How to use the calculator
- Enter weight in kilograms.
- Enter size in centimeters.
- Read BMI and classification.
Health
BMI calculator
Body mass index based on height and weight, with a rough classification.
Back to category: Health
Calculator
Calculation path
Step by step
-
Convert size to meters
Formula: cm / 100
Values inserted: 178/100
Result: 1.78 m
-
Calculate BMI
Formula: BMI = weight / height²
Values inserted: 78.0 / 1.78²
Result: 24.6
Instructions
How to use this calculator correctly
Limits of the calculation
- The BMI does not take into account what body weight is made up of.
Common mistakes
- Enter size in meters instead of centimeters.
- Misunderstand the classification as a medical statement.
Related guide: Correctly classify BMI, calorie requirement and calorie deficit
Examples
Typical calculations
Normal weight
BMI: 24.6
Load this exampleLight area above
BMI: 28.4
Load this exampleSlim person
BMI: 20.5
Load this exampleFAQ
Frequently asked questions
Is BMI a medical diagnosis?
No. It is only a rough statistical guideline value.
Why can BMI be misleading?
Muscle mass, body type, age and individual factors are not fully taken into account.
Does BMI apply to children?
Separate age-dependent classifications apply to children and young people.
What is a normal BMI?
For adults, the range from 18.5 to under 25 is often cited as normal weight.
Can I use the BMI for quick self-monitoring?
Yes, as a rough guide. If you are unsure, a medical assessment is more helpful.
Related calculators
Continue seamlessly
Calorie requirement calculator
Calculate basal metabolic rate and total requirement according to Mifflin-St-Jeor.
Calorie Deficit Calculator
Derive target calories from total requirements and desired deficit.
Percent calculator
Calculate percentage, percentage, base value and percent change.
Sources and notes
Rule status and context
- Formula
- BMI = weight / (height in m)²
- Note
- The BMI does not replace medical advice.