How to Calculate Body Mass Index (BMI)

Calculate your Body mass index (BMI): BMI is a measure of body fat based on height and weight that applies to adult men and women. BMI Calculator for men and women.

You can calculate Body Mass Index (BMI) by using these formulas.

• BMI Standard Formula
• BMI Metric Formula

BMI Standard Formula:

The formula is BMI = (703 × lbs)/in² where lbs is a person’s weight in pounds and in² is their height in inches squared.

BMI Metric Formula:

The formula is BMI = kg/m² where kg is a person’s weight in kilograms and m² is their height in metres squared.

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Calculate BMI with Standard Formula:

The Body Mass Index (BMI) is calculated using the following formula:

• BMI = (703 x lbs)/in² 

Step-by-Step guide to calculate BMI using the standard formula:

1) Step: Gather Information

• Obtain your weight in Pounds(lbs).
• Measure your height in Inches (in).

Convert weight between kg & lbs here

2) Step: Square the Height

Square your height by multiplying it by itself.

• Height squared = Height in inches × Height in inches

Feet, inches & centimeters Converter

3) Step: Apply the BMI Standard Formula

• Use the Standard BMI formula to calculate your BMI.

4) Step: Interpret the Result

• Compare your calculated BMI with BMI categories:
  • Underweight: BMI less than 18.5
  • Normal weight: BMI between 18.5 and 24.9
  • Overweight: BMI between 25 and 29.9
  • Obesity: BMI of 30 or greater

BMI Calculation Example:

1. Let’s say your weight is $150\text{pounds}$ and your height is 65 inches.

1) Gather Information

• Weight = 150 pounds
• Height = 65 inches

2) Square the Height

• Height squared = 65 × 65 = 4225

3) Apply the BMI Formula

• BMI = (150 × 703)/4225
• BMI = 25

4) Interpret the Result

• The calculated BMI is approximately 25.0.
• This falls within the “Overweight” category.

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Calculate BMI with Metric Formula:

Certainly! The Body Mass Index (BMI) is calculated using the following formula:

• BMI = kg/m² 

Step-by-Step guide to calculate BMI using the Metric formula:

1) Step: Gather Information

• Obtain your weight in kilograms.
• Measure your height in meters.

Click here to convert weight between kg & lbs

2) Step: Square the Height

• Square your height by multiplying it by itself.
• Height squared = Height in meters × Height in meters

Feet, inches & centimeters Converter

3) Step: Apply the BMI Formula

• Use the BMI formula to calculate your BMI.

4) Step: Interpret the Result

• Compare your calculated BMI to standard BMI categories:
  • Underweight: BMI less than 18.5
  • Normal weight: BMI between 18.5 and 24.9
  • Overweight: BMI between 25 and 29.9
  • Obesity: BMI of 30 or greater

BMI Calculation Example:

Let’s say your weight is 70 kg and your height is 1.75 meters.

1) Gather Information

• Weight = 70 kg
• Height = 1.75 meters

2) Square the Height

• Height squared= 1.75 × 1.75 = 3.0625

3) Apply the BMI Formula

• BMI = 70/3.0625
• BMI =  22.84

4) Interpret the Result

• The calculated BMI is approximately 22.84.
• This falls within the “Normal weight” category.

Note: Remember that BMI is a screening tool and doesn’t account for muscle mass or fat distribution. It is advisable to consult with a healthcare professional for a more comprehensive assessment of your health.

BMI Limitations

• Older adults tend to have more body fat than younger adults with the same BMI.
• Women tend to have more body fat than men for an equivalent BMI.
• Muscular individuals and highly trained athletes may have higher BMIs due to large muscle mass.

Frequently Asked Questions (FAQs)