Enter the total body weight (lbs) and the fat weight (lbs) into the Body to Fat Ratio Calculator. The calculator will evaluate and display the Body to Fat Ratio. 

Body to Fat Ratio Formula

The following formula is used to calculate the Body to Fat Ratio. 

BFR = BW / F
  • Where BFR is the Body to Fat Ratio
  • BW is the total body weight (lbs) 
  • F is the fat weight (lbs) 

To calculate the body-to-fat ratio, divide the total body weight by the total fat weight.

How to Calculate Body to Fat Ratio?

The following example problems outline how to calculate Body to Fat Ratio.

Example Problem #1:

  1. First, determine the total body weight (lbs).
    • The total body weight (lbs) is given as: 160.
  2. Next, determine the fat weight (lbs).
    • The fat weight (lbs) is provided as: 40.
  3. Finally, calculate the Body to Fat Ratio using the equation above: 

BFR = BW / F

The values given above are inserted into the equation below and the solution is calculated:

BFR = 160 / 40 = 4.00:1


What is the significance of knowing your Body to Fat Ratio?

Knowing your Body to Fat Ratio is crucial for understanding your overall health and fitness level. It helps in assessing the risk for certain diseases related to obesity, such as heart disease, diabetes, and hypertension. Additionally, it can guide individuals in setting realistic fitness goals and monitoring progress in weight loss or muscle building programs.

Can the Body to Fat Ratio vary by age and gender?

Yes, the Body to Fat Ratio can vary significantly by age and gender. Generally, women have a higher body fat percentage than men due to physiological differences. As people age, their body composition may change, often leading to an increase in fat mass and a decrease in muscle mass. Therefore, age and gender-specific charts or calculators should be used for a more accurate assessment.

How often should I calculate my Body to Fat Ratio?

The frequency of calculating your Body to Fat Ratio depends on your health and fitness goals. If you are actively trying to lose weight or gain muscle, you might calculate it every month to track your progress. For general health monitoring, calculating it every 3 to 6 months could be sufficient. However, it’s important to focus on overall health and not just numbers, so consulting with a healthcare professional for personalized advice is recommended.