BMI Calculator – Body Mass Index Calculator Free Online
Calculate your BMI (Body Mass Index) instantly. Supports metric (kg/cm) and imperial (lbs/ft). See your healthy weight range. Free, no sign-up.
Frequently Asked Questions
BMI (Body Mass Index) is a measure of body fat based on height and weight. It is calculated as weight (kg) divided by height (m) squared. For imperial units: (weight in lbs / height in inches²) × 703.
According to the WHO, a BMI of 18.5–24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.
BMI is a screening tool, not a diagnosis. It may not be accurate for athletes (high muscle mass), elderly people, pregnant women, or children. Different ethnic groups may also have different risk thresholds.
Yes. Switch between metric (kg and cm) and imperial (pounds, feet and inches) using the toggle at the top.
What is BMI Calculator – Body Mass Index Calculator Free Online?
BMI (Body Mass Index) is a numerical value calculated from a person's weight and height. It is used as a screening tool to categorize individuals as underweight, normal weight, overweight, or obese. The formula is: BMI = weight (kg) ÷ height (m)². For imperial units: BMI = (weight in lbs ÷ height in inches²) × 703. Our BMI Calculator supports both metric and imperial units, shows your BMI category with color coding, and displays the healthy weight range for your height. Note that BMI is a screening tool, not a medical diagnosis.
How to Use BMI Calculator – Body Mass Index Calculator Free Online
- 1Select your measurement system: Metric (kg/cm) or Imperial (lbs/ft).
- 2Enter your weight in kilograms (or pounds for imperial).
- 3Enter your height in centimeters (or feet and inches for imperial).
- 4Your BMI is calculated instantly and displayed with your category.
- 5Review the healthy weight range shown for your height.
Key Features
- ✓Supports metric (kg/cm) and imperial (lbs/ft) units
- ✓Instant BMI calculation as you type
- ✓Color-coded BMI categories (Underweight, Normal, Overweight, Obese)
- ✓Visual gauge bar showing your position on the BMI scale
- ✓Healthy weight range displayed for your height
Benefits
- →Quickly assess your weight status relative to your height
- →Track BMI changes over time
- →Understand healthy weight ranges for your body
- →Use as a starting point for health and fitness goals
Why Use Irreva for BMI Calculator – Body Mass Index Calculator Free Online?
Frequently Asked Questions
What is a healthy BMI?
According to the WHO, a BMI of 18.5–24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.
Is BMI accurate for everyone?
BMI is a screening tool, not a diagnosis. It may not be accurate for athletes (high muscle mass), elderly people, pregnant women, or children.
What is the BMI formula?
For metric: BMI = weight (kg) ÷ height (m)². For imperial: BMI = (weight in lbs ÷ height in inches²) × 703.
Does this support both metric and imperial?
Yes. Switch between metric (kg and cm) and imperial (pounds, feet and inches) using the toggle at the top.
Does BMI calculation send my health data anywhere?
No. The BMI formula runs entirely in your browser using JavaScript. Your weight and height values are used only for the on-screen calculation and are never transmitted to any server or stored by Irreva.
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