BMI Calculator
Calculate your Body Mass Index instantly. Get your BMI category with a visual gauge and personalized health tips based on your result.
How to Use This Tool
Using the BMI Calculator is straightforward and takes just a few seconds:
- Enter your weight — Toggle between kilograms (kg) and pounds (lbs) using the unit switch.
- Enter your height — Choose centimeters (cm) or feet & inches (ft/in) format.
- Click "Calculate BMI" — Your BMI value, category, visual gauge, healthy weight range, and personalized health tips appear instantly.
- Review your results — The color-coded gauge shows where you fall on the BMI spectrum from underweight to obese.
- Reset — Click "Reset" to clear all inputs and start over.
This calculator uses the standard WHO BMI formula: BMI = weight (kg) ÷ height (m)². It is intended for adults aged 20 and older.
Frequently Asked Questions
What is a healthy BMI range?
A healthy BMI falls between 18.5 and 24.9. Values below 18.5 indicate underweight, 25–29.9 indicate overweight, and 30 or above indicate obesity. Keep in mind that BMI is a screening tool and should be supplemented with other health assessments.
How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by the square of your height in meters: BMI = weight (kg) / height (m)². For imperial units, the formula is: BMI = (weight in pounds × 703) / (height in inches)².
Is BMI accurate for everyone?
BMI is a useful screening tool but doesn't account for muscle mass, bone density, age, or gender. Athletes may have a high BMI due to muscle mass while being very healthy. It's best used alongside other metrics like waist circumference and body fat percentage.
What BMI is considered obese?
A BMI of 30 or higher is classified as obese. BMI 30–34.9 is Class I obesity, 35–39.9 is Class II, and 40+ is Class III (severe or morbid obesity). Each class carries different health risk levels.
Can children use this BMI calculator?
This calculator is designed for adults aged 20 and older. For children and teens (ages 2–19), BMI is calculated differently using age- and sex-specific percentiles. Consult a pediatrician for accurate assessment.
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