Body Fat Calculator

Estimate your body fat percentage using circumference measurements. This tool provides a practical screening estimate, not a medical diagnosis.

Calculate Body Fat Percentage

Enter your measurements carefully. Hip circumference is mainly required for female estimates in common measurement-based formulas.

Body fat input fields

Metric mode: enter height in centimeters.

Measure around the neck at a consistent point.

Measure around your natural waistline.

Usually required for female body fat estimates.

Your result

Your body fat estimate will appear here after calculation.

Disclaimer: Body fat formulas provide general estimates and do not replace medical evaluation or diagnosis.

Understanding Body Fat Percentage

What does body fat percentage represent?

Body fat percentage estimates how much of your total body weight is fat mass. It can add useful context beyond scale weight alone.

How is this estimate calculated?

Measurement-based formulas use height and circumference values to estimate body fat percentage. Accuracy depends on consistent measurements.

How to use this estimate

  • Track changes over time rather than focusing on one result.
  • Measure under similar conditions for consistency.
  • Combine with BMI, strength, and fitness performance trends.
  • Use as guidance, not as a standalone health diagnosis.

Body Fat Calculator FAQ

Is body fat percentage more useful than body weight?

It can be more informative in many cases, because it helps separate fat mass trends from total scale weight changes.

How accurate are circumference-based estimates?

They are useful for trend tracking, but they are still estimates and can vary with measurement technique.

Why is hip measurement often needed for female estimates?

Common formulas for female body fat estimation include hip circumference to improve the estimate model.

How often should I measure body fat?

Every few weeks is usually enough to monitor progress without overreacting to short-term fluctuations.

Can hydration affect body composition readings?

Yes. Hydration and measurement timing can affect many body composition methods and should be kept consistent.

Is this calculator a medical diagnostic tool?

No. It is an estimation tool for education and planning, not for diagnosis or treatment decisions.