Calculate your body’s fat mass and lean body mass in kilograms based on your body fat percentage.
The body fat mass calculator calculates the absolute numbers of body fat pounds and obesity when you know your body fat percentage and total weight. This helps set realistic weight loss and body composition goals.
The calculator is free and works in your browser without registration. The site offers over 200 calculators.
Fat mass (kg) = Weight × Body Fat % / 100. Lean mass (FFM) = Weight − Fat Mass.
Enter your information in the calculator fields – the result updates immediately. You can try different values to compare scenarios.
80 kg, body fat % 22 → fat mass 17.6 kg, FFM (muscle + bone + organs) 62.4 kg.
This example illustrates a typical situation. Enter your own data to get a personal result.
The calculator serves individuals, entrepreneurs, students, and professionals. All calculators on the site are free and no registration is required.
The results are indicative – official decisions are always made based on calculations by professionals.
Calculate your body fat mass and lean body mass in kilograms based on body fat percentage. Fill in the requested information in the form, and the fat mass calculator will show the result instantly.
Yes, the fat mass calculator is completely free and does not require registration. All FiksuLaskuri health calculators are free of charge.
No. The calculations are done entirely in your browser and the data you enter is not sent or stored on the server.
No. The fat mass calculator is a rough guide, not a medical diagnosis. For health-related decisions, it is advisable to consult a healthcare professional.
Yes – at the bottom of the page, you can see other calculators related to the same topic that may also interest you.