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Peptide reconstitution & dosage calculator

Your vial, your amounts, your syringe math. Calculate a clear result, then bring it with you in the free app.

Clarity, down to the last unit.

01
Calculate your draw
Use the amounts from your instructions.
02
Keep it in your pocket
Save your vial and track your routine. Free.

Calculated in your browser. Transfer only when you choose.

Dilution arithmetic only. Use the dose and water volume from your product instructions or licensed clinician. This is not medical advice.

A little math. All made clear.

Live calculator

Which peptide? Optional

The math works without a name. Add one to carry this vial into the app.

Target amount

From your label or clinician. Switching units converts your amount.

Peptide in your vial

Water volumemL

Custom mL

Use your instructed water volume. Presets are math shortcuts, not preparation advice.

Water volume—mL

Enter your values above

Illustration full at 3 mL

Your U-100 draw—units

Your result appears here

U-100 syringe · 1 mL scaleIllustration only

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From one calculation to your whole routine.

Save vials, set reminders, and log doses in one free iPhone app. No subscription.

Enter valid amounts above to continue.

Dilution math only, not medical advice. Follow your product instructions or licensed clinician. Vial visual is not to scale.

Ad measurement choices

How to calculate peptide dosage from a vial

Five steps from label to syringe units, using the calculator above.

Is this calculator for you?

Use it when you already have a vial size and target amount from your label, clinic, or protocol and need the syringe math.

It cannot choose a peptide, invent a dose, or replace preparation guidance. New to peptides? Start with the beginner's research guide.

1
Confirm the target amount from your label, clinic, or protocol (mcg or mg)
Do not invent a dose. The calculator starts from a number you already have.
2
Read the peptide amount printed on the vial (mg)
Do not guess from a common size shortcut. The vial label is the source.
3
Enter both values
Select a water-volume option to see the matching U-100 units.
4
If your instructions name a water volume, enter that volume
Use the Custom mL field beside the water shortcuts. Decimal volumes are supported.
5
Draw to the units shown on a U-100 scale
Label the vial with concentration and date per your own process.

Illustrative arithmetic only. Follow product instructions or a licensed clinician when they differ.

Calculator by peptide

Open a named calculator and confirm the vial size printed on your label. Common-size shortcuts still need to match your product. You can also browse the full peptide library.

BPC-157 GHK-Cu Retatrutide Semaglutide TB-500 Tirzepatide

Browse all peptide calculators

Peptide reconstitution chart

These examples show how vial amount and liquid volume determine concentration. Take the dose and liquid volume from your instructions.

Concentration equals the amount printed on the vial divided by the liquid volume. Follow your product documentation or licensed-professional instructions, then use the chart to check the arithmetic.

Example peptide vial amounts, liquid volumes, and resulting concentrations
Vial label	Liquid volume	Concentration
5 mg	1 mL	5 mg/mL
5 mg	2 mL	2.5 mg/mL
10 mg	1 mL	10 mg/mL
10 mg	2 mL	5 mg/mL
20 mg	2 mL	10 mg/mL

How to reconstitute a peptide

A plain-English walkthrough, for research and educational purposes only.

1
Confirm the target amount
Use the amount and mg or mcg unit from your label, prescription, protocol, or professional guidance. Named calculator pages leave this field blank until you enter it.
2
Check the vial label
Enter the total peptide amount printed on the vial. Common-size shortcuts are optional and are not a substitute for checking the label in front of you.
3
Review the dilution scenarios
Select a water-volume shortcut to see its U-100 conversion, or enter your instructed volume in Custom mL. A displayed water volume is arithmetic, not a preparation recommendation.
4
Use instructed values when they differ
If your product instructions or licensed professional specify a BAC-water volume, enter it in Custom mL and follow that value instead of a displayed arithmetic option. This calculator converts only on a U-100 scale.
5
Label and store the vial
Write down the concentration and the date you mixed it, then follow the storage guidance that came with the product.

Questions people ask

The reconstitution details that trip most people up.

How much bacteriostatic water should I use?

The calculator cannot determine how much bacteriostatic water you should use. It shows the U-100 arithmetic for the selected water volume. Follow the volume on your label, protocol, or licensed-professional instructions and enter that value in Custom mL.

How many units do I draw on an insulin syringe?

Units depend on the target amount, vial size, and BAC-water volume. The calculator uses a U-100 scale, where 100 units equals 1 mL. Confirm that the syringe in your hand uses that scale and can hold the displayed volume.

How do I convert mcg to units?

First convert mcg to mg by dividing by 1,000. Then divide that mg amount by the concentration in mg per mL to get mL, and multiply by the syringe units per mL. The calculator does this automatically.

How long does reconstituted peptide last?

