This BMI weight loss calculator estimates your current BMI, BMI prime, BMI percentile, and the target weight needed to reach a chosen BMI.
Health
BMI Weight Loss Calculator
Compute BMI, percentile and target weight based on reference percentile tables.
Calculator
About this calculator
Formula notes
BMI = weight (kg) / height (m)²; target weight = target BMI x height (m)²; weight difference = current weight - target weight.
Worked examples
- Example: height 175 cm and weight 70 kg gives BMI 22.86; a target BMI of 24 requires about 73.5 kg.
- For height 160 cm and weight 60 kg, BMI is 23.44; a target BMI of 21 corresponds to about 53.8 kg.
How to use it
- Enter height, weight, age, and sex.
- Set a target BMI or choose from the athlete option.
- Read BMI, BMI prime, percentile, target weight, and weight difference.
Frequently asked questions
Is BMI an exact body-fat measurement?
No. BMI is a screening index and does not directly measure body fat, muscle mass, or body composition.
What does BMI percentile show?
The percentile compares the calculated BMI with a reference population of the same age and sex, which can be more useful than BMI alone.
Limits and interpretation
- BMI does not distinguish fat from muscle and should not be used as the only health assessment.
- The target weight is a mathematical result; weight-loss plans should be set with a healthcare professional.