BMI Calculator

Use our free BMI Calculator to estimate your Body Mass Index based on your weight in pounds and height in feet and inches. This tool helps you understand whether your BMI falls within the underweight, normal, overweight, or obese range.

Weight (lbs): Height:

How the BMI Calculator Works

A BMI Calculator estimates Body Mass Index using your weight and height. BMI is a common screening tool used to classify whether a person is underweight, normal weight, overweight, or obese. It does not directly measure body fat, but it provides a useful general health indicator.

You may also want to try our Weight Converter Calculator.

BMI Categories

Underweight: BMI below 18.5
Normal weight: BMI 18.5 – 24.9
Overweight: BMI 25 – 29.9
Obesity: BMI 30 and above

Example Calculation

Let’s say your weight is 150 pounds and your height is 5 feet 6 inches.

First, convert height to inches:
5 × 12 + 6 = 66 inches

Then use the BMI formula:

BMI = (Weight ÷ Height²) × 703
BMI = (150 ÷ 66²) × 703
BMI ≈ 24.2

This means your BMI is approximately 24.2, which falls within the normal weight range.

Real-Life Uses

A BMI calculator is useful in many real-world situations:

Checking if your weight is in a healthy range
Tracking fitness and weight loss progress
Planning diet and exercise routines
Health screenings and medical checkups
Setting personal wellness goals

Tips

Measure your height and weight accurately
Use consistent units (pounds/inches or kg/meters)
Track your BMI over time for better insights
Combine BMI with other health indicators for a full picture
Use this calculator regularly to monitor changes

Common Mistakes to Avoid

Entering incorrect height or weight
Mixing units (e.g., kg with inches)
Relying only on BMI without considering muscle mass
Forgetting that BMI is a general guideline, not a diagnosis
Not updating your measurements regularly

BMI Calculator FQAs

What is BMI?

BMI stands for Body Mass Index. It is a number calculated from your weight and height to estimate whether your body weight is in a healthy range. To get a more detailed estimate of body composition, you can use our Body Fat Calculator.

Is BMI accurate for everyone?

BMI is a useful general guideline, but it may not be accurate for athletes, older adults, or people with high muscle mass because it does not directly measure body composition. You can also use our Calorie Calculator to estimate your daily calorie needs.

What is a healthy BMI?

For most adults, a BMI between 18.5 and 24.9 is considered a healthy range.

Can BMI diagnose health problems?

No. BMI is only a screening tool. It should not be used alone to diagnose medical conditions

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