Body Mass Index (BMI), Body Fat and Basal Metabolic Rate (BMR) Calculator
Free Body Mass Index Calculator (BMI), Body Fat (BF) and Basal Metabolic Rate (BMR) Calculator. In standard and metric version (kg and cm). Calculate your BMI, BF and BMR with age, gender, weight and height. It tells you when your BMI is too low, too high or if it is OK.
A BMI between 20 and 25 is considered healthy. If it’s lower than 20 than you might be underweight and above 25 suggests that you are obese. If you are a bodybuilder and you have more muscle mass than normal, the outcome is probably higher than it actually is, due to muscle mass. If you are calculating the BMI for a child you can check this in the graphs published below the BMI-calculator. Standard version: calculate BMI with pounds and feet.
Metric version: If you want to calculate your BMI with bodyweight in kg and length in cm, click on the link below the title of the BMI-calculator.
What is the Body Mass Index (BMI)?
The body mass index (BMI), or Quetelet index, is to approximate the amount of fat for humans based on an individual’s weight and height:
BMI = (mass (kg) / (height (m))²)
BMI does not actually measure the percentage of body fat. Formula used to calculated body fat %:
Body Fat (%) = = (1.20 × BMI) + (0.23 × Age) − (10.8 × gender) − 5.4
where gender is 1 for males and 0 for females.
What is the Basal Metabolic Rate (BMR)?
Basal Metabolic Rate (BMR) is the amount of daily energy expended by humans at rest. In other words: if you lay in bed all day, this is the amount of energy what your body will burn. The calculator uses the following formula to calculate this:
BMR (kcal) = 370 + (21.6 * Lean Body Mass (kg))
Where Lean Body Mass (kg) = Body Mass (kg) – Body Fat (kg)
Body Mass Index for children
If you are calculating the BMI for a child you can check this in the following graphs. Start look at the age (2 – 20 years old) then go up to the calculated BMI. If it’s below the 25th line the child might be underweight and above the 75th suggests that the child is obese.
Click on the graphs to see them larger.
If you want this BMI-calculator on your website, feel free to contact me.
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