How do I use a peptide reconstitution calculator?

Enter your peptide vial amount in mg, the volume of bacteriostatic (BAC) water in mL, and your desired dose in mcg or mg. DrawDose computes the concentration and tells you exactly how many units to draw on your insulin syringe. It supports 0.3mL, 0.5mL, and 1.0mL syringes.

How do I reconstitute a peptide?

Add bacteriostatic (BAC) water slowly down the inside wall of the vial containing lyophilized (powdered) peptide. Swirl gently — never shake. The amount of BAC water determines the concentration. Use DrawDose to calculate the exact volume needed for your desired dose.

How much BAC water should I add to a 5mg or 10mg peptide vial?

It depends on your desired dose. For a 5mg vial with a 0.25mg dose, typically 1-2mL of BAC water gives a convenient 10-20 units per draw. DrawDose calculates the optimal BAC water volume automatically, keeping your syringe draw between 10-50 units for easy measurement.

Does this peptide calculator work for Semaglutide?

Yes. DrawDose works for Semaglutide and all GLP-1 peptides including Tirzepatide, Retatrutide, Liraglutide, Survodutide, and Cagrilintide. It includes dosing protocols with weekly titration schedules for each.

Does this calculator work for Tirzepatide?

Yes. DrawDose supports Tirzepatide reconstitution and dosing. Enter your vial amount and desired dose, and it calculates the exact BAC water volume and syringe units. It also shows the Tirzepatide titration protocol (2.5mg → 5mg → 7.5mg → 10mg → 15mg).

Does this calculator work for BPC-157?

Yes. DrawDose supports BPC-157 and BPC-157 Arginate. It auto-fills the typical starting dose of 250mcg and shows the full dosing protocol including loading and maintenance phases.

What is a Certificate of Analysis (COA) for peptides?

A COA is a lab report showing the actual tested amount of peptide in your vial, which often differs from the labeled amount. Always use the COA amount (not the label amount) when calculating reconstitution for accurate dosing.

What syringe size should I use for peptide injections?

Most peptide injections use U-100 insulin syringes: 0.3mL (30 units), 0.5mL (50 units), or 1mL (100 units). Smaller syringes are more precise for small doses. DrawDose shows a syringe preview with your exact draw level for all three sizes.

How do you convert peptide mg to syringe units?

Divide your vial amount (in mg) by the BAC water volume (in mL) to get concentration (mg/mL). Then divide your desired dose by the concentration to get volume in mL. Multiply by 100 for U-100 syringe units. Example: 10mg vial + 2mL water = 5mg/mL. For a 0.5mg dose: 0.5 ÷ 5 = 0.1mL = 10 units.

What is the difference between mg, mcg, and IU in peptide dosing?

Milligrams (mg) and micrograms (mcg) measure weight: 1mg = 1,000mcg. International Units (IU) measure biological activity and vary by peptide. DrawDose supports both mg and mcg inputs with automatic conversion.

How long do reconstituted peptides last?

Reconstituted peptides stored refrigerated (2-8°C / 36-46°F) with bacteriostatic water typically last 4-6 weeks. Always swirl gently to mix, never shake. Wipe vial tops with alcohol before each draw.

Can I mix multiple peptides in one vial?

Yes. DrawDose includes a Blend Calculator that lets you combine 2-4 peptides into a single vial. It calculates proportional doses, recommended BAC water for each vial, and the combined concentration after blending.

What is bacteriostatic water?

Bacteriostatic (BAC) water is sterile water containing 0.9% benzyl alcohol, which prevents bacterial growth. It keeps reconstituted peptides stable for weeks, unlike plain sterile water which should be used within 24 hours. Always use BAC water for peptide reconstitution.

Is this peptide calculator free?

Yes. DrawDose is completely free on web, iOS, iPadOS, macOS, and Android. No signup, no ads, no tracking. All calculations run on your device — your data never leaves your phone.

DrawDose — Free Peptide Reconstitution Calculator

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How DrawDose Works

DrawDose is a free peptide reconstitution calculator that computes the exact amount of bacteriostatic (BAC) water to add to your lyophilized peptide vial and shows precisely how many units to draw on your insulin syringe. Enter your peptide amount from the COA, select your vial capacity, and set your desired dose — DrawDose does the math instantly.

Supported Peptides

GLP-1 & Weight Loss: Semaglutide, Tirzepatide, Retatrutide, Liraglutide, Survodutide, Mazdutide, Cagrilintide, Tesofensine, AOD-9604, Fragment 176-191
Healing & Recovery: BPC-157, BPC-157 Arginate, TB-500 (Thymosin Beta-4), Pentadecapeptide, KPV, LL-37, Larazotide
Growth Hormone: CJC-1295, CJC-1295 DAC, Ipamorelin, GHRP-2, GHRP-6, Tesamorelin, Sermorelin, Hexarelin, MK-677
IGF & Muscle: IGF-1 LR3, IGF-1 DES, MGF, PEG-MGF, Follistatin 344, Follistatin 315, ACE-031
Cognitive: Selank, Semax, NA-Selank Amidate, NA-Semax Amidate, Dihexa, P21, Cerebrolysin, Cortexin
Anti-Aging: Epitalon, Thymalin, GHK-Cu, FOXO4-DRI, GDF-11, Humanin, SS-31, MOTS-c, NAD+, NMN, Rapamycin
Other: PT-141, Melanotan I, Melanotan II, Oxytocin, DSIP, Gonadorelin, Triptorelin, Kisspeptin-10, VIP, Thymosin Alpha-1, Defensin

Features

Reconstitution Calculator — compute BAC water volume and syringe units from vial amount and desired dose
Two Calculation Modes — calculate by desired dose (auto-adjusts water) or by desired syringe units
Syringe Visualization — visual preview of your draw on 0.3mL, 0.5mL, or 1.0mL insulin syringes
Peptide Blend Calculator — combine 2-4 peptides with proportional dosing and combined concentration
Dosing Protocols — weekly titration schedules, typical doses, frequency, and side effects for 70+ peptides
Vial Labels — generate and copy formatted labels for your reconstituted vials
My Vials — save reconstitution calculations and access them anytime
COA-Based Dosing — uses Certificate of Analysis amounts for precise calculations
100% Private — all calculations on-device, no data collected, no tracking, works offline

Quick Reference

100 units = 1 mL = 1 cc on a U-100 insulin syringe. 1 mg = 1,000 mcg. Bacteriostatic water contains 0.9% benzyl alcohol to prevent bacterial growth. Store reconstituted peptides refrigerated at 2-8°C (36-46°F). Use within 4-6 weeks of reconstitution. Swirl gently to mix — never shake.

DrawDose is not medical advice. All information is for research and educational purposes only. Always consult a qualified healthcare provider. Calculations may contain errors — verify independently before use.