Checking a health form
A person of 70 kg and 175 cm has a BMI of about 22.9, within the normal range.
Use BMI Calculator
Figures update as you type. Nothing you enter leaves this tab, and no values are stored.
During the latest release check, the calculator returned a BMI of 22.9 for the test inputs used in the browser. The result is presented as a screening calculation, not a medical diagnosis.
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Browse all specialized calculatorsAbout BMI Calculator
A BMI calculator works out your body mass index from your weight and height - a single number that places you in a broad band from underweight to obese. BMI is a quick, standardised screen used everywhere from doctors' offices to insurance forms, and while it is far from a complete picture of health, it is the figure most often asked for. This tool computes it instantly in your browser from metric weight and height. The tool divides your weight in kilograms by your height in metres squared and reports the standard bands: under 18.5 is underweight, 18.5 to 25 normal, 25 to 30 overweight, and 30 or more obese. Its well-known limitation is that it cannot tell muscle from fat - a very muscular person can read as overweight - nor does it account for age, sex or where weight is carried. Treat it as a rough screen and a conversation starter, not a diagnosis.
Using BMI Calculator
- Enter weight in kilograms and height in centimetres.
- The tool converts centimetres to metres and divides weight by height squared.
- Read the BMI number and broad category as a screening result, not a diagnosis.
Where bmi calculator helps
Check the units before interpreting the number
For 70 kg and 175 cm, convert the height to 1.75 m before squaring it: 70 / (1.75 x 1.75) is about 22.86. Entering 175 as metres, or entering a weight in pounds into a kilogram field, changes the result dramatically. Keep the original measurements when comparing records because rounding height before the calculation also changes the ratio. This numerical check does not assess an individual's health.
Before you use the result
- BMI does not distinguish muscle from fat or describe an individual's overall health. Seek clinical advice for a personal assessment.
- It calculates in your browser from the numbers you enter, so a wrong input gives a wrong result - sanity-check the figures.
- Nothing is saved between visits; note down or screenshot the result if you need to keep it.
Questions about BMI Calculator
Is BMI accurate?
It is a rough screen, not a diagnosis. It cannot distinguish muscle from fat or account for age and build, so use it as one indicator alongside others.
Is my data saved or uploaded?
No. BMI Calculator calculates the result entirely in this browser; the values you enter are not stored or sent to a server.
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