How to use the Body Fat Calculator
Estimate estimated body fat from weight, height, age with the Body Fat Calculator. It includes BMI estimate, U.S. Navy workflows, so choose the one that matches the values you actually know. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision.
Step by step
- For the Body Fat, enter weight, height, age, sex, neck circumference. Keep each value in the unit displayed beside its field.
- Review the selected Body Fat workflow and inputs, then read estimated body fat in the result panel.
- Change one Body Fat assumption at a time to compare scenarios. Use Reset to restore this tool's worked example values.
How the calculation works
Selectable BMI-age-sex and U.S. Navy circumference estimates.
Worked example
In the Body Fat worked example, weight 75 kg, height 175 cm, age 35 years, sex Male produces estimated body fat of 21.24 %. BMI-age-sex method. Review the displayed units before comparing the result.
Understanding the result
The Body Fat reports estimated body fat. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision. Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional.
How to check the answer
Check the Body Fat estimate by confirming the units and supported ranges for weight, height, age. Compare estimated body fat with another published method or direct measurement when available, and ask a clinician before using it for a health decision.
Common questions
What does the Body Fat calculate?
Estimate estimated body fat from weight, height, age with the Body Fat Calculator.
Which Body Fat inputs have the biggest effect?
estimated body fat responds directly to weight, height, age, sex, neck circumference. Change one input while holding the others constant to see its effect.
Is the Body Fat result exact?
Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional. Recheck weight, height, age and use estimated body fat only for a decision where that level of precision is appropriate.