About this BMI Calculator
BMI Calculator provides an adult Body Mass Index value from height and weight. You can use metric or imperial inputs. The result is best treated as a general screening number rather than a complete assessment of individual health.
Formula or method
BMI = weight in kilograms ÷ height in meters². Imperial inputs are converted before applying the same formula.
Example
70 kg at 1.70 m gives a BMI of about 24.2.
Common uses
- Calculate an adult BMI from common height and weight units.
- Convert an existing height/weight pair into a screening value.
- Use alongside professional guidance when BMI is an appropriate measure.
How to use this tool
- Enter the values or text requested by the calculator.
- Choose units or options when the tool provides them.
- Select the calculation button and review the result.
- Use the formula, example and notes on this page to check whether the result fits your situation.
Important note
BMI is a screening measure and does not directly measure body fat, fitness, body composition or diagnose a health condition.
Health note: This calculator provides general screening information only. It cannot diagnose a medical condition or replace advice from a qualified healthcare professional.
Health reference
For general adult BMI information and limitations, see the CDC overview of BMI.
Frequently asked questions
Is BMI a diagnosis?
No. BMI is a screening measure and does not diagnose a medical condition.
Does BMI work the same for everyone?
BMI has limitations and does not directly account for body composition or individual clinical circumstances. A qualified health professional can interpret it in context.