Your BMI
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BMI is a general screening measure and doesn't account for muscle mass, age or body composition. Talk to a healthcare professional for personal advice.
Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
Read the privacy policyHow this calculation works
Understand the method, inputs and limits behind your result.
- Formula
- BMI = weight (kg) / height (m)². Imperial inputs are converted to kilograms and meters.
- Variables
- Weight = body weight
- Height = standing height
- Units
- Weight: kg or lb
- Height: cm or feet and inches
- BMI: kg/m²
- Example
- At 70 kg and 175 cm: 70 / 1.75² = 22.86 kg/m².
- Assumptions
- Adult screening measure. BMI does not measure body fat directly or distinguish muscle from fat. Adult categories are not appropriate for children or pregnancy.
- Source
- Last reviewed
- Implementation review; specialist review has not been recorded.
Methodology & References
The method depends on the selected model and input options. Review the assumptions and references above before interpreting the result.
- Choose Metric or Imperial.
- Enter height in the displayed units and weight in kilograms or pounds.
- Review the BMI result and the tool’s screening category.
Interpretation and limitations
- Does BMI diagnose health or measure body fat? No. BMI is a screening measure and does not directly measure body fat or replace an individual health assessment.
- Is this an age-specific calculator for children? No. The interface uses fixed categories and has no age or sex inputs. Children and teens need age-specific interpretation rather than these adult-style labels.
References
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the BMI Calculator
Calculate BMI from height and weight using metric or imperial inputs.
- 1 Choose Metric or Imperial.
- 2 Enter height in the displayed units and weight in kilograms or pounds.
- 3 Review the BMI result and the tool’s screening category.
Example and practical tips
At 70 kg and 1.75 m, BMI is approximately 22.9 using weight divided by squared height in meters.
Further reading
Frequently asked questions
Does BMI diagnose health or measure body fat?
No. BMI is a screening measure and does not directly measure body fat or replace an individual health assessment.
Is this an age-specific calculator for children?
No. The interface uses fixed categories and has no age or sex inputs. Children and teens need age-specific interpretation rather than these adult-style labels.
Practical guides
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How to Use BMI Calculator
Calculate your body mass index from height and weight in metric or imperial units, and see which BMI category you fall into. Free online BMI calculator.
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