BMI Calculator
Free bmi calculator to calculate bmi. Instant results in your browser — no signup.
bmi calculator, bmi, Calculate BMI, body mass index, bmi chart, healthy weight, bmi range, Calculate BMI percentile for child
Assessment
Score or classify a result against reference ranges.
Measurements
Enter values to score against reference ranges.
Results update when you click Calculate BMI.
Assessment
Interpret the score, status, and range.
Your BMI
23.0
Normal weight
Estimates only. Not medical advice.
Category
Normal weight
Healthy BMI range
18.5 – 24.9
Weight for healthy BMI
129 – 174 lb
23.0
Normal weight
UnderNormalOverObesity
Balanced meals
30 min activity
Stay hydrated
7–8 hrs sleep
Screening only — not a medical diagnosis.
BMI classification (adult)
| Category | BMI range |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25 – 29.9 |
| Obesity | ≥ 30 |
Screening only
BMI is a population screening measure, not a medical diagnosis. Muscle mass, age, and body composition also matter.
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What this result means
Free bmi calculator to calculate bmi. Instant results in your browser — no signup. US: BMI = 703 × lb / in². Metric: BMI = kg / m². Healthy adult range is commonly cited as 18.5–24.9.
Assumptions
- Rule dependency: Formula / population assumption.
How is it calculated?
US: BMI = 703 × lb / in². Metric: BMI = kg / m². Healthy adult range is commonly cited as 18.5–24.9.
Example
5′10″ and 160 lb → BMI ≈ 23.0 (normal weight range).
Frequently asked questions
Is BMI a diagnosis?+
No. It is a screening number only and does not diagnose health conditions.
What is a healthy BMI range?+
For many adults, 18.5–24.9 is the commonly cited “normal weight” band. Individual needs vary.
Why might athletes score high?+
Higher muscle mass can raise BMI without indicating excess fat.