BMI Calculator — Body Mass Index & Health
Calculate BMI, BMR, TDEE, and ideal weight. Free, private, instant results.
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About the BMI Calculator — Body Mass Index & Health
Calculate Body Mass Index (BMI) online for free.
BMI gives a quick, widely-used snapshot of weight-related health risks.
How to use the BMI Calculator — Body Mass Index & Health
- Enter your height and weight.
- View your BMI and category.
- See health recommendations.
Frequently asked questions
How accurate is BMI?
BMI is a general screening tool and may not account for muscle mass, bone density, age, and other factors. Athletes may have higher BMI due to muscle mass. Use BMI as one indicator alongside other health metrics.
What formula do you use for BMR?
We use the Mifflin-St Jeor equation, which is considered the most accurate formula for calculating BMR. It takes into account weight, height, age, and gender.
How do I use the calorie goals?
To lose weight, aim for the "Lose Weight" calorie target (typically 500 calories below TDEE). To maintain, eat at your TDEE. To gain weight, aim for the "Gain Weight" target (typically 500 calories above TDEE). Always consult a healthcare provider for personalized advice.
Is this calculator private?
Yes! All calculations happen entirely in your browser. No data is sent to our servers or stored anywhere. Your health information stays completely private.
Guides
- BMI Calculator — What It Measures and What It Means
A BMI calculator uses height and weight to estimate body mass index. Learn what the numbers mean, how to interpret the result, and when BMI is useful.
- How to Calculate BMI (Complete Guide)
Learn how to calculate your Body Mass Index (BMI). A practical guide to understanding BMI categories and what they mean for your health.