BMI Calculator
Calculate Body Mass Index (BMI) from height and weight in metric or imperial units. Get category (underweight / normal / overweight / obese), healthy weight range, and 10+ extras. 100% private.
About BMI Calculator
Calculate Body Mass Index (BMI) from height and weight in metric or imperial units. Get category (underweight / normal / overweight / obese), healthy weight range, and 10+ extras. 100% private. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
What is BMI?
Body Mass Index (BMI) is a person's weight in kilograms divided by the square of their height in meters. It's a screening tool for weight categories: underweight (<18.5), normal (18.5-24.9), overweight (25-29.9), obese (>=30).
Is BMI accurate for everyone?
BMI is a population-level screening tool, not a diagnostic of body fat or health. It overestimates fat in muscular athletes and underestimates fat in older adults who've lost muscle. Always consult a doctor for individual health assessments.
What extra features does this tool have compared to others?
Extras: (1) Healthy weight range, (2) BMI Prime, (3) Body surface area (Mosteller), (4) Ponderal Index, (5) Basal Metabolic Rate (Mifflin-St Jeor), (6) Daily calorie needs (5 activity levels), (7) Weight loss/gain goal calculator, (8) BMI z-score for age 2-20 (approximation), (9) CSV export of weight scenarios, (10) Dark/light metric/imperial toggle, (11) Macro nutrient split suggestions, (12) Waist-to-height ratio estimator.
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