BMI Calculator
HEALTH
Body Mass Index (BMI) remains one of the most widely used tools for determining whether your weight falls within a healthy range relative to your height. Our BMI calculator is simple and visually engaging, allowing you to assess your health status with instant insights.
A Comprehensive BMI Calculator:
The calculator features a clean, modern interface with intuitive inputs for weight, height, gender, and optional age. Unlike many online tools, our calculator offers both metric (kg/cm) and imperial (lb/in) units with a simple toggle switch. After entering your details, you'll see a marker move in a color spectrum BMI chart, making it easy to understand your health status, where your health falls: Underweight, Normal, Overweight, Obese I, and Obese II.
Using the calculator is straightforward:
Select your preferred measurement system
Enter your weight and height
Choose your gender (male or female)
Add your age if desired
Click "Calculate BMI"
Your results display your BMI value, and a color-coded category label immediately signals whether your BMI falls within healthy parameters. The visual BMI chart serves as an educational tool, helping users understand the spectrum of weight categories. Each color represents a different classification:
Blue for Underweight
Green for Normal
Yellow for Overweight
Orange for Obese I
Red for Obese II
This color-coding system helps users quickly grasp where their result falls in relation to health guidelines.
While BMI is a valuable screening tool, it's important to understand its limitations. BMI doesn't distinguish between muscle mass and fat mass, which means athletes with high muscle density may register as overweight despite being healthy. Similarly, it doesn't account for fat distribution, which significantly impacts health risks. The calculator includes clear disclaimers about these limitations to encourage informed interpretation.
BMI Formulas: Metric and Imperial Calculations
Body Mass Index (BMI) provides a simple numeric measure of body fat based on height and weight. Here's how BMI is calculated in both measurement systems:
For metric measurements, use this formula:
BMI = weight (kg) / [height (m)]²
Steps:
Convert height from cm to meters (divide by 100)
Square the height value
Divide weight by squared height
Example:
For a person who is 175 cm tall and weighs 68 kg:
Height in meters: 175/100 = 1.75m
Height squared: 1.75 × 1.75 = 3.0625
BMI: 68 ÷ 3.0625 = 22.2 (Normal weight)
For imperial measurements, use this formula:
BMI = [weight (lb) / height (in²)] × 703
Steps:
Square the height in inches
Divide weight by squared height
Multiply by 703
Example:
For a person who is 5'9" (69 inches) tall and weighs 160 lbs:
Height squared: 69 × 69 = 4,761
Weight/height²: 160 ÷ 4,761 ≈ 0.0336
BMI: 0.0336 × 703 = 23.6 (Normal weight)
Why Two Formulas?
The 703 conversion factor in the imperial formula standardizes units since:
1 lb = 0.4536 kg
1 in = 0.0254 m
The constant ensures both systems produce identical BMI values for the same physical proportions.
Interpreting Results
Use this classification for adults:
Underweight: < 18.5
Normal: 18.5 - 24.9
Overweight: 25 - 29.9
Obese Class I: 30 - 34.9
Obese Class II: ≥ 35
Important Considerations
BMI doesn't distinguish between muscle and fat
Athletes may show "overweight" BMI despite low body fat
Not suitable for children or pregnant women
Waist-to-hip ratio provides complementary data
While BMI offers a useful screening tool, always consult healthcare professionals for comprehensive health assessments. Body composition, medical history, and lifestyle factors provide crucial context beyond BMI numbers.
If you find any error or have a request, feel free to Contact.