GLP-1 Weight Loss Calculator

Yes. Leave “Already taking this medication?” off, choose a medication, and enter a starting weight and a lower goal weight. The tool shows the percentage difference to your goal plus a separate published trial endpoint graph and table. It cannot give you a personal goal date without a recorded weight trend.

Yes. Choose Start and end dates, then enter the dates of your two weight measurements. The calculator counts the exact days between them and converts that interval to weeks. The illustrative future month is counted from today, not from the older measurement date.

Yes. Choose Months and enter whole months between measurements. The calculator treats each month as about 4.35 weeks to estimate the past weekly average. If you know both dates, use the date option for an exact elapsed interval.

It subtracts current weight from starting weight, divides by elapsed weeks to get a past average decrease, then divides the remaining difference to your goal by that past average. It adds that many weeks to today and shows an illustrative month. It assumes the same average continues, which may not happen.

No. It extends a past recorded average in a straight line. Real weight trends can slow, plateau or reverse, so the displayed month is a scenario rather than a prediction.

The calculator does not show a future goal date when the entered period has no downward trend. A flat or upward interval cannot supply the positive pace needed for a straight-line loss scenario.

If your current weight is at or below the entered goal, the tool shows that the goal has already been reached and reports zero remaining weeks. It does not advise what your next goal should be.

Straight-line dates become particularly misleading over long horizons. When the arithmetic exceeds 104 weeks, the tool reports the duration without assigning a calendar month. Your actual trend may change much sooner.

Yes. Choose kg or lb and enter all three weights in that unit. Switching the unit converts entered weights, while elapsed weeks stays the same.

No. The goal timeline uses only your entered weights and elapsed time. Selecting Wegovy, Zepbound, Mounjaro, Ozempic or retatrutide switches a separate graph to a relevant clinical trial. The graph does not change the date calculation or predict your result.

At week 72 in SURMOUNT-5, the treatment-regimen analysis reported mean weight reductions of 13.7% with semaglutide and 20.2% with tirzepatide. Participants were adults with obesity or overweight and a weight-related condition, without type 2 diabetes. These group averages cannot tell you how much weight you will lose.

In adults with type 2 diabetes taking metformin, mean weight reductions at week 40 were 7.6 kg, 9.3 kg and 11.2 kg with tirzepatide 5 mg, 10 mg and 15 mg, respectively, and 5.7 kg with semaglutide 1 mg. The trial tested specific doses and is not a prediction for someone using either brand.

The investigational 12 mg retatrutide arm reported a mean weight reduction of 24.2% at week 48, compared with 2.1% in the placebo arm. This was a secondary endpoint in a phase 2 trial, not an approved medication outcome or an individual forecast. Retatrutide is not FDA approved.

No. SURMOUNT-5, SURPASS-2 and the retatrutide phase 2 study enrolled different populations, used different doses and follow-up times, and reported results in different units. Only results within the same trial should be interpreted side by side.

No. Each graph shows only the published study endpoint at week 40, 48 or 72, depending on the medication. It does not create or estimate intermediate trial results, and your personal timeline is based on your recorded pace rather than trial averages.

It applies a trial arm’s published average reduction to the starting weight you entered. For studies reporting kilograms, it subtracts that average kilogram change after converting to your selected unit. This is an arithmetic illustration, not a prediction of your weight at the study endpoint.

If you enter two measured weights and the time between them, the table extends your past average change per week in a straight line from your current weight. It stops at your entered goal or week 72, whichever comes first. These milestones are not clinical trial averages and do not account for plateaus.

There is no reliable universal number. As an arithmetic illustration, a past average of 1 lb lost per week would put a 20 lb difference at 20 weeks if that exact pace continued. Individual progress can differ, and the tool does not provide a treatment forecast.

No. It describes your entered past measurements divided by elapsed weeks. The calculator does not judge whether that pace or goal is appropriate. Discuss concerns about your weight trend with your healthcare professional.