How to use this calculator
BMI relates weight to height. Imperial input is converted to kilograms and meters before applying the same equation.
- Enter bmi interpretation, measurement system, weight (kg or lb) and review the remaining options.
- Select Calculate or change a value to update the result. Read the result label and units before copying.
- Use Reset to restore the worked starting values.
Formula and method
Adult screening estimate only, not a diagnosis. Not appropriate for children, pregnancy, or assessing muscle and fat distribution.
Worked example
70 kg at 175 cm gives a BMI of approximately 22.86.
Questions about bmi calculator
Can BMI measure body fat or calorie needs?
No. BMI is a weight-to-height screening measure and does not directly measure body fat or energy expenditure. BMR estimates resting energy; Calorie Needs includes an activity multiplier. Adult BMI categories are not a diagnosis.
Choose the tool for your question
- BMR: Estimate resting energy use rather than weight relative to height.
What assumptions should I check?
Adult screening estimate only, not a diagnosis. Not appropriate for children, pregnancy, or assessing muscle and fat distribution.
Are my inputs saved?
Calculations run in your browser. We store only tool IDs for favorites and recent tools. Sharing inputs in links is disabled for this category.
Health tools provide general estimates, not diagnoses or personal medical advice. BMI offers a labeled CDC child/teen reference; adult screening bands must not be applied to children. Discuss health and exercise decisions with a qualified professional. Read the tool-specific sources below for background on the method.