What is Body Fat Calculator?
Body Fat Calculator helps you estimate body-fat percentage using the measurements requested by the method.
The main result is estimated body fat. The formula, example and assumptions below explain how to interpret it.
How to use Body Fat Calculator
Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.
- Gather weight (kg), height (cm), age and sex used by the formula. Use values from the same situation or reporting period.
- Replace the example weight with your own value, then complete the other fields. Check the displayed units and each selected option.
- Select Calculate and read estimated body fat. Change one input and calculate again to compare a second scenario. Reset restores the original example.
- Enter weight in kg, at least 20 and at most 500. Decimals are accepted.
- Enter height in cm, at least 100 and at most 250. Decimals are accepted.
- Enter age, at least 18 and at most 100. Use a whole number.
- Choose sex used by the formula from Male and Female.
Body Fat Calculator: a worked example
With the inputs below, the result is 19.765744 % (estimated body fat). Follow the example, then replace these illustrative values with your own.
| Input or output | Example value |
|---|---|
| Weight (kg) | 70 kg |
| Height (cm) | 170 cm |
| Age | 30 |
| Sex used by the formula | Male |
| Estimated body fat | 19.765744 % |
Understanding the Body Fat result
The main output is estimated body fat, expressed in %. It applies to the inputs and operation you selected.
Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.
Body Fat Calculator: assumptions and common mistakes
A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.
- Population-based estimate with substantial individual error; pregnancy and highly muscular bodies are not well represented.
- Health estimates are context-dependent. Age, pregnancy, illness, medication and individual measurements can affect interpretation; these tools do not diagnose a condition.
For wider guidance, visit World Health Organization. The formula and scope of this specific tool are stated on this page.
