Free GLP-1 tool
GLP-1 Progress & Percentage Weight Loss Calculator
See what your two weights mean as a percentage — the same language used in many clinical trials.
What this result means
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.
What this tool cannot tell you
- What you will weigh next month.
- Whether a milestone means treatment is working or failing.
- Whether BMI category or a dose change is appropriate.
Methodology & sources
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.
- 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
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