ESTIMATED BODY FAT
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This calculator gives a general estimate only and should not be treated as a medical assessment.
How to estimate body fat percentage
Body fat percentage estimates the proportion of body weight made up of fat tissue. This calculator uses body measurements to estimate body fat percentage using a commonly used circumference-based formula.
The estimate is based on height, neck circumference, waist circumference and, for females, hip circumference.
Example measurement context
A taller person with a smaller waist measurement relative to height may generally produce a lower estimated body fat percentage than someone with a larger waist measurement.
What this calculator is for
This body fat calculator gives a general estimate of body fat percentage using body measurements. It may be useful for general health awareness, fitness tracking or understanding changes in body composition over time.
The result is only an estimate and should not be treated as a diagnosis or exact measurement. Results can vary depending on body shape, muscle mass, hydration, measurement technique and other factors.
Important note
This calculator is for general informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare professional before making significant changes to your diet, exercise routine, hydration, weight management or lifestyle, especially if you have a medical condition, take medication, are pregnant, or have specific health concerns.
Frequently Asked Questions
What is body fat percentage?
Body fat percentage estimates how much of the body is made up of fat tissue compared with total body weight.
Is this result exact?
No. This calculator gives an estimate only and should not replace professional assessment methods.
Why are body measurements used?
Circumference measurements are commonly used to estimate body fat because they are simple, accessible and do not require specialist equipment.
Does the UK use an official body fat formula?
There is no single official UK formula for estimating body fat percentage. Different methods may be used depending on the setting, including body measurements, skinfold calipers, body composition scales and clinical assessment tools. This calculator uses a commonly used circumference-based body fat estimation method sometimes referred to as the U.S. Navy method.
Can hydration or muscle mass affect results?
Yes. Hydration, muscle mass, body shape and measurement accuracy can all affect body fat estimates.
Should I speak to a healthcare professional?
Yes, especially before making significant changes to your diet, exercise routine, weight management or lifestyle, or if you have a medical condition, take medication, are pregnant, or have specific health concerns.