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Peptide calculators that tell you exactly what to draw.

Peptide vials do not come with instructions. Enter your vial size, water volume, and desired dose. The calculator gives you exact syringe units, shows you where to draw on a visual syringe, and tells you how many doses your vial contains without making you guess.

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This free peptide reconstitution calculator works for every injectable peptide, including semaglutide, retatrutide, tirzepatide, BPC-157, TB-500, and CJC-1295 + ipamorelin. Enter your vial concentration, bacteriostatic water volume, and target dose to get exact syringe units with a visual fill indicator.

Peptide Dosage Calculator

?This calculator figures out how much liquid to draw into your syringe based on how much peptide is in your vial and how much water you added. Just fill in the boxes below!

Enter your vial details below — results update instantly.

Popular Peptides (tap to auto-fill)?If you're using one of these common peptides, tap it to pre-fill the typical vial size, water amount, and starting dose. You can still adjust everything afterwards.
mg
mL
mg
That's 250 mcg
units
Your Results ?These are your calculated results. The two most important numbers are "Draw to" (how many units to pull on your syringe) and "Volume" (how many mL that is). They mean the same thing, just measured differently!
Concentration?How much peptide is in each mL of liquid after mixing. Higher concentration = less liquid per dose.
2.50mg/mL
Draw To?This is the line you pull back to on your syringe. Line up the black rubber stopper with this number on your syringe barrel.
10.0IU
Volume?The same measurement as "Draw to" but in milliliters instead of syringe units. Some people find mL easier to understand.
0.100mL
Doses / Vial?How many times you can dose from this single vial before it runs out at your current dose amount.
20
Your syringe fill level?This shows what your syringe would look like filled to the correct dose. The green liquid level rises to match your dose. The arrow shows exactly where to stop drawing.
Draw to 10 IU
This vial will give you 20 doses at this amount
In Plain English

Add 2 mL of bacteriostatic water to your 5 mg vial. To get a 0.25 mg (250 mcg) dose, draw your syringe to the 10 unit mark. You'll get about 20 doses from this vial.

Want to see all peptides at a glance? Get the free cheat sheet and keep 25 peptides organized by goal on one printable page.

How to Reconstitute a Peptide?A quick step-by-step guide to mixing a lyophilized peptide vial with bacteriostatic water before dosing.

Use the calculator first, then follow these steps.

1

Gather Everything First

Have your peptide vial, bacteriostatic water, insulin syringe, and alcohol pads ready before you start. Wash your hands and work on a clean surface.

2

Choose Your Water Volume

Use the calculator above to decide how much BAC water to add. A common setup is 2 mL for a 5 mg vial because it keeps dosing easy to measure. The water changes concentration, not the total amount of peptide in the vial.

3

Clean the Stoppers and Add Water Slowly

Wipe both vial tops with alcohol. Draw the BAC water into the syringe, then let it run slowly down the inside wall of the peptide vial instead of spraying the powder directly.

4

Mix Gently

Swirl the vial or roll it between your hands until the powder dissolves. Do not shake it hard. The liquid should be clear when it is fully mixed.

5

Draw Your Dose and Refrigerate

Use a fresh syringe, draw to the mark shown in the calculator, and put the vial back in the refrigerator. Mixed peptides are usually stored at 36-46°F (2-8°C).

Peptide Pages and Tools

Start with the highest-value tool, then move deeper into guides, comparisons, and stack planning.

Explore Next

Find the right page, tool, or comparison for what you want to solve next.

Browse live pricing, protocol planning, side-by-side comparisons, and practical reference pages without digging through unrelated links.

Compare PricesLive supplier board Protocol BuilderWeekly planning tool Half-Life ChartDosing frequency reference Units to mLQuick converter

Most-Used Peptide Pages

These are the compounds people usually check first when they need dosing math, mixing guidance, or a quick starting reference.

Retatrutide →Weekly dose calculator and mixing guide for retatrutide. Semaglutide →Semaglutide dose math, mixing steps, and weekly schedule basics. Tirzepatide →Tirzepatide calculator with simple reconstitution and dosing help. BPC-157 →Quick BPC-157 mixing math with common dose ranges.
TB-500 →TB-500 dose and mixing reference for common cycle setups. CJC-1295 →CJC-1295 dose calculator with DAC and no-DAC basics. Ipamorelin →Ipamorelin dose math with straightforward pairing notes. GHK-Cu →GHK-Cu mixing guide and common dose reference.
PT-141 →PT-141 timing, dosing, and storage in one place. AOD-9604 →AOD-9604 mixing guide with common daily dose ranges. MOTS-c →MOTS-c dose calculator with typical cycle and storage notes.

Comparisons & Stacks

Use these when you are deciding between compounds or checking how common stack setups are usually structured.

Semaglutide vs Tirzepatide →Quick comparison of dosing, cadence, and use case. Retatrutide vs Semaglutide →Side-by-side look at mechanism, dosing, and tradeoffs.
Retatrutide vs Tirzepatide →Compare weekly dosing, strength, and common differences. BPC-157 + TB-500 →Overview of a common repair-focused stack.
CJC-1295 + Ipamorelin →Common timing and dose structure for this stack.

References & Tips

These are the utility pages and practical reference guides people usually need after the main dose math is finished.