Storage life varies by compound, sterility, handling, and supplier instructions. Many research peptides are stored refrigerated after mixing, but you should follow the product documentation and consult a qualified professional for your situation.

How do you calculate a peptide dose?

This calculator does not create a dose. It starts with a target amount you already have, divides the vial amount by the BAC-water volume to get concentration, then converts that target into mL and syringe units. Named calculator pages leave the target field blank until you enter it.

How do I use a peptide calculator?

Enter the target amount from your instructions and the peptide amount printed on the vial. The calculator compares supported whole-mL arithmetic options and shows the matching U-100 units. If you already have an instructed BAC-water volume, enter it directly in the same calculator card. Do not use these U-100 results for another syringe scale.

Does this calculator work for tirzepatide and semaglutide?

The same dilution equation works for compatible vials once you enter the target amount and the vial size from your label. Product forms and instructions vary, so confirm that reconstitution is required and enter the instructed BAC-water volume whenever your product documentation or licensed professional provides one.

What does a peptide reconstitution chart show?

A peptide reconstitution chart calculates concentration from a stated vial amount and liquid volume. Take the dose and liquid volume from your product documentation or a licensed professional, then use the chart to check the arithmetic.

Is there a free peptide dosage calculator with no signup?

Yes. The calculation runs in your browser without an account. If you select a peptide and choose to continue in the app, we create a temporary secure link containing your entered values so you can review them on your iPhone before saving.

Does it show U-100 syringe units?

Yes. Results are on a U-100 scale so you can read the mark on a standard insulin syringe barrel.

Can I embed this calculator on my site?

Yes. Use the partner embed block on this page and keep the credit link so readers can open the full calculator and methodology.

Is this medical advice?

No. Dilution arithmetic only. Follow your product instructions or licensed clinician.

Should I trust AI for peptide dosage math?

No. Chat assistants and AI tools can misstate units, confuse vial sizes, swap mcg for mg, or hallucinate numbers. Use a reconstitution calculator as a tool, then verify the inputs (vial size, target amount, units) and the unit conversion yourself before relying on the result. Work through one compound at a time to reduce mix-ups. This is not a dosing recommendation — it is a reminder that arithmetic from any source, including AI, needs a sanity check.

This calculator is for research and educational purposes. It does not diagnose, treat, prescribe, or replace guidance from a licensed professional. Always follow the instructions provided with your product.

See how the math works

Our public methodology covers every conversion step, assumptions, privacy, and when a result should not be used.

Read the methodology

How this compares to tracker apps

This free calculator converts two values into syringe units without an account. Dose logs, reminders, and verified setups are available in The Peptide App when you want to keep track over time.

Explore the free peptide app

Supporting guidance

Keep the arithmetic separate from product instructions. Use the public formula, step-by-step reconstitution guide, and storage checklist when you need more than the conversion result.

How to reconstitute peptides Formula & syringe units Reconstitution context Storage & travel checklist Compare iPhone calculator apps

Want to put this calculator on your site?

Paste this complete block into your site. Keep the credit link with the iframe so readers can open the full calculator and methodology. See the full partner embed kit for domain setup and named-peptide options.

<iframe src="https://www.thepeptide.app/embed/calculator?ref=TARGET_DOMAIN"
        width="100%" height="840" style="border:0;width:100%" loading="lazy"
        referrerpolicy="strict-origin-when-cross-origin"
        title="Peptide reconstitution calculator"></iframe>
<script>
(function () {
  var frame = document.currentScript.previousElementSibling;
  if (!frame || frame.tagName !== "IFRAME") return;
  window.addEventListener("message", function (event) {
    if (event.origin !== "https://www.thepeptide.app" || event.source !== frame.contentWindow) return;
    var data = event.data;
    if (!data || data.type !== "the-peptide-app:calculator-height") return;
    var height = Math.ceil(Number(data.height));
    if (Number.isFinite(height) && height >= 480 && height <= 1200) {
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}());
</script>
<p>Calculator by <a href="https://www.thepeptide.app/calculator" target="_blank" rel="noopener">The Peptide App peptide calculator</a></p>

Peptide reconstitution & dosage calculator

A little math. All made clear.

From one calculation to your whole routine.

How to calculate peptide dosage from a vial

Is this calculator for you?

Confirm the target amount from your label, clinic, or protocol (mcg or mg)

Read the peptide amount printed on the vial (mg)

Enter both values

If your instructions name a water volume, enter that volume

Draw to the units shown on a U-100 scale

Calculator by peptide

Peptide reconstitution chart

How to reconstitute a peptide

Confirm the target amount

Check the vial label

Review the dilution scenarios

Use instructed values when they differ

Label and store the vial

Questions people ask

See how the math works

How this compares to tracker apps

Supporting guidance