BMI Calculator
Get a complete health overview from your height and weight. Add age, sex and activity level to see BMR + TDEE + 5 calorie targets. Optionally enter waist/hip/neck for waist-to-hip ratio and body-fat % (US Navy formula).
All calculations happen in your browser. No data is sent to a server.
These metrics are general indicators and not medical diagnoses. Consult a healthcare professional for medical advice.
How to use this bmi calculator
- Choose metric or imperial units and enter your height and weight.
- Add age, sex and activity level for BMR + TDEE + calorie targets.
- Optionally add waist, hip and neck measurements for body composition.
- Review BMI, BMI Prime, healthy weight range, ideal weight, daily calorie targets, water intake, waist-to-hip ratio and body-fat percentage.
Frequently asked questions
What is BMR vs TDEE?
BMR (basal metabolic rate) is calories burned at rest. TDEE multiplies BMR by an activity factor (1.2 sedentary → 1.9 very active) for total daily calorie burn.
How is body fat % calculated?
Using the US Navy formula: from height + waist + neck (and hip for women). It's an estimate accurate to ~3% for most people.
What is BMI Prime?
BMI divided by 25. Above 1.0 indicates overweight; under 0.74 indicates underweight. Quick way to see distance from healthy range.
Is my data sent to a server?
No. All calculations happen in your browser. Nothing is uploaded.