BMI Calculator
Body Mass Index (BMI) is a screening measure that uses your height and weight to categorize weight status. This calculator supports metric (kg/cm) units.
- BMI
- 22.9
Try an example
Formula
BMI = weight(kg) / height(m)²
Learn How This Works
Understanding Your Health Numbers: BMI, BMR, and Body Composition Explained
What BMI, BMR, and body fat percentage formulas actually measure, their limitations, and how to interpret your results.
What BMI Actually Measures (and What It Doesn't)
The BMI formula explained with a worked example, its historical origin, and why it shouldn't be read in isolation.
How the U.S. Navy Body Fat Method Actually Works
The circumference-based body fat formula explained, including why it uses logarithms and how accurate it really is.
How Blood Pressure Categories and Waist-to-Hip Ratio Are Determined
The AHA blood pressure classification chart and the waist-to-hip ratio formula explained with real readings.
Body Surface Area and Daily Water Intake: The Formulas Explained
The Mosteller body surface area formula and the weight-based water intake guideline, explained with real numbers.
Blood Alcohol Estimation and Daily Sugar Limits Explained
The Widmark BAC formula and the AHA added-sugar guideline explained with real worked examples.
Pediatric BMI and Kidney Function (eGFR) Explained
Why children's BMI needs percentile charts instead of adult cutoffs, and how the eGFR kidney function formula works.
Understanding Your Blood Pressure and Heart Health Numbers Together
How blood pressure category, BMI, and heart rate zones fit together as a basic personal health dashboard.
Frequently Asked Questions
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Estimate how much water you should drink per day based on your weight.