Calculate your Body Mass Index (BMI) based on height and weight.
Quick answer
The BMI is 22.9, which is in the normal weight range. BMI is weight in kilograms divided by height in metres squared, and it is a screening number, not a diagnosis.
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Normal weight |
| 25.0 to 29.9 | Overweight |
| 30.0 and above | Obese |
These figures are computed with the same formulas as the BMI Calculator above. Change the inputs in the tool to see your own result. For a full table, see BMI chart for adults.
The BMI Calculator is a free online tool that instantly calculates your Body Mass Index (BMI) based on your weight and height. Enter your measurements to see your BMI value and which category you fall into — underweight, normal weight, overweight, or obese. Supports both metric and imperial units. A quick screening tool for personal health awareness.
Made for everyone. Typical uses:
A person who weighs 70 kg and is 175 cm tall has a BMI of 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 ≈ 22.9, which is Normal weight. At that height the normal range is 56.7 kg to 76.3 kg. In imperial units the same person is about 154 pounds at 69 inches.
BMI doesn't distinguish muscle from fat, so athletes or anyone with a muscular build can register as 'overweight' despite low body fat, and it doesn't account for age, sex, bone density, or where fat is distributed on the body — all of which affect actual health risk.
Accuracy: Formulas follow standard published methods and are checked against worked reference examples. Results are estimates based on the values you enter and do not replace advice from a qualified professional.
Expert Tip
If your BMI reads high but you strength-train regularly, a body fat percentage or waist circumference measurement gives a more accurate picture than BMI alone, since BMI can't tell muscle mass from fat mass.
Body mass index, or BMI, compares your weight with your height using one formula: weight in kilograms divided by height in metres squared. The BMI Calculator does the arithmetic for you. Choose metric to enter kilograms and centimetres, or imperial to enter pounds and inches, press Calculate BMI, and you get the number rounded to one decimal place, the adult category it falls in, and the range of weights that would put you in the normal band at your height.
Take a person who weighs 70 kg and is 175 cm tall. Height in metres is 1.75, and 1.75 squared is 3.0625. Dividing 70 by 3.0625 gives 22.86, which the tool shows as 22.9 and labels Normal weight. The same person in imperial units is about 154 lb at 69 inches, which also comes out at about 22.7. The healthy-range line for 175 cm reads 56.7 kg to 76.3 kg, because 18.5 × 3.0625 is 56.7 and 24.9 × 3.0625 is 76.3. Someone of the same height who weighs 95 kg has a BMI of 29.3, in the overweight range, less than one point below the obese cut-off.
The calculator uses the standard adult ranges published by the World Health Organization and the US Centers for Disease Control and Prevention.
BMI is a screening number, not a diagnosis. It cannot tell muscle from fat, so a strength athlete can fall in the overweight band with very little body fat, while an older person who has lost muscle can have a normal BMI and still carry too much fat. It also ignores where fat is stored, and fat around the waist carries more health risk than fat on the hips. The adult ranges do not apply to children and teenagers, who are assessed against growth charts for their age. Some health bodies also suggest lower action points for people of South and East Asian background, because health risks can rise at a lower BMI. For a fuller picture, pair BMI with the Body Fat Calculator or a waist measurement.
A single reading matters less than the trend. If your result is outside the normal band, treat it as a prompt to talk to a doctor or dietitian, not as a verdict. If you want to plan food intake around a goal, the Calorie Calculator estimates how many calories you need each day, and the Calorie Burn Calculator estimates what an activity uses. To work with weights in other units, the Unit Converter converts kilograms, pounds and stones.
Your height and weight are used only to calculate the result in your browser. Nothing is stored or sent anywhere. The tool needs both values to be numbers greater than zero and tells you if they are not.
Reference table with CSV download.
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