Body Fat Calculator

Tool Guide

About the Online Body Fat Rate (BFR) Calculator

The online body fat rate (BFR) calculator automatically applies the BMI formula and multiple body-fat calculation methods based on your height, weight, age, and gender data.

It quickly and accurately computes your body fat percentage, letting you monitor your body fat content at any time and scientifically assess health risks.

Body fat rate has multiple calculation methods; this tool uses the BMI-based algorithm derived from height and weight, and the results are for reference only. To measure BMI, you can directly use the BMI (Body Mass Index) calculator.

How to Use the Calculator to Compute Body Fat Rate (BFR)

1. Enter your height, weight, age, and gender: in the tool, enter your height (cm), weight (kg), age (years), and gender (male, female).

2. Calculate the body fat rate: the system automatically computes based on the formula and quickly gives your body fat percentage.

3. View the result: the results page displays your body fat rate, with a table below showing the reference healthy range to help you judge whether you are healthy.

What Is Body Fat Rate (BFR)?

Body fat rate refers to the proportion of fat weight in the body relative to total body weight, also called body fat percentage; it reflects the amount of fat in the body. Obesity increases the risk of various diseases.

For example, high blood pressure, diabetes, and high blood lipids. Women planning to become pregnant should also not ignore the risks of pregnancy complications and difficult labor caused by obesity. Pay attention to body fat rate and develop healthy living habits.

Body Fat Rate Calculation Principles

BMI-Based Calculation

(1) BMI = weight (kg) ÷ (height × height) (m).

(2) Body fat rate: 1.2 × BMI + 0.23 × age - 5.4 - 10.8 × gender (1 for male, 0 for female).

Another Body Fat Rate Method

Adult female body fat rate method

Parameter a = waist (cm) × 0.74

Parameter b = weight (kg) × 0.082 + 34.89

Body fat weight (kg) = a - b

Body fat rate = (total body fat weight ÷ weight) × 100%

Adult male body fat rate method

Parameter a = waist (cm) × 0.74

Parameter b = weight (kg) × 0.082 + 44.74

Body fat weight (kg) = a - b

Body fat rate = (total body fat weight ÷ weight) × 100%.

The normal body fat rate range for adults is 20%-25% for women and 15%-18% for men. If the body fat rate is too high and weight exceeds the normal value by more than 20%, it can be considered obesity.

An athlete's body fat rate can vary by sport. Generally, male athletes are at 7%-15% and female athletes at 12%-25%.

You can refer to the table below for human body fat rates:

Body Fat Rate Calculator FAQ

Is the online body fat rate calculation accurate?

The body fat rate calculator uses a standard BMI-based body fat formula and can provide accurate reference data, but due to individual differences the results are for reference only, and we recommend combining it with a professional physical exam for a comprehensive assessment.

What data is needed to calculate body fat rate?

You only need to provide your height, weight, age, and gender, and the BFR calculator can automatically compute your body fat rate.

Does it support other body fat calculation methods?

Currently this tool mainly calculates body fat rate based on the BMI formula, while also referring to the different methods for adult men and women for comparison, meeting the needs of most users.

Does an abnormal body fat rate indicate a health problem?

A body fat rate outside the normal range may indicate obesity risk. We recommend a comprehensive assessment combined with other health indicators, and consulting a professional doctor.