What is my BMI if I weigh 70 kg and I am 175 cm tall?
22.9. The calculator turns 175 cm into 1.75 meters, squares it to 3.0625, and divides 70 by that. The result lands in the normal weight band, which runs from 18.5 up to 25.
How is BMI calculated?
Weight in kilograms divided by height in meters squared. That is the whole formula. This tool takes your height in centimeters, divides by 100 to get meters, squares it, and divides your weight by the result, then rounds to one decimal place.
What is a healthy BMI?
The normal weight band runs from 18.5 up to 25, and this tool labels anything in that range Normal weight. It is a band and not a target: plenty of healthy people sit near either edge of it, and the band says nothing about how much of your weight is muscle.
What BMI is considered overweight?
25 up to just under 30 prints as Overweight here. A BMI of exactly 25.0 reads as Overweight, because the boundary belongs to the higher band. At 175 cm, that boundary is about 76.6 kg.
What BMI counts as obese?
30 and above. At 180 cm that is roughly 97.2 kg, so 100 kg at 180 cm gives 30.9 and prints Obese. The label is a statistical category and not a clinical assessment of any individual.
Is BMI different for men and women?
The adult bands are the same for both, which is why this calculator has no sex field. Men and women do differ in average body composition at the same BMI, and that difference is one of the reasons the index is a blunt instrument for individuals.
Why does BMI say I am overweight when I am clearly not?
Because BMI is a ratio of mass to height and knows nothing about what the mass is made of. Muscle is denser than fat, so a well-trained body carries more kilograms per centimeter. This is the single most common and best-documented failure mode of the index.
Can I use this for a child?
No. Children and teenagers are assessed with BMI-for-age percentiles, which compare the value against a growth reference for their exact age and sex. The fixed adult bands here will mislabel them.
Does it accept pounds and feet?
No. The two fields are kilograms and centimeters. Convert first if your scale reads in pounds: divide pounds by 2.205, and multiply feet by 30.48 then add 2.54 per inch.
Why does my BMI show as 22 with no decimal?
The result is rounded to one decimal place and trailing zeros are dropped, so a BMI of 22.0 displays as 22. Nothing about the calculation changes, it is only how the number is printed.
Is BMI useless then?
It is useful for what it was built for, which is comparing groups of people cheaply, and it correlates well with body fat across a whole population. It becomes unreliable exactly when you apply a population statistic to one person, which is what everyone does with it.
What should I measure instead?
Waist circumference or waist-to-height ratio is the usual next step, because abdominal fat is what drives cardiometabolic risk. Keeping your waist under half your height is a simple and well-supported target, and it is one that BMI cannot capture.
What should I do with the number after I read it?
Nothing dramatic on its own. If you want a calorie figure to work from, the TDEE calculator and the calorie calculator estimate daily energy needs, and the water intake calculator handles hydration. For anything that touches your health, take the number to a doctor or a registered dietitian rather than acting on it alone.
Is the BMI calculator free?
Yes. It is completely free to use, with no signup, no account, and no paywall.
Does it stay local?
Yes. The height and weight you enter are processed entirely in your browser and never uploaded.
Are the results medical advice?
No. The output is a general estimate built from a standard formula and population averages, and estimates vary between individuals. For decisions about your health, diet, or training, check with a doctor or registered dietitian.