Peptide Calculator — Free Reconstitution & Dosage Calculator
Use our free peptide calculator to instantly compute reconstitution math, BAC water volumes, & dosing conversions for BPC-157, TB-500, sermorelin, ipamorelin, & more. No more manual calculation errors.
Last Updated: March 2026 | Reading Time: 12 minutes
Peptide Reconstitution Calculator
Calculate concentrations and dosing volumes for peptide reconstitution
Calculation Results
Concentration
25.00
mcg per unit
Volume to Draw
10.0
units per dose
Doses per Vial
20.0
total doses
Vial Duration
20
days
Syringe Fill Indicator
Vial Label Generator
BPC-157
25.00 mcg/unit
Reconstituted: 2026-04-06
Expires: 2026-05-04
Disclaimer: This calculator is for research and educational purposes only. It is not medical advice. Always consult with a healthcare professional before using any peptide product. Verify all calculations independently.
How to Use the Peptide Calculator
Our interactive peptide calculator removes the guesswork from reconstitution math. Follow these simple steps to instantly calculate your BAC water volume, final concentration, & dosing conversions.
Step 1: Enter Your Peptide Amount
Input the weight of your freeze-dried peptide powder in milligrams (mg). Most common vials come in 2mg, 5mg, 10mg, or 15mg sizes. You\'ll find this information on your vial label.
Step 2: Choose Your Desired Concentration
Select how concentrated you want your final solution. The most popular choice is 100 mcg/unit (which equals 1000 mcg/mL on a standard insulin syringe), but you can also choose 50 mcg/unit or 200 mcg/unit depending on your typical injection volumes. Higher concentrations mean smaller injection volumes; lower concentrations mean larger volumes.
Step 3: Get Instant Results
The calculator instantly displays your required BAC water volume in milliliters, your final concentration in mcg/mL, & conversion charts for common doses. Use these numbers when reconstituting your peptide vial.
Step 4: Reference Your Dosing Conversions
The calculator also shows you how many insulin syringe units correspond to common peptide doses (100 mcg, 250 mcg, 500 mcg, 1000 mcg, etc.). This reference chart prevents dosing mistakes during actual injections.
Peptide Reconstitution Basics
Reconstitution is the process of mixing your freeze-dried peptide powder with bacteriostatic water to create an injectable solution. The amount of water you add determines your final concentration—the amount of peptide dissolved per unit of volume.
The Core Formula
The fundamental peptide calculator equation is simple:
Concentration (mcg/mL) = (Peptide Amount in mg × 1000) ÷ Water Volume in mL
This formula converts milligrams to micrograms (×1000), then divides by your water volume to get the final strength. If you know any two variables, you can calculate the third.
Why Concentration Matters
Choosing the right concentration is crucial for accurate peptide dosing. Too concentrated, & small measurement errors become huge dose errors. Too dilute, & you\'ll need large injection volumes. Most experienced users standardize on 100 mcg/unit for simplicity.
Common Peptide Dosing Examples
Different peptides have different standard dosing ranges. Here\'s a quick reference for the most popular peptides using a 100 mcg/unit concentration standard.
BPC-157 Dosage Calculator Reference
BPC-157 (Body Protection Compound-157) is typically dosed at 250-500 mcg per injection, once daily. A common vial size is 5mg.
5mg BPC-157 Reconstitution:
- • Vial: 5mg freeze-dried powder
- • Add: 5mL bacteriostatic water
- • Final concentration: 1000 mcg/mL (100 mcg/unit)
- • Standard dose: 2-5 units (250-500 mcg) once daily
- • Vial duration: Approximately 5-10 days at typical dosing
Visit our BPC-157 dosage guide for detailed protocols & research-backed recommendations.
TB-500 Dosage Calculation
TB-500 (Thymosin Beta-4) is typically dosed at 2mg (2000 mcg) twice weekly. Standard vials are 5mg or 10mg.
10mg TB-500 Reconstitution:
- • Vial: 10mg freeze-dried powder
- • Add: 10mL bacteriostatic water
- • Final concentration: 1000 mcg/mL (100 mcg/unit)
- • Standard dose: 20 units (2000 mcg) twice weekly
- • Vial duration: Approximately 2.5 weeks at 2× weekly dosing
Sermorelin Dosing
Sermorelin (GHRH) is typically dosed at 200-300 mcg once daily before bed. Standard vials are 2mg or 5mg.
