Goal Weight for Target BMI Calculator

How it is calculated

BMI is weight divided by height squared, so this tool solves it backwards: weight = BMI × (H / 100)². H is height in centimetres, which is converted to metres first, and BMI is the target value in kg/m². The answer is in kilograms, and the pound figure is the kilogram value times 2.20462, both shown with two decimals. Height must be between 50 and 272 cm and the target BMI between 5 and 100; anything outside those ranges, or an empty field, shows no result. Inside the ranges the tool does not judge whether a goal is healthy, so a BMI of 5 or 100 still produces a number. The weight depends only on height and BMI, and it says nothing about body fat, age or muscle.

Common mistakes

• Entering height in metres (1.7). The field is centimetres and anything under 50 shows no result, so 1.7 gives nothing.
• Thinking the weight changes in proportion to BMI only. Weight grows with the square of height, so at 170 cm one BMI point is 2.89 kg, but at 190 cm it is 3.61 kg.
• Entering height in inches. A value such as 67 is read as 67 cm and returns an implausible 9.88 kg, because it falls inside the accepted 50 to 272 cm range.
• Typing a target BMI outside 5 to 100, such as 500. The tool shows no result.
• Using the number as a prescription. BMI ignores muscle, bone and fat distribution, so a goal weight is a planning figure, not medical advice.