Stack & Blend Calculator

Free Peptide Stack & Blend Calculator – Multi-Peptide Vial Math & Syringe Units (2026)

Free Peptide Stack & Blend Calculator – Multi-Peptide Vial Math & Exact Syringe Units

Last updated August 2026 · Free · No signup required · Mobile-friendly

This free peptide stack and blend calculator solves the most common multi-peptide problem: you have two or more peptides in the same vial (or you plan to blend them yourself) and you need to know exactly how many micrograms of each compound you are drawing with every unit on the syringe. Enter each peptide’s milligram amount, the total bacteriostatic water volume, and your target draw — the tool returns precise per-peptide concentrations and doses.

On this page: The calculator How stack math works Worked examples Common research stacks Blending best practices FAQ

Peptide Stack & Blend Calculator

Add each peptide in the blend, set total BAC water and desired draw volume, then calculate.

Changing units auto-updates the mL field (1 unit = 0.01 mL).

How peptide stack & blend math works

When two or more lyophilized peptides are reconstituted in the same volume of bacteriostatic water, each peptide forms its own independent concentration. The water is shared, but the milligrams of each compound are not. The key formulas are:

Concentration of Peptide A (mg/mL) = mg of A ÷ total BAC water (mL)
Concentration of Peptide B (mg/mL) = mg of B ÷ total BAC water (mL)

Dose of A in a given draw (mcg) = Concentration A (mg/mL) × draw volume (mL) × 1000
Dose of B in a given draw (mcg) = Concentration B (mg/mL) × draw volume (mL) × 1000

Units on U-100 syringe = draw volume (mL) × 100

Because every peptide in the vial experiences the exact same draw volume, the ratio of the peptides in each injection remains constant and equal to the ratio of their original milligram amounts. This is why pre-blended “stack” vials and carefully measured home blends can deliver predictable multi-peptide doses from a single syringe pull.

Worked examples

Example 1 – Classic BPC-157 + TB-500 blend
BPC-157: 5 mg
TB-500: 5 mg
Total BAC water: 2 mL
Desired draw: 0.1 mL (10 units)

Concentration BPC = 5 ÷ 2 = 2.5 mg/mL → 250 mcg in 0.1 mL
Concentration TB-500 = 5 ÷ 2 = 2.5 mg/mL → 250 mcg in 0.1 mL
Result: every 10-unit injection delivers 250 mcg of each peptide.
Example 2 – CJC-1295 + Ipamorelin (common research ratio)
CJC-1295: 2 mg
Ipamorelin: 5 mg
Total BAC water: 2.5 mL
Desired draw: 0.1 mL (10 units)

CJC concentration = 2 ÷ 2.5 = 0.8 mg/mL → 80 mcg per 0.1 mL
Ipamorelin concentration = 5 ÷ 2.5 = 2.0 mg/mL → 200 mcg per 0.1 mL
Result: 10 units = 80 mcg CJC-1295 + 200 mcg Ipamorelin.
Example 3 – Three-peptide “Wolverine-style” research blend
BPC-157: 5 mg
TB-500: 5 mg
GHK-Cu: 50 mg
Total BAC water: 3 mL
Desired draw: 0.15 mL (15 units)

BPC = 5 ÷ 3 ≈ 1.667 mg/mL → ≈ 250 mcg
TB-500 = 5 ÷ 3 ≈ 1.667 mg/mL → ≈ 250 mcg
GHK-Cu = 50 ÷ 3 ≈ 16.67 mg/mL → ≈ 2500 mcg (2.5 mg)
Result: 15 units delivers the above amounts of each component.

Common research peptide stacks and typical ratios

The following table lists frequently discussed research combinations. These are educational examples only — not recommendations. Always verify the exact milligram amounts on your own vials.

