Last medically reviewed: 2026-04-27 by GLP3 Planner editorial. References inline as available.
Key Takeaways
- GLP-1 Plotter is a popular free calculator built by the Reddit community, supporting semaglutide, tirzepatide, and retatrutide
- GLP3 Planner offers additional features like microdosing schedule support, shareable preview images, and comprehensive retatrutide titration protocols
- Both tools are completely free with no paywalls or subscription requirements
- Your choice depends on whether you need basic concentration plotting or advanced schedule planning with educational resources
- Neither tool replaces medical advice. Always consult your healthcare provider before adjusting dosing
GLP-1 Plotter vs GLP3 Planner: Feature Comparison
Before diving into the details, here's a side-by-side comparison of the key features that matter most when choosing a GLP-1 dose calculator.
| Feature | GLP-1 Plotter | GLP3 Planner |
|---|---|---|
| Price | Free | Free |
| Semaglutide Support | ✓ Yes | ✓ Yes |
| Tirzepatide Support | ✓ Yes | ✓ Yes |
| Retatrutide Support | ✓ Yes | ✓ Yes (with titration guides) |
| Microdosing Schedules | Limited | ✓ Full support |
| Shareable Links | ✓ Yes | ✓ Yes (with preview images) |
| Account Required | No | No (optional for saving) |
| Educational Content | Minimal | ✓ Extensive guides |
| Community | Reddit + Telegram | Resource articles |
| Mobile Experience | Basic responsive | Mobile-optimized |
What is GLP-1 Plotter?
GLP-1 Plotter (glp1plotter.com) is a free, community-built GLP-1 dose calculator that emerged from the Reddit GLP-1 communities. Originally created to help users of semaglutide (Ozempic, Wegovy) visualize their drug concentration over time, it has since expanded to support tirzepatide (Mounjaro, Zepbound) and retatrutide.
The tool uses publicly available pharmacokinetic data to model how GLP-1 medications accumulate and decline in your system between doses. This visualization helps users understand why weekly dosing works, when steady-state is reached, and how missed doses affect their drug levels.
GLP-1 Plotter Strengths
- Community-driven development: Built by users for users, with features requested by the r/Semaglutide and r/Ozempic communities
- Clean, focused interface: Does one thing well: plotting drug concentration curves
- No registration required: Use the tool immediately without creating an account
- Shareable protocols: Generate URLs to share your exact dosing schedule with others
- Completely free: No premium tiers or hidden features behind paywalls
- Transparent methodology: References peer-reviewed pharmacokinetic studies
GLP-1 Plotter Limitations
- No injection tracking: Plots future projections but doesn't track actual doses taken
- Limited schedule options: Basic frequency selections without advanced microdosing protocols
- Minimal educational content: Focus is on the calculator, not on explaining dosing strategies
- Basic support: Help is available through Telegram only, with no email or in-app support
- Crypto-only donations: If you want to support development, only Bitcoin, Ethereum, and Solana are accepted
- No preview images: Shareable links don't include visual previews for social sharing
GLP3 Planner: what it does differently
GLP3 Planner was built to address specific gaps in existing GLP-1 calculators, particularly around microdosing protocols and the emerging interest in retatrutide (the "GLP-3" triple agonist). While sharing the same foundational pharmacokinetic modeling as other calculators, GLP3 Planner adds layers of functionality for users who want more than basic concentration plots.
Where GLP3 Planner differs
Microdosing Support
Full support for split-dosing protocols including twice-weekly, three-times-weekly, every-other-day, and daily microdosing schedules. Visualize how different frequencies affect peak-to-trough ratios.
Shareable Preview Images
Every shared schedule includes an automatically generated preview image showing your drug concentration chart, perfect for sharing in forums, social media, or with healthcare providers.
Retatrutide Focus
Comprehensive retatrutide support with detailed titration guides, dosing schedule recommendations, and educational content specific to this emerging triple agonist.
Educational Resources
Extensive library of articles covering pharmacokinetics, microdosing science, dosing strategies, and practical guidance. Not just a calculator, but a learning resource.
Example: Retatrutide Microdosing Schedule
This twice-weekly retatrutide titration demonstrates how split dosing creates more stable drug levels with a lower peak-to-trough ratio compared to standard weekly dosing.
View Interactive Schedule →
GLP-1 Plotter vs GLP3 Planner Features
Pharmacokinetic Modeling
Both tools use similar pharmacokinetic principles to model drug concentration over time. The underlying math is based on published half-life data: semaglutide (~7 days), tirzepatide (~5 days), and retatrutide (~6 days). Neither tool claims medical-grade accuracy. They're educational visualization aids, not clinical decision-support systems.
Winner: Tie. Both tools provide comparable accuracy for their intended educational purpose.
Scheduling Flexibility
GLP-1 Plotter offers standard scheduling options: weekly, twice-daily to every-8-weeks frequencies. You can adjust start dates and use a "starting day offset" to shift doses.
