BMI Calculator — Calculate Your Body Mass Index
Your Body Mass Index (BMI) is one of the most widely used health screening measurements in the world. Calculated from just your height and weight, BMI gives you a quick snapshot of whether your weight falls within a healthy range for your height. Use this free BMI calculator to instantly find your BMI, see your weight category, visualize where you fall on the BMI scale, and discover the healthy weight range for your height — in both metric and imperial units.
Your BMI
BMI Scale
Healthy Weight Range for your height
53.5 kg — 72 kg
How to Calculate Your BMI
- Select your preferred unit system — Metric (kg and cm) or Imperial (lbs, feet, and inches)
- Enter your height using the input field or slider
- Enter your weight using the input field or slider
- Your BMI, category, gauge position, and healthy weight range appear instantly — no calculate button needed
BMI Categories Explained
Underweight (BMI below 18.5)
May indicate nutritional deficiency or other underlying health conditions. Consult a doctor.
Normal Weight (BMI 18.5–24.9)
Associated with the lowest health risk for most adults. Maintain through balanced diet and regular exercise.
Overweight (BMI 25–29.9)
Slightly elevated health risk. Small lifestyle changes can help move toward a healthy range.
Obese Class I (BMI 30–34.9)
Moderate health risk. Associated with increased risk of diabetes, heart disease, and other conditions.
Obese Class II (BMI 35–39.9)
High health risk. Medical guidance recommended.
Obese Class III (BMI 40+)
Very high health risk. Medical intervention strongly recommended.
Limitations of BMI
BMI does not distinguish between muscle and fat. Highly muscular individuals like athletes may have a high BMI while being very fit. It also does not account for where fat is distributed on the body, which affects health risk. BMI should be used alongside other measurements like waist circumference and body fat percentage for a more complete picture. Always consult a qualified healthcare professional for a complete health evaluation.
Key Features of This Calculator
- Metric and Imperial unit support with automatic value conversion
- Real-time BMI calculation — updates as you type
- Visual BMI gauge with animated pointer
- BMI category with color-coded display
- Healthy weight range for your height
- Copy result to clipboard
- Works on all devices including mobile
- 100% free — no signup, no account needed
Privacy Notice
This BMI calculator runs entirely in your browser. No health data you enter is sent to any server or stored anywhere. Your information remains completely private.
Frequently Asked Questions
What is BMI?
BMI or Body Mass Index is a numerical value calculated from your height and weight. It is used as a screening tool to categorize weight status into underweight, normal weight, overweight, or obese.
How is BMI calculated?
BMI is calculated by dividing your weight in kilograms by your height in meters squared. Formula: BMI = weight(kg) / height(m)². For imperial units: BMI = (weight(lbs) × 703) / height(inches)².
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered normal or healthy weight for adults. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is considered obese.
Is BMI accurate?
BMI is a useful screening tool but it has limitations. It does not account for muscle mass, bone density, age, or gender differences. Athletes may have a high BMI despite being very healthy. Always consult a healthcare professional for a complete health assessment.
Does this BMI calculator support metric and imperial units?
Yes. The calculator supports both metric units (kg and cm) and imperial units (lbs, feet, and inches). You can switch between unit systems at any time and your values will be automatically converted.
Is this BMI calculator free?
Yes, completely free. No account, no signup, and no payment required. The calculator runs entirely in your browser.
Is this BMI calculator suitable for children?
This calculator is designed for adults aged 18 and above. BMI interpretation for children and teenagers requires age and gender-specific charts which differ from adult BMI categories.
What is the healthy weight range for my height?
Your healthy weight range is the weight range that corresponds to a BMI of 18.5 to 24.9 for your height. The calculator displays this range automatically once you enter your height.
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