. The result is an informational estimate based on the inputs supported by the calculator. It does not replace advice, diagnosis or treatment from a qualified healthcare professional.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
Continue with related UtilsDesk tools for the same type of task. Each tool has its own instructions, examples, methodology notes, and limitations.