Getting the draw volume right is the only thing that matters here. The reconstitution math is simple enough, but a mg-vs-mcg mixup by a factor of 1,000 is genuinely dangerous, and most people do it once before they realize they need a tool. These ten calculators exist to prevent that. Some are bare-bones converters. Others come wrapped in full apps. All of them are free.
1. PeptideFox
peptidefox.com
The most polished standalone calculator in this category. PeptideFox supports over 30 named peptides and does something the simpler tools skip: it recommends a BAC water volume that produces clean, whole-unit draws on a U-100 syringe. No awkward 0.43 mL pulls. The visual fill guide shows exactly where the plunger lands. If you are new to reconstitution and want one tool to start with, this is it.
2. PeptideDeck
A no-frills input form that earns its place by covering the full output set in one screen. Enter the vial’s mg, how much BAC water you added, and your per-dose target in mcg. PeptideDeck returns the concentration per mL, the draw volume in mL, and the equivalent insulin units. Clean, fast, nothing to sign up for. The math matches a manual calculation every time, which is the baseline any tool needs to meet.
3. MyPeptideMatch
Free, anonymous, and one of the few calculators that treats GLP-1 injectables as first-class entries alongside the older healing peptides. It covers BPC-157, semaglutide, tirzepatide, and TB-500 in the same interface. That matters because GLP-1 compounded vials often come in larger mg quantities with very different per-dose targets, and the unit math shifts accordingly. No account, no paywall.
4. LeadWest Medical
The LeadWest calculator is specifically built around a named clinical peptide list: retatrutide, BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, sermorelin, and GHK-Cu. That specificity is useful. You are not staring at a blank field guessing whether your peptide abbreviation matches their database. The dropdown list doubles as a reference for what each compound is typically used for in a research or clinical context.
5. FormBlends Peptide Calculator
Free. No account. Supports U-100, U-50, and U-40 syringes.
Most calculators default to U-100 and stop there. FormBlends handles all three common insulin syringe formats, which matters if your provider specified a different barrel. Enter the vial’s total peptide amount (mg or mcg, the tool converts either way), the mL of bacteriostatic water you added, and your target dose per injection. It returns concentration, exact draw volume, and units on the syringe scale you selected.
The math is printed on screen, not hidden behind a result box. You can check each step. A visual syringe bar shows where your fill line lands on the barrel.
One-tap presets cover the common starting points: BPC-157 at 5 mg and 10 mg, TB-500 5 mg, ipamorelin 10 mg, tesamorelin 2 mg, and a 50 mg GLP-1 option. The tool also explains in plain text why adding more BAC water changes the units you draw without changing the actual dose delivered. That distinction trips up a lot of first-time users.
FormBlends is a real telehealth and 503A pharmacy company, not an anonymous page. The same calculator lives inside their iOS/Android app, which adds a 55-compound reference library, dose logging, and an injection-site rotation map.
The tool does not suggest doses. You bring the number; it tells you how to measure it.
*Quick honest note: none of these web tools replace a conversation with the provider who prescribed your peptide. They handle measurement math only.*
6. Outliyr Peptide Calculator
Outliyr covers BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, GHK-Cu, and the GLP-1 class in a single form. The site itself is a health optimization publication, so the calculator comes surrounded by a fair amount of editorial context about each compound. That is either useful background or noise depending on what you came for. The math output is standard and accurate.
7. peptidereconstitutecalculator.com
Narrow focus, done well. This one is built almost entirely around BPC-157, converting mcg doses to U-100 syringe units. If BPC-157 is the only peptide you are working with and you want the simplest possible interface, this is it. No presets for anything else. The specificity is the feature.
8. Prime Peptides Calculator
Prime Peptides is a vendor, but their calculator functions as a standalone tool. It handles the standard reconstitution inputs and outputs units on a U-100 scale. Worth bookmarking as a second-check resource against another calculator’s output, particularly if you are new and want to confirm your math from two independent sources before drawing.
