How Reverse BMI Works
Standard BMI calculates your index from height and weight. Reverse BMI flips the formula: given your height and a target BMI, it solves for the weight that achieves that BMI.
Frequently Asked Questions
A reverse BMI calculator solves the BMI formula backwards. Instead of inputting your weight to get your BMI, you input your height and a target BMI to find the goal weight you need to achieve.
It depends on your height. At 5ft 7in (170 cm), BMI 25 = about 159 lbs (72 kg). At 5ft 10in (178 cm), BMI 25 = about 174 lbs (79 kg). Use this calculator for your exact height.
BMI is a useful screening tool but not a complete health measure. It does not account for muscle mass, bone density, fat distribution, age, or sex differences. Athletes often have high BMI values despite being lean and healthy. Consult a doctor for personalized health assessment.
The WHO defines normal BMI as 18.5–24.9. However, optimal BMI may vary: some research suggests 22–23 as ideal for longevity. Asian populations may have higher health risks at lower BMI thresholds (overweight defined as 23+).
Divide pounds by 2.20462. For example, 180 lbs / 2.20462 = 81.6 kg. Or multiply lbs by 0.4536.
Children use a different measure called BMI-for-age percentile, which compares to peers of the same age and sex. Standard adult BMI cutoffs do not apply to children under 18.