My first vial of BPC-157 sat on the desk for two days because I couldn’t get the math to click. Five milligrams in the vial, 2 mL of bacteriostatic water, a U-100 syringe, and a target dose of 250 mcg. Every calculator I tried either spit out a number without showing any work, or it assumed I already knew whether to type “0.25” or “250.” I made the mg-to-mcg error on the first try. That is a 1000x mistake. It happens constantly.
Here are the eight tools I found, grouped by who they actually help.
For Beginners Who Need the Math Explained
FormBlends Peptide Calculator
Start here if you have never done this before. The single thing that sets it apart: it shows every calculation step on screen so you can follow the logic, not just trust a number. You enter the vial size, your water volume, and the target dose per shot. It tells you the concentration per mL, the exact units to draw, and how many doses remain. One-tap presets for BPC-157 (5 mg or 10 mg), TB-500, ipamorelin, tesamorelin, and a GLP-1 option save setup time. The visual syringe bar is genuinely useful the first few times. Free, no account, works on web or inside the FormBlends mobile app.
PeptideDeck
Clean three-field interface: mg of peptide, mL of BAC water, target dose in mcg. Output is concentration plus the draw volume in both mL and insulin units. Nothing flashy. Straightforward enough for a first-timer who just wants the answer fast.
For People Running Multiple Compounds
PeptideFox
This one covers more than 30 individual peptides and, more usefully, it optimizes the BAC water volume suggestion to produce “clean” unit draws, meaning whole or half units rather than awkward decimals on the syringe. A visual reference guide walks through where the dose lands on the barrel. Good when you are managing several different vials at once and want consistency across all of them.
Outliyr Peptide Calculator
Covers BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, GHK-Cu, and the GLP-1 class in a single tool. Helpful if your protocol mixes healing peptides dosed in the low-mcg range with GLP-1 compounds that often come in much higher-mg vials. The reconstitution math is identical across all of them, but having the presets grouped together saves time.
LeadWest Medical
Lists retatrutide, BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, sermorelin, and GHK-Cu. The medical framing is slightly more formal than most of the anonymous pages. Worth bookmarking if you are working through a telehealth protocol and want a second reference to cross-check your provider’s instructions.
For GLP-1 and Weight-Management Peptides Specifically
MyPeptideMatch
Free tool that specifically calls out semaglutide, tirzepatide, BPC-157, and TB-500 by name. Useful when you are dealing with high-mg GLP-1 vials where the reconstitution ratios produce concentrations very different from a typical 5 mg healing-peptide vial. The core math is the same, but the scale of the numbers trips people up.
For BPC-157 One-Compound Focus
peptidereconstitutecalculator.com
Single-purpose. BPC-157 only. Translates a microgram dose directly into the corresponding graduation marks on a U-100 insulin syringe. If all you want to know is “I have a 5 mg vial and I want 400 mcg, how many units do I pull,” it answers that in about ten seconds. No extras.
For Reference Rather Than Calculation
peptides.org Dosage Charts
Static reference charts, not an interactive calculator. Useful as a sanity check on dose ranges reported in research literature. BPC-157 and TB-500 are typically dosed in the 250 to 500 mcg range per injection. Seeing that range in a reference source helps confirm whether the number a calculator produced is in a reasonable neighborhood. Pair it with an actual calculator rather than using it alone.
One Fact Worth Remembering Across All of These
Adding more bacteriostatic water to a vial does not change how much peptide is in it. It changes the concentration, which changes how many units you draw. The dose delivered stays the same. Every calculator above assumes you understand that. If you do not, go back to the tool that shows its work.
Common Questions
Which of these tools actually shows you the math instead of just giving a number?
FormBlends is the only one in this list that displays each calculation step on screen. You can see the concentration-per-mL figure, the units-to-draw figure, and the remaining-doses count all at once. That transparency matters most when you are new and need to verify the logic rather than simply trust an output.
Does it matter which calculator I use for semaglutide or tirzepatide versus BPC-157?
The underlying formula is identical, but the scale of the numbers is very different. GLP-1 vials often hold far more milligrams than a 5 mg BPC-157 vial, so the concentration and draw volume land in unfamiliar territory. MyPeptideMatch and Outliyr both name semaglutide and tirzepatide explicitly, which makes them safer starting points for GLP-1 reconstitution.
If I want to run BPC-157 and CJC-1295 at the same time, which tool handles both without switching pages?
Outliyr covers both in a single tool alongside several other compounds. PeptideFox covers more than 30 peptides and also optimizes BAC water volume for cleaner unit draws, which helps when you are pulling different syringes back to back and want whole or half units on each one.
Is peptidereconstitutecalculator.com worth using if I ever move beyond BPC-157?
Probably not on its own. It is single-purpose by design. Once you add a second compound, something like PeptideFox or the FormBlends calculator will save you from opening multiple tabs. Keep the BPC-157-only tool bookmarked as a quick cross-check, but do not build a multi-compound protocol around it.
What is the point of peptides.org dosage charts if they are not interactive calculators?
They tell you whether the number a calculator produced is even plausible. If a tool outputs 2,500 mcg as your BPC-157 dose and the research-literature range sits at 250 to 500 mcg per injection, the chart flags that something went wrong upstream, probably a unit entry error. Think of it as a floor-and-ceiling reference, not a dosing guide.
Sources
- U-100 syringe specifications: standard insulin syringe labeling (100 units per 1 mL)
- BPC-157 and TB-500 dose ranges: published research summaries at peptides.org
- PeptideFox feature description: peptidefox.com public tool page
- MyPeptideMatch compound list: mypeptidematch.com public tool page
- PeptideDeck interface: public web tool
- LeadWest Medical calculator: leadwestmedical.com public calculator page
- Outliyr calculator: outliyr.com public tool page
- FormBlends calculator: FormBlends web app and mobile app public feature documentation
