Free tool · Progress
GLP-1 Progress & Percentage Weight Loss Calculator
See how much your weight has changed, as a number and as a percentage.
Use this toolHow this was calculated
Convert starting and current weight into pounds or kilograms lost and percentage total-body-weight change, with optional BMI arithmetic.
Percent total-body-weight change = (starting − current) ÷ starting × 100. Educational milestones are 5%, 10%, 15%, 20%, and 25% of the starting weight. Optional BMI uses the CDC adult formula: weight (kg) ÷ height (m)². Height is not required. BMI is a screening calculation, not a diagnosis.
Important limitations
- What you will weigh next month.
- Whether a milestone means treatment is working or failing.
- Whether BMI category or a dose change is appropriate.
Research & sources
- Adult BMI calculator and formula
Centers for Disease Control and Prevention · Last verified 2026-09-16
BMI = weight (kg) ÷ height (m)². Used only as optional arithmetic when the user enters height. BMI is a screening calculation, not a diagnosis.
- Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1)
New England Journal of Medicine · 2021-03-18 · Last verified 2026-09-16
Encoded published week-68 mean percent body-weight change only. Intermediate figure points are not interpolated.
- Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1)
New England Journal of Medicine · 2022-07-21 · Last verified 2026-09-16
Encoded published week-72 mean percent body-weight change for 5 mg, 10 mg, and 15 mg only.
Related WellForm MD resources
Need individualized guidance?
These tools are free public education. WellForm MD also provides physician-led medical weight-loss care when you want a plan that belongs to you.