GLP3 Planner adds explicit microdosing protocol support with pre-built schedules for twice-weekly, three-times-weekly, every-other-day, and daily dosing. These come with educational context explaining the pharmacokinetic rationale for split dosing.
Winner: GLP3 Planner for users interested in microdosing or alternative dosing strategies.
Sharing and Collaboration
Both tools generate shareable URLs that allow others to view your exact dosing schedule. GLP3 Planner adds automatic preview image generation, which means when you share a link on Reddit, Facebook, or in a message, recipients see a visual preview of your drug concentration chart before clicking.
Winner: GLP3 Planner for the preview image feature, which significantly improves sharing experience.
Community and Support
GLP-1 Plotter has strong roots in the Reddit community with an active Telegram support group. This community-driven approach means feature requests often get implemented based on user demand.
GLP3 Planner takes a different approach with comprehensive written resources and guides. While there's no dedicated community chat, the educational content aims to answer questions proactively.
Winner: GLP-1 Plotter for real-time community interaction; GLP3 Planner for self-serve educational content.
Mobile Experience
Both tools are browser-based with no native mobile apps. GLP3 Planner was designed mobile-first with touch-optimized controls and responsive charts. GLP-1 Plotter works on mobile but wasn't specifically optimized for smaller screens.
Winner: GLP3 Planner for mobile usability.
Wegovy and Mounjaro Calculator Support
Both tools support branded GLP-1 medications including Wegovy (semaglutide), Mounjaro (tirzepatide), Ozempic, and Zepbound. The underlying pharmacokinetic models use the same half-life data regardless of brand name. If you're looking for a free wegovy calculator or mounjaro half-life calculator, both GLP-1 Plotter and GLP3 Planner will work for your needs.
Winner: Tie. Both tools support all major GLP-1 medications equally.
Retatrutide Dosing Calculator Features
For users exploring retatrutide, both tools offer basic dose visualization. However, GLP3 Planner provides more comprehensive retatrutide resources including detailed dosing guides, titration schedules, and microdosing protocols specific to this triple agonist. If you need a retatrutide dosing calculator, GLP3 Planner offers the more complete package.
Winner: GLP3 Planner for retatrutide-specific content and guidance.
GLP-1 Plotter or GLP3 Planner: Which Is Better?
Choose GLP-1 Plotter If You:
- Want a simple, focused dose visualization tool
- Are active in Reddit GLP-1 communities and value real-time chat support
- Prefer a tool built by the community you're part of
- Only need basic weekly dosing calculations
- Don't need preview images for sharing
Choose GLP3 Planner If You:
- Want to explore microdosing or split-dosing protocols
- Need shareable schedules with visual previews
- Are interested in retatrutide and want dedicated resources
- Prefer comprehensive educational content alongside the calculator
- Use mobile devices frequently for planning
- Want to understand the "why" behind different dosing strategies
The good news: Both tools are free, so you can try both and decide which interface and feature set works best for your needs. Many users find value in using multiple tools for different purposes.
Try the Free GLP-1 Dose Calculator
Create your personalized GLP-1 dosing schedule with our pharmacokinetic calculator. Explore microdosing protocols, generate shareable visualizations, and access our comprehensive resource library, all completely free.
Other GLP-1 Calculator Alternatives
Beyond GLP-1 Plotter and GLP3 Planner, several other tools serve the GLP-1 medication tracking space:
Shotsy
iOS/Android app • $49.99/year
A dedicated GLP-1 shot tracking app focused on logging actual injections, tracking side effects, and monitoring weight progress. Unlike calculators, Shotsy emphasizes tracking what you've taken rather than projecting future doses. Best for users who want injection reminders and a comprehensive tracking diary.
Read our Shotsy comparison →Glapp
Web app • Free
A free GLP-1 tracking app featuring "Bodyphases" visualization that predicts hunger and side effects based on where you are in your dosing cycle. Strong privacy focus with no data selling. Best for users who want the "body phase" approach to understanding their medication cycle.
Read our Glapp comparison →Frequently Asked Questions
Is GLP-1 Plotter accurate?
GLP-1 Plotter uses published pharmacokinetic data from peer-reviewed studies to model drug concentration curves. The half-life values (semaglutide ~7 days, tirzepatide ~5 days, retatrutide ~6 days) are estimates that vary significantly between individuals based on factors like metabolism, body composition, and injection site. The tool is accurate for educational visualization but should not be used for clinical decision-making. Always consult your healthcare provider for personalized medical advice.
What is the best free GLP-1 calculator?
The "best" free GLP-1 calculator depends on your specific needs. GLP-1 Plotter is excellent for simple dose visualization with strong community support. GLP3 Planner is better if you need microdosing protocol support, shareable preview images, or comprehensive educational resources. Both tools are completely free with no premium paywalls, so you can try both to see which interface and features work best for your situation.
