Looking for a free GLP-1 calculator? Here are all of ours, made for people on Ozempic, Wegovy, Zepbound, Mounjaro, and GLP-1 pills — built by the team behind the free Pep GLP-1 tracker app. Every tool uses published clinical and FDA-label data, works on any device, and requires no signup. Updated October 2026.
Which GLP-1 calculator should I use?
It depends on the question you have right now. Wondering how much weight you might lose on Wegovy or Zepbound? Start with the weight loss calculator. Worried about the bill? Use the cost calculator. Starting a new medication? The dose schedule calculator builds your titration calendar. Late on a shot or pill? The missed dose calculator shows what the label says. Trying to keep muscle? The protein calculator sets a daily target. On a compounded vial? The units calculator converts mg to syringe units. All seven are free and need no signup as of October 2026.
Weight Loss Calculator
Project your week-by-week results on 10 medications — including compounds — with a personalized curve built from the STEP 1 and SURMOUNT-1 trials.
Cost Calculator
Estimate your real monthly and yearly cost across list prices, manufacturer self-pay programs, insurance copays, and compounded telehealth options.
Dose Schedule Calculator
Enter your start date and get your full titration calendar — every step-up date for Wegovy, Zepbound, Mounjaro, Ozempic, and more from the FDA labels.
Missed Dose Calculator
Missed a shot or pill? See exactly what the official label says to do for your medication based on how late you are.
Protein Calculator
Get your daily protein target for preserving muscle (and hair) during GLP-1 weight loss, with a realistic per-meal split for a small appetite.
Half-Life & Medication Level Calculator
See how much semaglutide or tirzepatide is still active in your body right now, and plot the rise and fall between weekly shots using each drug’s half-life.
Units Calculator
Convert your compounded semaglutide or tirzepatide dose from mg to insulin-syringe units and mL, based on your vial’s concentration.
How each GLP-1 calculator works
Every GLP-1 calculator on this page runs on published numbers rather than guesses: the pivotal clinical trials, the FDA prescribing labels, and the manufacturers’ own price lists. None of them store your data, and none of them need an account. Here is what sits behind each one, so you know how much weight to give the result.
Weight loss calculator: Wegovy, Zepbound, Mounjaro, Ozempic and compounds
The weight loss calculator builds a week-by-week curve from your starting weight and your medication. It uses the two pivotal trials: in STEP 1, people on semaglutide 2.4 mg (the Wegovy dose) lost an average of 14.9% of their body weight over 68 weeks, and in SURMOUNT-1, people on tirzepatide 15 mg lost an average of 20.9% over 72 weeks. As of October 2026 those remain the benchmark results for both drugs. If you searched for a Zepbound weight loss calculator, this is the one to use: choose Zepbound (or compounded tirzepatide), pick your dose path, and the curve adjusts for the slower early weeks while you titrate. For a plain-English look at how the two drugs compare, read our Zepbound vs Wegovy guide.
Cost and dose schedule calculators
The cost calculator compares four ways to pay: retail list price, the manufacturer self-pay programs (NovoCare, LillyDirect and the TrumpRx portal), an insurance copay, and compounded telehealth. Because prices move often, each program’s figure carries a “last reviewed” date on the calculator page, and our GLP-1 cost guide explains the fine print behind every number. The dose schedule calculator follows the FDA-label escalation for each drug, for example Wegovy’s 0.25 mg to 2.4 mg climb in four-week steps and Zepbound’s 2.5 mg to 15 mg climb, and turns your first-dose date into a calendar of the earliest date you could reach each step. Your prescriber may hold you at a lower dose for longer, so treat the dates as the fastest allowed path, not a plan.
Missed dose, protein, half-life and units calculators
The missed dose calculator quotes the exact instruction from each medication’s prescribing information based on how late you are, which is the same text your pharmacist would read to you. The protein calculator uses the higher-protein targets clinicians recommend during rapid weight loss, then splits the total across smaller meals that fit a suppressed appetite. The half-life calculator plots how much drug is still active between weekly shots using each label’s published half-life: about one week for semaglutide and about five days for tirzepatide. The units calculator does the vial math (dose in mg divided by the vial’s mg per mL, times 100 units per mL) for compounded semaglutide and tirzepatide, and you should always confirm the result with your pharmacy before drawing a dose.
Popular GLP-1 guides
The guides behind the tools — for when you want the full picture:
GLP-1 calculator FAQ
Is the GLP-1 calculator free?
Yes. Every GLP-1 calculator on this page is free, works in any browser on a phone or computer, and asks for no email address or account as of October 2026. They are built by the team behind the free Pep tracker app, which is also free to download on iPhone and Android.
Does the GLP-1 weight loss calculator work for Zepbound and compounded tirzepatide?
Yes. The weight loss calculator covers Zepbound, Mounjaro and compounded tirzepatide using the SURMOUNT-1 results, and Wegovy, Ozempic, the Wegovy pill and compounded semaglutide using the STEP trials. Pick your medication and dose path and the projection updates for that drug.
How accurate is a GLP-1 calculator?
A GLP-1 calculator gives you the trial average for your medication and starting weight, which is a useful expectation, not a promise. Real results vary widely: some people lose more than the average, and roughly one in ten lose very little even at the top dose. Dose timing, protein intake, sleep and activity all move the needle, which is why tracking your own trend matters more than any projection.
Download Pep free — track your shots, pills & progress in one app.
These tools are for educational purposes only and are not medical advice. Always consult your healthcare provider about your treatment.