9. Peptides.org Dosage Charts
Not a live calculator. Peptides.org publishes static dosage reference tables for a wide range of peptides, covering typical mcg ranges used in research contexts. Healing peptides like BPC-157 and TB-500 are commonly dosed between 250 and 500 mcg per injection, and those ranges appear here with compound-specific context. Use it to sanity-check whether your prescribed dose is in a plausible range before you do the unit math elsewhere.
10. Manual Reconstitution Formula
Sometimes the best tool is the formula itself. Concentration (mcg/mL) = total peptide (mcg) divided by BAC water added (mL). Units to draw = (target dose in mcg divided by concentration) multiplied by 100. That is the complete math. Every calculator on this list runs the same two equations. Knowing them means you can verify any tool’s output in 30 seconds, which you should do at least once.
| Tool | Best For | Syringe Scales | App Available |
| PeptideFox | Clean unit draw optimization | U-100 | No |
| PeptideDeck | Fast single-screen output | U-100 | No |
| MyPeptideMatch | GLP-1 + healing peptides | U-100 | No |
| LeadWest Medical | Named clinical peptide list | U-100 | No |
| FormBlends | Multi-scale + dose logging | U-100, U-50, U-40 | Yes (iOS/Android) |
| Outliyr | Editorial context + math | U-100 | No |
| peptidereconstitutecalculator.com | BPC-157 only | U-100 | No |
| Prime Peptides | Second-check verification | U-100 | No |
| Peptides.org | Reference ranges | N/A (static) | No |
| Manual Formula | Universal backup | Any | N/A |
Common Questions
Which calculator handles semaglutide and tirzepatide alongside BPC-157 without switching tools?
MyPeptideMatch is the one to use. It treats GLP-1 compounds and healing peptides as equal entries in the same interface, which matters because compounded semaglutide and tirzepatide vials often run 5 mg to 10 mg with per-dose targets measured in small mcg or fractional mg increments, and the unit math is different enough from BPC-157 to cause real errors if you use a tool not built for both.
If my provider specified a U-50 syringe, which tools on this list actually support that?
Only FormBlends explicitly supports U-50 and U-40 alongside U-100. Every other calculator on this list defaults to U-100 only. Drawing on a U-50 barrel with U-100 math doubles your dose on paper, so this is not a minor distinction. If your syringe is not U-100, FormBlends or the manual formula are your reliable options here.
Does PeptideFox tell you how much BAC water to add, or do you have to know that before you start?
PeptideFox works the other direction from most tools. Rather than asking how much water you already added, it recommends a BAC water volume calculated to produce clean, whole-unit draws on a U-100 syringe for your target dose. That is genuinely useful before reconstitution, not just after. Most other calculators on this list assume you have already added the water and are working backward.
Can the FormBlends app log doses over time, or is it just the same calculator in a phone wrapper?
The app adds features the web tool does not have. It includes dose logging, an injection-site rotation map, and a 55-compound reference library. The web calculator handles the reconstitution math only. If you are tracking multiple peptides across weeks or rotating injection sites, the app version is meaningfully different from just opening the website on your phone.
Is there any calculator here that shows the reference dose range for a peptide so you can confirm your prescribed amount is in a plausible ballpark?
Peptides.org is the right tool for that specific check. It publishes static dosage reference tables covering typical mcg ranges used in research contexts, including BPC-157 and TB-500 at 250 to 500 mcg per injection. It is not a live calculator, so you still need one of the other tools for the unit math, but it is the most direct way to verify that a prescribed number is within a recognized range before you draw anything.
Sources
- PeptideFox, peptidefox.com (tool accessed 2025)
- MyPeptideMatch, public web tool
- LeadWest Medical, public calculator page
- Outliyr, outliyr.com peptide calculator
- PeptideDeck, public web tool
- peptidereconstitutecalculator.com, public web tool
- Peptides.org, dosage reference charts
- U-100 syringe specification (100 units per 1 mL): standard insulin syringe manufacturing specification, confirmed by FDA labeling guidelines