Stack name (research) Typical components Common vial amounts Typical water
BPC + TB-500 BPC-157 + TB-500 5 mg + 5 mg or 10 mg 2–3 mL
CJC + Ipamorelin CJC-1295 (no DAC) + Ipamorelin 2 mg + 5 mg 2–2.5 mL
GHRP blend GHRP-2 + GHRP-6 or Ipamorelin 5 mg + 5 mg 2 mL
Healing + copper BPC-157 + GHK-Cu 5 mg + 50 mg 2–3 mL
Triple healing BPC-157 + TB-500 + GHK-Cu 5 + 5 + 50 mg 3 mL

Best practices when blending peptides

  1. Reconstitute one peptide at a time when possible. If you are creating a custom blend from separate vials, dissolve each peptide in a small portion of the total BAC water first, then combine the solutions. This reduces the risk of incomplete dissolution.
  2. Use the same bacteriostatic water source for the entire blend so pH and preservative concentration remain consistent.
  3. Never shake. Gentle swirling is sufficient. Vigorous shaking can damage peptide structure, especially longer-chain peptides.
  4. Label thoroughly. Write every peptide name, its milligram amount, the total water volume, the resulting concentration of each, and the reconstitution date on the vial.
  5. Store refrigerated and protected from light. Most blended solutions remain stable for 28–30 days under proper conditions, but the shortest stability of any single component becomes the limiting factor for the whole blend.
  6. Confirm compatibility. Not every peptide combination is chemically ideal in the same solution. When in doubt, keep peptides in separate vials and draw them sequentially into the same syringe immediately before use.
Pro tip: If you prefer to keep peptides separate but still inject them together, you can draw the calculated volume of each reconstituted peptide into the same syringe one after another. The Stack & Blend Calculator still helps you determine the correct volume for each component so the final syringe contains the intended microgram amounts.

Why a dedicated stack calculator is useful

Single-peptide reconstitution calculators assume one compound per vial. As soon as a second or third peptide is present, the simple “vial mg ÷ water” formula must be applied independently to each component while the draw volume remains shared. Manual calculation quickly becomes error-prone, especially when the peptides have very different potencies (for example a 5 mg healing peptide blended with a 50 mg copper peptide). This calculator eliminates the arithmetic risk and shows the exact microgram yield of every peptide in the draw you actually plan to use.

Limitations and important considerations

  • The calculator assumes complete and uniform dissolution of every peptide.
  • It does not account for possible chemical interactions, precipitation, or pH shifts that can occur when certain peptides are mixed.
  • Dead-space volume in the syringe hub is ignored; for very small draws this can introduce a small absolute error.
  • Results are only as accurate as the milligram amounts and water volume you enter. Always double-check the labels on your vials.

Frequently Asked Questions

What is the difference between a “stack” and a “blend”? ▼
In everyday research language the terms are often used interchangeably. A blend usually means two or more peptides reconstituted in the same vial. A stack can mean the same thing or it can mean taking multiple peptides (possibly from separate vials) as part of the same protocol. This calculator handles both situations.
Can I add more than three peptides? ▼
Yes. Use the “Add another peptide” button to include as many components as you need. The math remains the same regardless of the number of peptides.
Does the order of peptides in the list matter? ▼
No. Each peptide’s concentration is calculated independently from its own milligram amount and the shared water volume. Order has no effect on the results.
What if I want a specific microgram dose of only one peptide in the blend? ▼
Adjust the draw volume until the desired peptide reaches the target microgram amount. The other peptides will scale proportionally. You can also keep the peptides in separate vials and draw different volumes of each into the same syringe.
Is it better to buy pre-blended vials or blend them myself? ▼
Pre-blended vials save time and reduce handling, but they lock you into a fixed ratio. Blending from separate vials gives full control over the ratio and lets you adjust one peptide without affecting the others. Both approaches are used in research settings; the calculator works for either.
How long does a multi-peptide blend last after reconstitution? ▼
Most research peptides remain stable for approximately 28–30 days when reconstituted with bacteriostatic water and stored refrigerated (2–8 °C) and protected from light. The component with the shortest known stability determines the practical shelf life of the entire blend.
Can this calculator be used for GLP-1 dual or triple agonists? ▼
If the product is a single molecular entity (for example tirzepatide or retatrutide) it is not a blend and should be handled with the single-peptide reconstitution or dosage calculators. If you are intentionally combining separate GLP-1-related research compounds in one vial, this stack calculator applies.
Is this medical or dosing advice? ▼
No. This tool performs arithmetic only. It does not recommend peptides, ratios, doses, or protocols. Always consult qualified professionals and follow the documentation supplied with your research materials.
Important: For general education and research reference only — not medical advice or a treatment recommendation. Peptides are not a substitute for care from a licensed provider. Talk to a qualified healthcare professional before you start, stop, or change any peptide, medication, or supplement.

Free peptide stack & blend calculator · No registration · Updated August 2026 · Accurate multi-peptide math for research use

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