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Health & wellbeing · Free online tool
BMI calculator
Calculate body mass index and a healthy weight range from weight and height. Give a quick screening figure and visible healthy-weight range while keeping the limitation that BMI is not a diagnosis.
3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly
BMI calculator workspace
Runs locally in your browser
BMI is a screening estimate, not a diagnosis or a measure of body composition.
Result
BMI—
Category—
Healthy weight range—
Important context
Use it with confidence
How to use the BMI calculator.
Calculate and review
Use the main action when needed. BMI = weight in kilograms ÷ height in metres squared. The healthy range shown uses the 18.5–24.9 reference band.
Try a worked example
70 kg at 175 cm gives a BMI of about 22.9, which falls in the healthy-weight range.
Check the assumptions
BMI does not measure body composition, muscle, age, ethnicity or health. Use it as one screening figure, not a medical assessment.
A clearer answer
What is a healthy BMI range for my height?
Enter your weight and height in the units you know. The calculator returns BMI, the general screening category and the 18.5–24.9 healthy-weight range in kilograms.
See the useful decision, not only one number.
The result stays on your device and the page keeps the limitation visible: BMI does not measure body composition, muscle, age or ethnicity.
Worked example: 70 kg at 175 cm
70 ÷ (1.75 × 1.75) = 22.86, which falls in the healthy-weight range of roughly 56.7–76.3 kg for that height.
Method: BMI = weight in kilograms ÷ height in metres squared.
Common mistakes to avoid.
- Treating BMI as a diagnosis
- Ignoring muscle, age, ethnicity and body composition
- Using it for children without paediatric guidance
- Comparing personal scores across very different builds
Use the result with the right assumptions.
NHS and global health guidance use BMI as a screening measure for adults, not a complete health assessment. Speak to a clinician for individual advice.
Helpful answers
BMI calculator FAQs.
Is the BMI calculator free?
Yes. Guests receive 3 runs per rolling 24 hours, verified free accounts receive 10, and Premium subscribers receive unlimited normal use.
Does UtilHub upload or save my inputs?
No. This tool runs in your browser and UtilHub does not receive or store the values you enter. Your browser or device may still retain normal local history or form data.
How does this BMI calculator work?
BMI = weight in kilograms ÷ height in metres squared. The healthy range shown uses the 18.5–24.9 reference band.
What should I check before using the result?
BMI does not measure body composition, muscle, age, ethnicity or health. Use it as one screening figure, not a medical assessment.
Can I enter my height in feet and inches?
Yes. Leave the centimetres field empty and enter feet and optional inches; the tool converts them to centimetres before calculating.
Is BMI accurate for athletes?
It can overestimate body fat for muscular builds because it does not distinguish muscle from fat. Treat it as one screening figure rather than a diagnosis.