⚖️BMI Calculator
Find your Body Mass Index and weight category.
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About this calculator
Body Mass Index (BMI) is a simple screening number that relates your weight to your height. It's widely used to put adults into broad categories — underweight, normal weight, overweight or obese. BMI doesn't measure body fat directly and doesn't account for muscle mass, so very muscular people may read as 'overweight' despite being healthy. Treat it as a quick guide, not a diagnosis.
Formula
BMI = weight (kg) ÷ height (m)². Categories: under 18.5 = underweight, 18.5–24.9 = normal, 25–29.9 = overweight, 30+ = obese.
How to use
Enter your Weight (kg), Height (cm) above — the result updates instantly as you type or drag the sliders. It's free and needs no sign-up.
Frequently Asked Questions
What does the BMI Calculator do? ▼
Find your Body Mass Index and weight category.
How do I use the BMI Calculator? ▼
Enter your values using the input fields or sliders. The result updates instantly — no submit button needed. All calculations run in your browser.
How accurate is the BMI Calculator? ▼
The BMI Calculator uses standard mathematical formulas and the inputs you provide. Results are estimates meant to guide decisions — consult a qualified professional for advice specific to your situation.
Who should use the BMI Calculator? ▼
The BMI Calculator is designed for healthy adults as a general guide. Results may not apply to children, pregnant people, athletes, or those with specific medical conditions.
Should I consult a professional about my BMI Calculator results? ▼
The BMI Calculator is for general information and self-education only. For medical, health, or treatment decisions, always consult a qualified doctor or healthcare professional.
Is the BMI Calculator free? ▼
Yes — completely free. No sign-up, no download, and no account required. Works in any browser.
Is BMI accurate for everyone? ▼
BMI is a useful population-level guide but doesn't distinguish muscle from fat, or account for age, sex and body composition. Athletes and older adults are common exceptions.
What is a healthy BMI range? ▼
For most adults a BMI between 18.5 and 24.9 is considered the healthy range. Use the Body Fat or Lean Body Mass calculators for a fuller picture.