Free · No sign-up · Based on clinical data

Every calculator you need for your GLP-1 journey

From weight loss timelines to monthly costs and protein needs — free tools built on real clinical trial data from STEP and SURMOUNT trials.

15
Free calculators
45,000+
Clinical trial participants
~20%
Avg body weight lost on tirzepatide
Calculate my weight loss timeline →
Free · No account required · Results in seconds
🔬 Clinical Trial Data STEP 1 & SURMOUNT-1
💊 Semaglutide & Tirzepatide All major GLP-1 drugs
🆓 100% Free No account required
🔒 Private by Design Nothing stored or tracked
⚡ Instant Results No waiting, no sign-up

Featured tool

Weight Loss
GLP-1 Weight Loss
Timeline Calculator
Enter your current weight and medication to see your projected weight loss month by month — 3, 6, 12, and 24 months out. Based on STEP and SURMOUNT Phase 3 data.
Semaglutide Tirzepatide Goal weight Lifestyle factors
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Weight loss & body

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Body Composition · GLP-1
Muscle Loss Risk Calculator
Calculate your lean mass risk on GLP-1 medication. Get your personalised protein target and retention score.
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Comparison · Medication Choice
Semaglutide vs Tirzepatide
Side-by-side comparison of Ozempic vs Mounjaro — projected weight loss, costs, side effects, and dosing.
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Maintenance · Long-term
What Happens If I Stop GLP-1?
Calculate your weight regain risk, projected timeline, and personalised maintenance strategies after stopping Ozempic or Wegovy.
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Weight Loss
Weight Loss Timeline Calculator
Project your weight loss month by month on sema or tirzepatide. Includes goal date estimator.
Most popular · High intent
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Eligibility
GLP-1 Eligibility & BMI Calculator
See if you meet FDA criteria for GLP-1 prescriptions based on BMI and comorbidities.
FDA criteria
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Body Composition
Body Fat % Calculator
Track composition changes beyond the scale using Navy Method, BMI method, or measurements.
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Cost & Coverage
GLP-1 Monthly Cost Calculator
Compare real monthly costs across Wegovy, Zepbound, and compounded alternatives.
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Coverage
Insurance Coverage Estimator
Estimate your out-of-pocket costs based on plan type, diagnosis, and BMI threshold.
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Best Deals
Compare GLP-1 Provider Prices
Side-by-side comparison of 6 providers. Compounded semaglutide from $146/mo — 89% less than branded Wegovy.
Updated April 2026
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Cost
Compounded vs. Branded Savings
See exactly how much you'd save switching to compounded semaglutide or tirzepatide.

Dosage & medication

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Dosage · Compounded Vials
Vial Units Calculator
Convert your prescribed mg dose to syringe units for any compounded semaglutide or tirzepatide vial concentration.
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Dosage · Pharmacology
Half-Life Calculator
See exactly how much semaglutide or tirzepatide is still active in your system based on your last injection date.
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Dosage
Semaglutide Dose Schedule
Track your titration plan week by week. See when you'll reach maintenance dose.
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Dosage
Tirzepatide Dose Schedule
Mounjaro and Zepbound titration schedule with dose dates and injection reminders.
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Planning
Total Treatment Cost Calculator
Calculate total cost over 12 or 24 months including dose increases and refills.

Nutrition & fitness

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Nutrition
GLP-1 Protein Calculator
Daily protein targets to preserve muscle mass during GLP-1-driven weight loss.
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Nutrition
Calorie Deficit Calculator
Find your TDEE and optimal daily calories to complement your GLP-1 treatment.
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Nutrition
Macro Calculator for GLP-1 Users
Optimized macronutrient targets accounting for reduced appetite and muscle preservation goals.

Guides & articles

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Comparison Guide
Tirzepatide vs Semaglutide: Full Comparison 2026
Head-to-head clinical trial data, side effects, cost, and which GLP-1 is right for you. Based on SURMOUNT & STEP trial results.
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Pharmacokinetics Guide
How Long Does Ozempic Stay in Your System?
Week-by-week clearance timeline after your last injection — plus surgery prep guidance and what to expect when stopping.

How our calculators work

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Built on clinical trial data
Every projection uses published data from STEP 1 (semaglutide) and SURMOUNT-1 (tirzepatide) Phase 3 trials — the same studies used for FDA approval.
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Personalized to your inputs
We adjust projections based on your dose speed, diet approach, and goal weight — not just population averages.
03
Always free, no sign-up
Every tool on GLPcalcs is free to use with no account required. We don't store your health data.