Health & Fitness
BMI Calculator
BMI = weight(kg) / height(m)². Categories: underweight / normal / overweight / obese.
Educational estimates only. Not medical, legal, tax, or financial advice.
Guide: BMI Calculator
What it does
Estimates body mass index (BMI), a common screening ratio of weight to height used in public health and fitness contexts.
How to use it
Enter your weight in kilograms and height in meters, then run the calculation. Adjust inputs anytime; results update on change.
Formula
BMI = weight (kg) ÷ height (m)².
Example
70 kg and 1.75 m → BMI = 70 ÷ (1.75 × 1.75) ≈ 22.9, typically labeled “normal” on standard adult cutoffs.
FAQs
Is BMI accurate for everyone?
BMI is a population screening tool. It may misclassify very muscular people or miss risk in some older adults. Use a clinician for personal health decisions.
Why meters and kilograms?
This calculator uses metric units for consistency with the standard BMI formula. Convert imperial units before entering if needed.
Does this tool store my data?
No. Runs in your browser session; nothing is sent to a server for calculation.
What are typical BMI categories?
Common adult cutoffs: under 18.5 underweight; 18.5–24.9 normal; 25–29.9 overweight; 30+ obese (varies by guideline).