Calculate adult body mass index using metric or imperial measurements. In imperial mode, enter height in total inches: 5 feet 9 inches is 69 inches.
BMI = weight in kilograms / height in metres². Convert pounds to kilograms using 0.45359237 and inches to metres using 0.0254.
At 70 kg and 175 cm, BMI = 70 / 1.75² ≈ 22.9 kg/m². The same person entered in pounds and inches should produce the same result, apart from rounding.
BMI is a screening measure, not a diagnosis or a direct measurement of body fat. Adult BMI should not be used as a child growth assessment or to set a pregnancy weight target. Muscle mass, age, medical history and other measures affect interpretation.
Select imperial units and enter total inches. Multiply feet by 12, then add the remaining inches: 5 feet 9 inches becomes 69 inches. Enter weight in pounds.
No single BMI result establishes health. It is one screening measure that must be interpreted alongside other information. This calculator does not diagnose illness or choose a target weight.
References support the identified formula, unit or jurisdiction. They do not imply endorsement of this site. Check the original document for current conditions and exceptions.
English edition: 16 September 2026.