BMI Calculator
The calculator estimates BMI with the WHO formula: mass / height². At 70 kg and 170 cm the result is 24.2. That is the same ratio as on the BMI page. BMR and TDEE appear only after age, sex and activity.
Results
Enter data and click Calculate.
Not a clinic verdict. The main result is BMI with one decimal place. BMR and TDEE do not run from the two fields alone.
How it works
Body mass index in this calculator is weight in kg divided by height in metres squared. 70 / 1.70² = 24.221. The calculator writes 24.2 in the result. 92 kg and 180 cm give 28.4. 55 kg and 165 cm give 20.2.
This is the same WHO formula as the BMI card. The 18.5, 25, 30, and 40 cuts sit in the script. The category label comes from an i18n key, not a second table. 24.2 alone does not need age.
Mifflin BMR and PAL TDEE show only when age, sex, and activity are filled. Without those fields you still get 24.2. The Deurenberg fat estimate also waits for age and sex.
The mass band at BMI 18.5 to 25 is an extra row. It does not overwrite 24.2. The BMI card next door has the same quotient without those extras.
Enter weight, enter height, then Calculate. A comma in 70.5 parses. Zero height leaves 0 and a dash. A estimate from a quotient, not a diagnosis.
70 kg and 170 cm give 24.2. 92 kg and 180 cm give 28.4. 55 kg and 165 cm give 20.2. With a US header, weight is pounds and height is inches.
BMI = weight[kg] / (height[m])²
BMI = kg / m². 70 and 170 give 24.2. BMR and TDEE only after age, sex, and activity.
24.2
28.4
20.2
Related calculators
Common questions
What BMI at 70 kg and 170 cm?
24.2. 70 / 1.70², then one decimal place in the result.
What about 92 kg and 180 cm?
28.4. The same WHO quotient.
What about 55 kg and 165 cm?
20.2.
Is this a different formula from the BMI card?
No. The same kg / m² and the same WHO cuts. Extra rows are optional.
When does BMR show?
When you enter age and sex. 24.2 alone does not need them.
When does TDEE show?
When BMR is ready and activity from the PAL list is set. No activity hides TDEE.
Is 24.2 a diagnosis?
No. A estimate from a quotient. Not a clinic verdict.
Does a comma in 70.5 work?
Yes. 70.5 and 70,5 are the same weight.
Does a US header change 70 and 170?
Yes. Then 70 is pounds and 170 is inches. The 24.2 examples are metric.
How do I calculate BMI?
BMI = mass in kg / (height in metres)². At 70 kg and 170 cm the result is 24.2. Category cut-offs are a WHO convention, not a diagnosis.
How is this page different from the BMI calculator?
The main result is the same kg/m² and the same WHO bands. Here you can add age, sex and PAL to show optional BMR and TDEE rows.
When do BMR and TDEE show?
BMR after you enter age and sex (Mifflin). TDEE only when BMR and a PAL activity are present. BMI alone does not need those fields.
Is the BMI result a diagnosis?
No. It is an estimate from mass and height. It does not replace a clinical exam or body-composition assessment.
Knowledge sources
The 18.5–24.9 bands in this calculator are the WHO convention for adults, not a diagnosis.
Page updated in 2026.