BMI Calculator
Calculate your Body Mass Index instantly with support for both metric (kg/cm) and imperial (lb/in) units. Get your BMI score, weight category, and healthy weight range in seconds — no account needed.
How to Use the BMI Calculator
- Choose your unit system: Metric (kg and cm) or Imperial (lb and inches).
- Enter your weight and height in the respective fields.
- Click "Calculate BMI" to instantly see your BMI score, weight category, and healthy weight range.
Features
- Supports both metric (kg/cm) and imperial (lb/in) units
- Instant BMI score with one decimal precision
- Weight category: Underweight, Normal, Overweight, or Obese
- Healthy weight range displayed for your height
- Visual BMI scale with marker showing your position
- No data is sent to a server — all calculations in browser
BMI Calculator: practical uses
Use BMI Calculator when you need a fast, clear, private result without creating an account. This page also supports related needs like BMI Calculator online, BMI Calculator formula, BMI Calculator example so you can choose the right workflow.
When it helps
- Best for: Getting a quick answer while still seeing the formula, assumptions, and examples behind the number.
- Helpful details: Enter realistic values, compare scenarios, and use the explanation to understand what changed the final result.
- Next step: Try a related calculator when the same decision needs percentages, prices, loans, tax, tips, age, or health estimates.
For the next step, try Percentage Calculator, Discount Calculator, Tip Calculator, Loan & EMI Calculator.
Frequently Asked Questions
What is BMI and how is it calculated?
BMI (Body Mass Index) is a measure of body fat based on your weight and height. The formula is: BMI = weight (kg) ÷ height² (m²). For imperial units, the tool converts your values to metric before calculating.
What are the BMI categories?
The standard BMI categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). These ranges are defined by the World Health Organization.
Is BMI an accurate measure of health?
BMI is a useful screening tool but does not directly measure body fat. Athletes may have a high BMI due to muscle mass, while older adults may have a normal BMI with a high body fat percentage. Always consult a healthcare professional for a comprehensive health assessment.
How does the healthy weight range work?
The healthy weight range shown is the weight range that corresponds to a BMI between 18.5 and 24.9 for your specific height. It is displayed in the same units you selected (kg or lb).
Can children use this BMI calculator?
This calculator uses standard adult BMI thresholds. BMI for children and teens is interpreted differently using age- and sex-specific percentiles. For anyone under 18, please use a pediatric BMI calculator or consult a doctor.
