Underweight0.0 to 18.49
Result below the range considered healthy for adults.
Health & wellness tool
BMI Calculator with classification, educational context, and instant reading
Enter weight and height to find your body mass index, compare the value with the reference chart, and understand the result while respecting the indicator's limitations.
Includes
- Real-time BMI calculation
- Automatic range classification
- Copy result and clear fields
- Visual reference chart
- Educational guidance, related tools, and a result summary
- Example reading with weight in kilograms and height in centimeters
- Limits for adults and contexts that need individual assessment
Calculation updated as fields change
Calculate BMI and visualize classification immediately
Enter weight and height to get your body mass index, understand the corresponding classification, and check the reference table.
Enter a weight greater than zero.
Enter a height greater than zero.
Summary
Enter positive weight and height to calculate BMI in real time and compare it with reference ranges.
ResultIMC
Calculated index
Enter valid values.Classification
Waiting for calculation
Enter valid weight and height to view BMI, range, and reference table.
Healthy weight18.5 to 24.99
Range generally associated with good health markers.
Overweight25.0 to 29.99
Result above healthy range, indicating excess weight.
Class 1 obesity30.0 to 34.99
Initial range of obesity, indicating potential health risks.
Class 2 obesity35.0 to 39.99
Moderate range of obesity, requiring higher medical attention.
Class 3 obesityFrom 40.0
Highest range of obesity under the BMI standard.
Weight and height go into a simple reference formula
- 1. Enter weight in kilograms and height in centimeters.
- 2. Height is converted to meters before calculation.
- 3. BMI is calculated as weight divided by height squared.
- 4. The final value is compared with standard adult classifications.
BMI assists screening, but does not replace professional assessment
- Use BMI as an initial educational indicator, not a definitive diagnosis.
- Factors like muscle mass, age, biological sex, and clinical context also matter.
- Extreme results deserve careful interpretation and professional support when needed.
- Verifiable example: 70 kg and 170 cm produce a BMI of 24.22, classified in the healthy-weight range; the number should be interpreted together with the person's context.
- The displayed reference is intended for adults and may not fit children, pregnancy, athletes, or specific clinical situations.
- The reference table makes it easy to compare your calculated index with standard ranges.
FAQ
Summary
What does this BMI calculator do?
The tool calculates body mass index from weight and height, shows classification ranges, and displays educational context.
Is BMI a diagnosis?
No. BMI is a screening and health education tool. It does not replace clinical evaluation, body composition, age, sex, or personal context.
Which formula does the calculator use?
The formula is BMI = weight in kilograms divided by height in meters squared.
Does BMI replace a professional assessment?
No. BMI is a screening reference based on weight and height; it does not account for body composition, age, history, or clinical context. Use it for education and discuss personal conclusions with a health professional.
Does the classification apply to everyone?
Not necessarily. The displayed ranges are general adult references and may require different interpretation for children, pregnant people, athletes, older adults, or people with specific clinical conditions.
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Open toolGet a quick reference for the relationship between weight and height
The calculator is for adults who want a first reading of their BMI, health students, and people tracking their own progress over time.
- Calculate BMI from weight in kilograms and height in centimeters.
- See which reference range the value falls into.
- Track changes by comparing results on different dates.
How to calculate
- 1. Enter your weight in kilograms.
- 2. Enter your height in centimeters.
- 3. Read the BMI and its range.
- 4. Check the reference table to understand the result.
Weight divided by height squared
BMI is calculated as weight (kg) ÷ height (m)². Height in centimeters is converted to meters before the calculation.
Below 18.5
Underweight range.
Values in this range deserve a conversation with a health professional.
18.5 to 24.99
Healthy weight range.
This is the general reference for adults.
25 and above
Overweight and obesity ranges.
From 30 upward, obesity is split into classes: 30, 35, and 40.
An adult weighing 70 kg at 1.75 m
Enter 70 for weight and 175 for height.
Calculation
70 ÷ (1.75 × 1.75)
BMI
22.86
Range
Healthy weight
The result is shown with two decimal places.
BMI is a screening tool, not a diagnosis
The index only considers weight and height.
- It does not tell muscle from fat, so it can mislead for athletes.
- The ranges apply to adults; children, teens, pregnant people, and older adults use other references.
- Any health decision should be made with a professional.
Use it as a starting point
The result helps start a conversation about health, but it does not replace tests or an individual assessment.