Free Online BMI Calculator
Calculate your Body Mass Index (BMI) to understand your weight status. Our BMI calculator supports both Metric (kg, cm) and Imperial (lbs, ft, in) units and provides standard BMI categories.
What is BMI (Body Mass Index)?
Body Mass Index (BMI) is a value derived from the mass (weight) and height of an individual. It is a widely used, inexpensive, and easy screening method for weight categories that may lead to health problems. BMI does not measure body fat directly, but it is moderately correlated with more direct measures of body fat. It is calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m²).
Why Use Our Free Online BMI Calculator?
- Quick Health Indicator: Get an immediate estimate of your weight status according to standard BMI categories.
- Supports Metric & Imperial: Easily switch between kilograms/centimeters and pounds/feet/inches.
- Clear Results: Displays your BMI value and the corresponding weight category (e.g., Underweight, Normal, Overweight, Obesity).
- Understand BMI Ranges: Includes a reference table for standard BMI classifications by the World Health Organization (WHO).
- User-Friendly: Simple input fields and clear calculation.
- Free and Accessible: Calculate your BMI anytime, anywhere, without cost.
- Downloadable Summary: Save your BMI calculation results for personal tracking.
How to Use the BMI Calculator
- Select Units: Choose whether you want to enter your measurements in Metric (kilograms and centimeters) or Imperial (pounds, feet, and inches) units using the radio buttons.
- Enter Your Weight: Input your current weight in the appropriate field (kg or lbs).
- Enter Your Height:
- If using Metric, enter your height in centimeters (cm).
- If using Imperial, enter your height in feet (ft) and inches (in).
- Calculate BMI: Click the "Calculate BMI" button.
- View Results: The calculator will display:
- Your calculated BMI value (rounded to one decimal place).
- Your BMI category based on WHO classifications (e.g., "Normal weight").
- A reference table of BMI categories will also be visible.
- Download Report (Optional): Click the "Download BMI Report" button to save a summary of your inputs and results.
Disclaimer: BMI is a screening tool and does not diagnose body fatness or an individual's health. Factors like age, sex, ethnicity, and muscle mass can influence the relationship between BMI and body fat. Consult with a healthcare provider for a comprehensive assessment of your health status and weight.
Take a Step Towards Understanding Your Health!
While BMI is not the sole indicator of health, it's a useful starting point for assessing your weight status. Use SK Multi Tools' Free Online BMI Calculator to get your number and then discuss your results and overall health with a healthcare professional.