Can I use GLP-1 Plotter for retatrutide?
Yes, GLP-1 Plotter added retatrutide support in November 2023 using a 6-day half-life estimate. Both GLP-1 Plotter and GLP3 Planner support retatrutide dose calculations. GLP3 Planner offers additional retatrutide-specific features including detailed titration guides and microdosing protocol examples that may be helpful if you're exploring this emerging medication.
Do I need an account to use these calculators?
No, both GLP-1 Plotter and GLP3 Planner work without requiring account registration. You can use all core features immediately without signing up. GLP3 Planner offers optional account creation if you want to save multiple schedules for future reference, but this is not required for basic calculator functionality or generating shareable links.
What is microdosing GLP-1 medications?
Microdosing GLP-1 medications involves splitting the standard weekly dose into multiple smaller injections throughout the week. For example, instead of one 8mg injection weekly, you might take 4mg twice weekly or ~2.7mg three times weekly. The goal is to maintain more stable drug levels with lower peaks, which may reduce side effects like nausea. Microdosing is not FDA-approved and lacks clinical trial validation. It's an experimental approach some users explore under medical supervision. Learn more about microdosing →
How do I share my dosing schedule with my doctor?
Both tools generate shareable URLs you can send to anyone. With GLP3 Planner, shared links include an automatically generated preview image showing your drug concentration chart, making it easy for healthcare providers to quickly understand your dosing protocol. Simply create your schedule, click the share button, and copy the URL to send via email or message. The recipient doesn't need an account to view the shared schedule.
GLP-1 Plotter vs GLP3 Planner: which is better?
Neither tool is universally "better." The right choice depends on your needs. GLP-1 Plotter excels at simple concentration visualization with strong Reddit community support. GLP3 Planner is better for microdosing protocols, shareable preview images, and comprehensive retatrutide resources. Since both are free, try both and see which interface and feature set works best for your situation.
What's the best free GLP-1 dose calculator?
The best free GLP-1 dose calculators include GLP-1 Plotter and GLP3 Planner. GLP-1 Plotter is popular in Reddit communities for its clean interface and community-driven development. GLP3 Planner offers additional features like microdosing schedules, shareable preview images, and extensive educational content. Both support semaglutide, tirzepatide, and retatrutide without requiring payment or subscription.
Is there a free wegovy calculator?
Yes, both GLP-1 Plotter and GLP3 Planner offer free wegovy (semaglutide) calculators. These tools model the ~7-day half-life of semaglutide to show drug concentration over time. You can visualize standard weekly dosing or explore microdosing protocols. No payment or subscription required. Both tools are completely free to use.
What's the best tirzepatide dosing calculator?
For tirzepatide (Mounjaro, Zepbound) dosing calculations, both GLP-1 Plotter and GLP3 Planner are excellent free options. They use the ~5-day half-life of tirzepatide to model concentration curves. GLP3 Planner adds microdosing support and educational content if you want to explore split-dosing protocols. Try our free tirzepatide dosing calculator to visualize your schedule.
Is there a mounjaro half-life calculator?
Yes, free mounjaro (tirzepatide) half-life calculators are available at both GLP-1 Plotter and GLP3 Planner. Mounjaro has a half-life of approximately 5 days, meaning it takes about 4 weeks to reach steady state with weekly dosing. These calculators visualize how tirzepatide accumulates and declines between doses, helping you understand when you'll reach stable drug levels.
How do I calculate my retatrutide dose?
To calculate your retatrutide dose, use a pharmacokinetic calculator like GLP3 Planner. Enter your dosing schedule (typically starting at 2mg weekly, increasing every 4 weeks through 4mg, 8mg, to max 12mg). The calculator shows projected drug levels over time, when you'll reach steady state, and how different frequencies affect concentration. See our complete retatrutide dosing guide for detailed titration schedules and protocols.
Related Resources
Retatrutide Dosing Guide
Complete guide to retatrutide dosing: titration schedules, starting doses, half-life, and how to use a dosing calculator.
Microdosing Retatrutide
Explore split-dose protocols, benefits, risks, and pharmacokinetic modeling for microdosing GLP-1 agonists.
Shotsy Alternatives
Looking for free alternatives to the $49.99/year Shotsy app? Compare features and find the best option for your GLP-1 tracking needs.
Glapp Alternatives
Compare Glapp's bodyphases feature with other GLP-1 tools. Find the right balance of tracking, visualization, and educational resources.
Medical Disclaimer
This comparison is for informational purposes only. GLP-1 dose calculators and plotters are educational tools that should not be used for clinical decision-making. Pharmacokinetic models are estimates based on population averages. Your individual response may vary significantly. Always consult with a qualified healthcare provider before starting, stopping, or modifying any medication regimen. Neither GLP-1 Plotter nor GLP3 Planner should replace professional medical advice.