Body Mass Index Calculator
What's my BMI
and ideal weight?
Enter your height and weight to calculate your BMI and ideal weight instantly.
🔒 Your inputs never leave your browser — nothing is sent to a server
BMI Ledger
Results update instantly as you type
BMI
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Ideal Weight
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How is BMI calculated?
BMI is calculated as "weight (kg) ÷ height (m)²". Under 18.5 is underweight, 18.5–23 is normal, 23–25 is overweight, and 25+ is classified as obese under common Asian BMI standards.
How is ideal weight calculated?
We use the Broca index variant: for men, "(height-100) × 0.9"; for women, "(height-100) × 0.85".
A note of caution
BMI does not distinguish between muscle and fat mass, so athletes with high muscle mass may show a higher BMI than expected. Use this alongside a body composition analysis for a fuller picture.
Frequently Asked Questions
How accurate is this result?
This is a reference estimate based on commonly used formulas. For a precise health assessment, please consult a medical professional.
Is my data stored or sent anywhere?
No. All calculations happen entirely in your browser. Nothing is sent to a server, and nothing is saved once you close the tab.
Does this work on mobile?
Yes, the layout automatically adapts to your screen size.