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BMI Calculator

Enter your height and weight, and the calculator will show your BMI, WHO category, and the healthy weight range for your height.

Enter your details and your results will appear here.

How to calculate BMI

BMI, or body mass index, is calculated as follows: weight in kilograms divided by height in meters squared.

Example: 70 kg and 175 cm → 70 ÷ (1.75 × 1.75) = 70 ÷ 3.06 = 22.9. This is in the healthy range.

The calculator does this for you and shows right away which range you fall into and what the healthy weight range is for your height.

BMI chart according to WHO

BMI Category
below 18.5 underweight
18.5-24.9 healthy weight
25-29.9 overweight
30-34.9 class I obesity
35-39.9 class II obesity
40 and above class III obesity

These ranges apply to adults. For children and teens, BMI is assessed using growth charts that account for age and sex, so this adult calculator isn't suitable.

Healthy weight for your height

The healthy BMI range (18.5-24.9) expressed in kilograms:

Height Healthy weight
150 cm about 41.6-56.0 kg
155 cm about 44.4-59.8 kg
160 cm about 47.4-63.7 kg
165 cm about 50.4-67.8 kg
170 cm about 53.5-72.0 kg
175 cm about 56.7-76.3 kg
180 cm about 59.9-80.7 kg
185 cm about 63.3-85.2 kg
190 cm about 66.8-89.9 kg
195 cm about 70.3-94.7 kg

When can BMI be misleading?

BMI is a quick and simple measure, but it doesn't show what your body is made up of. It can be misleading if:

  • you have a lot of muscle - someone who strength trains may be classified as “overweight” according to BMI despite having a low body fat level,
  • you're older - muscle mass decreases with age, so a healthy BMI can hide excess body fat,
  • you're pregnant - during pregnancy, your pre-pregnancy BMI and your doctor's recommendations are what matter,
  • it's a child or teen - growth charts are used in these cases.

Waist circumference is a useful additional measure. According to WHO, the risk of obesity-related diseases increases above about 80 cm for women and 94 cm for men, and rises considerably above 88 cm and 102 cm, respectively. You can also use body measurements to calculate your body fat percentage with the body fat calculator, and check an estimated weight for your height with the ideal weight calculator.

What should you do with your result?

  • BMI in the healthy range? Great. If you want to maintain your weight, check your daily calorie needs.
  • Overweight or obesity? Take it one step at a time, without crash diets. Start with a moderate calorie deficit, which you can calculate with the calorie deficit calculator. Losing just 5-10% of your body weight already significantly improves many health markers.
  • Underweight? Consider talking to a doctor or dietitian, especially if your weight is dropping for no clear reason.

In EatSee, you can log your weight and see its trend and forecast, making it easier to tell whether you're moving in the right direction. Read more about how to lose weight without crash dieting in our article about calorie deficits.

FAQs

What is a healthy BMI?
For adults, a BMI from 18.5 to 24.9 is considered healthy. A result from 25 to 29.9 indicates overweight, and 30 or higher indicates obesity.
How can I calculate BMI myself?
Divide your weight in kilograms by your height in meters squared. Example: 70 kg and 1.75 m gives 70 ÷ 3.06, or a BMI of about 22.9.
Is BMI the same for women and men?
Yes. The same BMI ranges apply to adults regardless of sex. However, women usually have more body fat than men at the same BMI.
Does BMI work for people who do strength training?
Less reliably. BMI doesn't distinguish muscle from fat, so someone with a lot of muscle may fall into the overweight range despite having a low body fat level. In that case, it's also better to consider waist circumference.
Is the BMI calculator for children?
No. For children and teens, BMI is assessed using growth charts that account for age and sex. It's best to discuss the result with a pediatrician.

This calculator is for informational purposes only and does not replace advice from a doctor or dietitian. The calculations happen in your browser—we don’t send the data you enter anywhere. We only save it in this tab for the duration of your visit, so it can be filled in automatically in other calculators. Formulas and sources.

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