Not medical advice. This tool gives general information, not medical advice. Speak to a doctor or a qualified health professional before changing your diet, sleep or exercise — particularly if you are pregnant, taking medication, or managing a health condition. Full disclaimer.
Precision · Instant · Private
BMI Calculator
Find your Body Mass Index from your height and weight, in metric or imperial units. See your category and healthy weight range instantly.
SYSTEM ● ONLINE · LOCAL COMPUTE · ZERO UPLOAD
UNIT // BMI.CALCLIVE
Units
Your BMI
22.9
Normal weight
22.9
BMI
Normal
Category
57–76kg
Healthy range
Quick Answer
How is BMI calculated?
// Answer
BMI is your weight in kilograms divided by your height in metres squared: BMI = kg ÷ m². For example, 70 kg at 1.75 m is 70 ÷ (1.75 × 1.75) = 22.9. In imperial units, BMI = (pounds ÷ inches²) × 703.
Body Mass Index is a quick screening number that estimates whether your weight is in a healthy range for your height. It is widely used because it needs only two easy measurements, though it does not directly measure body fat.
BMI categories for adults
Category
BMI range
Underweight
Below 18.5
Normal weight
18.5 – 24.9
Overweight
25.0 – 29.9
Obesity
30.0 and above
These ranges apply to adults aged 20 and over. Children and teens are assessed against growth charts for their age and sex. A WHO expert consultation kept these cut-offs as the international standard but noted that, in many Asian populations, risk of type 2 diabetes and heart disease is already raised below 25, and proposed extra public-health action points at 23 and 27.5.
Why use this tool
A private health check
This BMI calculator runs entirely on your device — your height and weight are never uploaded. BMI is a useful starting point, but it does not account for muscle mass, bone density, or body composition, so treat it as one signal among many and consult a healthcare professional for personalised advice.
FAQ
Frequently asked questions
For adults aged 20 and over, a BMI from 18.5 up to 25 is classed as a healthy weight by the WHO and the CDC. Children and teens are assessed differently, by age and sex, and a WHO expert consultation found that many Asian populations show higher health risk below 25.
Divide your weight in pounds by your height in inches squared, then multiply by 703.
BMI is a useful general screening tool but does not measure body fat directly, so it can be misleading for athletes with high muscle mass or for older adults.
Yes. All calculations happen in your browser and nothing you enter is uploaded or stored on a server.