10 Peptide Dosage Calculators Worth Bookmarking Before You Reconstitute Anything

The most common mistake people make with BPC-157 dosing has nothing to do with the peptide itself. It’s a unit conversion error: confusing milligrams with micrograms and drawing 1,000 times the intended dose. A 5 mg vial contains 5,000 mcg. Miss that decimal point and the math goes badly wrong fast. That’s the specific problem most of the tools below were built to prevent.

1. FormBlends Peptide Calculator

Best pick for someone reconstituting BPC-157 for the first time and wanting to see exactly why the syringe fill lands where it does.

You enter three numbers: the vial size in mg, the volume of bacteriostatic water you added in mL, and your target dose in mcg. The tool outputs the concentration per mL, the exact units to draw on your syringe, and the total number of doses left in the vial. It also handles the mg-to-mcg conversion automatically, which removes the most dangerous step in the process.

What makes it stand out from most anonymous peptide pages is that the underlying arithmetic is printed on screen. You can check every step. There’s a visual syringe fill bar that shows exactly where the plunger should stop. It defaults to U-100 insulin syringes but also handles U-50 and U-40. One-tap presets cover BPC-157 (5 mg and 10 mg vials), TB-500 5 mg, ipamorelin 10 mg, tesamorelin 2 mg, and a GLP-1 50 mg option.

The calculator is free and requires no account. It also lives inside the FormBlends mobile app (iOS and Android), where it’s paired with a 55-compound reference library, injection-site rotation mapping, and dose logging. FormBlends is a real telehealth and 503A pharmacy company, not an anonymous side project.

One thing to understand up front: the tool does not tell you what dose to take. You enter the dose your provider prescribed and it tells you how to measure it. That framing matters.

2. PeptideFox

At peptidefox.com, the library runs to more than 30 peptides. The differentiator here is a BAC water volume optimizer: it suggests how much water to add so your target dose lands on a clean, even number of syringe units. Harder to misread. Comes with a visual guide showing syringe marks.

3. PeptideDeck

Three inputs: mg in the vial, mL of BAC water, and target mcg per dose. Three outputs: concentration, draw volume in mL, and the insulin unit equivalent. Clean and fast. Good for people who already understand the math and just want the number.

4. MyPeptideMatch

Free, no login. Handles semaglutide, tirzepatide, BPC-157, TB-500, and several other injectable compounds. Useful if you’re managing more than one compound at a time and want a single page that doesn’t require switching tools.

5. LeadWest Medical Calculator

The compound list here includes retatrutide, BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, sermorelin, and GHK-Cu. The breadth is the point. If your protocol combines a healing peptide with a growth hormone secretagogue, this one handles both without needing a second tab.

6. Outliyr Peptide Calculator

Similar compound list to LeadWest: BPC-157, TB-500, ipamorelin, CJC-1295, tesamorelin, GHK-Cu, and GLP-1 class compounds. Outliyr is primarily a health optimization publication, and the calculator sits inside that editorial context, which some users find helpful for cross-referencing background information.

7. peptidereconstitutecalculator.com

BPC-157-specific. Does one thing: converts your target mcg dose to insulin units on a U-100 syringe given your chosen BAC water volume. Narrow scope, but that focus means fewer inputs and less room for confusion if BPC-157 is the only peptide you’re working with.

8. peptides.org Dosage Charts

Static reference charts rather than a click-and-calculate tool. Covers common dosing ranges for several peptides. Worth keeping open alongside a reconstitution calculator as a sanity check on whether the numbers your provider gave you fall within published research ranges.

9. Prime Peptides Calculator

Tied to the Prime Peptides product line but functions as a general reconstitution tool. Covers the standard inputs and outputs. Useful as a backup if another tool is loading slowly.

10. A Spreadsheet You Build Yourself

Genuinely underrated. The reconstitution formula is the same for every lyophilized peptide: concentration (mcg/mL) = vial content (mcg) divided by BAC water added (mL). Draw volume (mL) = target dose (mcg) divided by concentration. Units on a U-100 syringe = draw volume multiplied by 100. Build it once in Google Sheets and it works forever, for any peptide, at any vial size.

Tool	Peptides Covered	Syringe Types	App Available
FormBlends Peptide Calculator	BPC-157, TB-500, ipamorelin, tesamorelin, GLP-1, others	U-100, U-50, U-40	Yes (iOS/Android)
PeptideFox	30+	U-100	No
PeptideDeck	Any lyophilized	U-100	No
MyPeptideMatch	BPC-157, TB-500, GLP-1 class	U-100	No
LeadWest Medical	8+ named compounds	U-100	No
peptidereconstitutecalculator.com	BPC-157	U-100	No

Read This Before Touching Any of These Tools

None of these tools prescribe a dose. They convert a dose you already have, from a provider who examined you, into a measurable syringe volume. Using a calculator correctly does not substitute for a qualified prescriber reviewing your specific situation, your vial lot, your syringe type, and your reconstitution technique. If something in the output looks wrong, stop and verify the inputs before drawing anything.

Common Questions

Does the FormBlends calculator work if my vial is labeled in mg but my prescription is written in mcg?

Yes, and that mismatch is exactly what it’s designed for. Enter the vial size in mg, and the tool converts internally before calculating your draw volume. You type your prescribed mcg dose directly into the dose field. The on-screen math shows the conversion step so you can confirm nothing shifted between what your provider wrote and what you’re about to draw.

If I use peptidereconstitutecalculator.com for BPC-157, do I still need a separate tool for TB-500 if my protocol includes both?

Yes. That site handles BPC-157 only. For TB-500 alongside BPC-157, tools like LeadWest Medical, MyPeptideMatch, or FormBlends cover both compounds in one session without requiring you to switch pages or re-enter your BAC water volume separately for each vial.

Can PeptideFox’s BAC water optimizer change my dose, or does it only affect the syringe draw volume?

It only affects draw volume. The optimizer adjusts how much bacteriostatic water you add so that your prescribed mcg dose lands on a whole, easy-to-read number of syringe units. Your actual dose stays exactly what your provider set. The change is purely mechanical, making the measurement less likely to be misread on the syringe barrel.

Are any of these calculators connected to a licensed pharmacy, or are they all independent web tools?

FormBlends is publicly listed as a telehealth and 503A compounding pharmacy company, and its calculator is part of that platform. The others on this list, including PeptideFox, PeptideDeck, peptidereconstitutecalculator.com, and Outliyr, appear to be independent tools without a licensed pharmacy attached. That distinction matters if you want the calculator tied to a verified clinical source.

Is building a Google Sheets reconstitution calculator actually safe, or is it too easy to introduce a formula error?

It’s safe if you verify the three formulas before you use it on a real vial. The math is simple division and multiplication, not nested logic. Write the formulas out by hand first, check them against a known example from one of the established tools above, and lock the formula cells once confirmed. A verified spreadsheet carries no more error risk than any other calculator.

Sources

• U-100 insulin syringe specifications: standard published by syringe manufacturers and verified by pharmacist references
• Reconstitution mathematics: general pharmaceutical compounding references covering lyophilized injectable preparation
• peptides.org: public dosage reference charts
• peptidefox.com: tool features as listed on the public site
• FormBlends mobile app: iOS/Android public app store listings