Half-Life Chart →Check dosing frequency and compound timing at a glance. Units to mL →Translate syringe units into liquid volume without second-guessing the math.
mcg to mg Converter →Convert milligrams and micrograms without second-guessing the math. Injection Sites →Simple guide to common subcutaneous injection spots.
Storage Guide →Fridge, light, and handling basics for mixed peptides.
Supplier Comparison Compare Peptide Prices Filter by peptide, supplier, vial size, and max price without leaving the homepage. Expand when you want it, collapse when you do not. 0 listings 0 suppliers Expand
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What You'll Need (Besides the Peptide)

These are the same supplies used in reconstitution guides and clinic-style protocols.

Affiliate links — we may earn a small commission at no extra cost to you.

💉

Insulin Syringes

29-31 gauge, 1mL (100 units) or 0.5mL

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🧴

Alcohol Prep Pads

Sterile, individually wrapped, 70% isopropyl

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🧊

Vial Storage Case

Insulated travel case, fridge-ready

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🗑️

Sharps Container

Safe at-home disposal for used insulin syringes

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Peptide Protocol Cost Calculator

?Want to know how much your peptide protocol costs per week or month? This uses the dosing info above plus your vial price to figure it out.

Find out what your peptide protocol actually costs per dose, week, and month.

$
x / week
Per Dose
$2.00
Per Week
$14.00
Per Month
$60.67

Running 2+ peptides? Use the Protocol Builder to see your total weekly cost across all compounds.

Common Peptide Dosing Ranges?This table shows typical dosing ranges for popular peptides. These are general guidelines only. Always follow your provider's instructions.

General guidelines — always follow your provider's instructions. Tap any peptide name for a detailed guide.

PeptideTypical Vial SizeCommon Dose RangeDosing FrequencyBAC Water
Retatrutide5 - 12 mg0.5 - 12 mg1x weekly2 - 3 mL
Semaglutide2 - 5 mg0.25 - 2.4 mg1x weekly1 - 2 mL
Tirzepatide5 - 15 mg2.5 - 15 mg1x weekly2 - 3 mL
BPC-1575 mg250 - 500 mcg1-2x daily2 mL
TB-5005 mg2 - 5 mg2x weekly2 mL
CJC-1295 / Ipamorelin2 - 5 mg100 - 300 mcg1-3x daily2 mL
GHK-Cu5 mg200 - 500 mcg1x daily2 mL
PT-14110 mg1 - 2 mgAs needed2 mL
AOD-96045 mg250 - 500 mcg1x daily2 mL
GHRP-65 mg100 - 300 mcg1-3x daily2 mL
MOTS-c5 - 10 mg5 - 10 mg1-3x weekly2 mL

Peptide Reconstitution: Frequently Asked Questions?Answers to the most common questions beginners have about peptide reconstitution, dosing, and storage.

What do the "units" on my insulin syringe mean?+
The numbers on an insulin syringe measure volume, not medication strength. A standard 1mL syringe goes up to 100 units. So 10 units = 0.1mL, and 50 units = 0.5mL. Think of "units" as just tiny mL markings. Our peptide calculator tells you exactly which unit number to draw to.
Does it matter how much bacteriostatic water I use?+
Not really — the total peptide stays the same regardless of how much water you add. More water just means each mL has less peptide, so you'd draw more liquid per dose. Less water means smaller injections but harder to measure precisely. Most people use 1-3 mL. The peptide reconstitution calculator adjusts automatically.
What's bacteriostatic water and why can't I use regular water?+
Bacteriostatic water (BAC water) is sterile water with 0.9% benzyl alcohol added to prevent bacterial growth. This is important because you'll draw from the same vial multiple times over several weeks. Regular tap or bottled water would allow bacteria to grow. Sterile water (without benzyl alcohol) is only safe for single-use applications. BAC water is available online and at most pharmacies.
How long do reconstituted peptides last in the fridge?+
When stored properly in a refrigerator at 36-46°F (2-8°C), most reconstituted peptides remain potent for 4-6 weeks. Keep the vial upright, avoid leaving it at room temperature, and always swab the stopper with an alcohol pad before each use. If the solution looks cloudy, discolored, or has visible particles, discard it immediately.
What's the difference between mcg and mg?+
They're both measurements of weight. 1 mg (milligram) = 1,000 mcg (micrograms). So 250 mcg is the same as 0.25 mg. Peptide doses are often written in mcg because the amounts are so small. Our calculator displays both units so there's no confusion about your dosage.
Should I use a different syringe to reconstitute vs. inject?+
Ideally yes. The needle tip gets slightly dulled each time it punctures a rubber vial stopper, making injections less comfortable. Best practice is to use one syringe to add the BAC water, then a fresh syringe each time you draw a dose for injection. Insulin syringes are inexpensive enough to use one per injection.
How do I calculate peptide concentration after reconstitution?+
Divide the total peptide amount (in mg) by the amount of water added (in mL). For example: 5 mg peptide + 2 mL BAC water = 2.5 mg/mL concentration. This means every 0.1 mL (10 units on a syringe) contains 0.25 mg (250 mcg). The calculator above does this math for you automatically.

25 Peptides. What They Do. Which Ones Matter.

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About This Calculator

PeptideCalculators.org provides free, no-signup tools for reconstitution math, protocol planning, and peptide research. Use the protocol builder, price comparison tool, half-life chart, and individual peptide guides to move from a vial label to an actual dosing plan. All calculations run in your browser and the site does not store your entries. For educational purposes only.