Picture this: you’ve just reconstituted a vial of BPC-157, your insulin syringe is in hand, and you’re staring at a math problem you don’t want to get wrong. How many units do you draw for a 500 mcg dose? You added 2 mL of BAC water to a 5 mg vial. Your brain freezes. This is the exact moment a good peptide tracker app earns its keep.
I’ve spent time going through every calculator and tracking tool I could find. Here’s what I’d actually tell a friend.
1. FormBlends Peptide Calculator
The problem most people hit first isn’t the injection. It’s the mg-vs-mcg confusion. One milligram is 1,000 micrograms, and getting that wrong by a factor of 1,000 is genuinely dangerous. FormBlends built its free web calculator specifically around preventing that mistake.
You enter three things: what’s in the vial (mg or mcg), how much bacteriostatic water you added (mL), and your target dose per injection. The tool spits back the concentration per mL, exactly how many units to draw, and how many total doses the vial contains. Clean and direct.
What makes it stand out is that the math is visible on screen, not hidden behind a black-box result. You can check every step yourself. A visual syringe bar shows where your fill line lands, which is a small thing that matters when you’re new. It covers U-100, U-50, and U-40 syringes, and it has one-tap presets for BPC-157 (5 mg and 10 mg vials), TB-500, ipamorelin, tesamorelin, and GLP-1 compounds. The same calculator lives inside a full iOS/Android app that also logs doses and tracks injection-site rotation across 55 compounds.
FormBlends is an actual 503A pharmacy company, not an anonymous webpage. That context matters when you’re deciding whether to trust a calculation. No sign-up required, completely free to use.
*(Fair point: this tool tells you how to measure a dose you’ve already been prescribed. Choosing the right dose for your situation is your provider’s call, not this tool’s. Follow your provider.)*
2. PeptideFox
PeptideFox (peptidefox.com) supports over 30 peptides and adds something most calculators skip: guidance on optimizing BAC water volume so your draw lands on clean unit marks rather than awkward fractions. It also includes a visual reference guide. Useful if you want a sanity-check on your reconstitution setup.
3. MyPeptideMatch
Free, no account needed. It covers BPC-157, semaglutide, tirzepatide, and TB-500, among others. One of the few tools that explicitly includes GLP-1 class drugs alongside traditional healing peptides in the same interface.
4. LeadWest Medical Calculator
LeadWest runs a medical practice and built their calculator around the compounds they actually prescribe: retatrutide, BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, sermorelin, and GHK-Cu. It’s clinical in feel. Straightforward if your compound is on their list.
5. Outliyr Peptide Calculator
Outliyr’s tool overlaps with LeadWest in peptide coverage (BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, GHK-Cu, and GLP-1 class). The surrounding website has extensive editorial content on peptides, so the calculator sits inside a broader research context. Good if you’re reading as well as calculating.
6. PeptideDeck
Enter your vial size in mg, your BAC water volume in mL, and your target dose in mcg. PeptideDeck outputs concentration and the draw volume in both mL and insulin units. Minimal design. Gets the job done.
7. peptidereconstitutecalculator.com
Narrow focus: BPC-157 only, U-100 syringe, converts mcg to units. Not flexible, but if BPC-157 is all you’re calculating, it does that one thing clearly.
8. Prime Peptides Calculator
Basic reconstitution math with a straightforward interface. One of several vendor-adjacent calculators that exist more as a customer service tool than a standalone product. Functional.
9. peptides.org Dosage Charts
Static reference tables, not an input-driven calculator. They list common peptide dose ranges for background reading. Better as a background reference than an active dosing tool, but worth bookmarking alongside whichever calculator you settle on.
A Note on Anonymous Tools
Most of these are web pages with no named company behind them. That’s fine for simple math, since the reconstitution formula is the same for every lyophilized peptide: concentration equals total mg divided by water added in mL. But knowing who built a tool is still worth a thought before trusting a syringe fill.
Common Questions
Which of these apps actually tracks injection-site rotation, not just dose history?
FormBlends is the only tool on this list that does both. Its iOS/Android app logs doses and rotates injection sites across 55 compounds. The others are primarily calculators, and most are web-only with no persistent logging at all. If site rotation matters to your protocol, FormBlends is the one to install.
Does PeptideFox or MyPeptideMatch handle GLP-1 drugs like semaglutide and tirzepatide?
MyPeptideMatch does, explicitly. It puts semaglutide and tirzepatide in the same interface as BPC-157 and TB-500, which is uncommon. PeptideFox focuses on traditional research peptides and does not specifically call out GLP-1 compounds in its public documentation. FormBlends and Outliyr also include GLP-1 class presets.
Can I trust a calculator built by a vendor like Prime Peptides for actual dosing math?
The reconstitution formula itself is simple and fixed: total mg divided by mL of BAC water equals concentration per mL. A vendor calculator isn’t wrong about arithmetic. The concern is whether the tool will stay maintained and whether the company has any clinical accountability. FormBlends, as a licensed 503A pharmacy, carries more formal accountability than an anonymous vendor page.
What is the difference between peptidereconstitutecalculator.com and the other tools here?
It does one thing: BPC-157 on a U-100 syringe, mcg to units. No other compounds, no other syringe types. Every other tool on this list covers at least several compounds. Use it if BPC-157 is your only compound and you want the simplest possible page, but switch to a multi-compound tool if your protocol ever expands.
Does LeadWest’s calculator work for compounds not on their prescribing list, or only the ones they named?
LeadWest built the tool around what their practice prescribes: retatrutide, BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, sermorelin, and GHK-Cu. There is no public documentation indicating it accepts arbitrary compound inputs. If your compound isn’t on that list, PeptideFox with its 30-plus peptide library or FormBlends with 55 compounds is a better fit.
Sources
- U-100 insulin syringe specification: standard 100 units per 1 mL, FDA labeling conventions
- BPC-157 and TB-500 typical dosing ranges (mcg): publicly cited in peer-reviewed peptide research summaries
- peptidefox.com, mypeptidematch.com, leadwestmedical.com, outliyr.com, peptidedeck.com, peptidereconstitutecalculator.com, primepeptides.com, peptides.org (all accessed 2025/2026)
- 503A compounding pharmacy regulatory designation: USP <797>, FDA compounding guidance