5mg Sermorelin Reconstitution:
- • Vial: 5mg freeze-dried powder
- • Add: 5mL bacteriostatic water
- • Final concentration: 1000 mcg/mL (100 mcg/unit)
- • Standard dose: 2-3 units (200-300 mcg) before bed
- • Vial duration: Approximately 3-4 weeks at daily dosing
GHK-Cu & Other Peptides
GHK-Cu is typically dosed at 200-600 mcg daily. Most other research peptides follow similar dosing patterns in the 100-500 mcg range. Use the peptide dosage calculator above with your specific vial size & preferred concentration to compute exact volumes.
Insulin Syringe Units vs Micrograms
One of the most confusing aspects of peptide dosing is the relationship between insulin units (a volume measurement) & micrograms (a weight measurement). Understanding this conversion is essential for accurate peptide mixing & dosing.
What Are Insulin Units?
Insulin units measure volume on an insulin syringe. A standard insulin syringe holds 1mL & is marked with 100 unit increments. Therefore: 100 units = 1mL, 10 units = 0.1mL, & 1 unit = 0.01mL. These are purely volume measurements, not dose measurements.
What Are Micrograms?
Micrograms (mcg) measure the actual weight/dose of peptide you\'re injecting. One milligram = 1000 micrograms. When peptide protocols specify "250 mcg," they mean 250 micrograms by weight, regardless of volume.
How They Connect: Concentration
The bridge between these two measurements is concentration. If your peptide is reconstituted to 100 mcg/unit (meaning 100 micrograms per 1 unit on your syringe), then drawing 10 units delivers exactly 1000 mcg. This is why establishing a consistent peptide dosage calculator standard is so important.
Dose in mcg = Units drawn × Concentration (mcg/unit)
Example Conversions
At 100 mcg/unit concentration:
- 1 unit = 100 mcg
- 2 units = 200 mcg
- 5 units = 500 mcg
- 10 units = 1000 mcg
- 25 units = 2500 mcg
Tips for Accurate Peptide Dosing
Beyond calculator math, these practical tips ensure you actually deliver the doses you\'ve calculated.
Always Use Bacteriostatic Water
Never use regular sterile water or saline for peptide reconstitution. Bacteriostatic water (BAC water) contains benzyl alcohol as a preservative that prevents bacterial contamination. Without it, your reconstituted peptide becomes a breeding ground for bacteria, risking serious infection if injected.
Standardize on 100 mcg/Unit
The 100 mcg/unit concentration is the peptide dosage calculator gold standard because the math is simple: 10 units always equals 1000 mcg. This makes it nearly impossible to miscalculate. Other concentrations exist, but stick with this standard if you\'re just starting out.
Label Everything
Write the peptide name, reconstitution date, concentration (100 mcg/unit), & expiration date on each vial label. This prevents accidental use of expired or mislabeled peptides.
Keep a Dosing Log
Track every injection in a log with date, time, injection site, & syringe units drawn. This helps you spot patterns, track effects accurately, & catch dosing mistakes.
Storage After Reconstitution
Store reconstituted peptides in a refrigerator at 2-8°C (35-46°F) upright in a dark container. Properly stored peptides typically remain stable for 3-4 weeks, though many last up to 8 weeks. Never freeze. For detailed storage guidance, see our peptide storage guide.
Injection Technique Matters
Even perfect peptide dosage calculations mean nothing if injection technique is poor. For step-by-step instructions, visit our peptide injection guide.
Related Resources
Frequently Asked Questions
To calculate BAC water volume, you need to know three variables: the peptide amount (usually in mg), your desired final concentration (typically measured in mcg/unit), and the desired syringe volume. The basic formula is: Water Volume (mL) = (Peptide Amount in mg × 1000) ÷ Desired Concentration (mcg/mL). For example, if you have 10mg of peptide and want a 100 mcg/unit concentration using insulin syringes (100 units = 1mL), you'd need 10mL of BAC water. Always use bacteriostatic water, never standard saline, as it prevents bacterial contamination during storage.
Insulin units and micrograms (mcg) measure different things. Insulin units are a measure of volume on insulin syringes (100 units = 1mL), while mcg (micrograms) measure actual peptide dosage by weight. The conversion between them depends on your final concentration. If you reconstitute to 100 mcg/unit, then drawing 10 units on an insulin syringe gives you 1000 mcg. This is why concentration matters: the same syringe volume yields different mcg amounts depending on how you reconstituted your peptide.
Most peptides are dosed by body weight in micrograms per kilogram (mcg/kg) or micrograms per pound (mcg/lb). First, convert your weight to kilograms (pounds ÷ 2.2). Then multiply by the recommended dose. For example, a 200-pound (90.9kg) person using a 2 mcg/kg dose of sermorelin would need: 90.9kg × 2 mcg/kg = 181.8 mcg per injection. Knowing your final concentration helps convert this to syringe volume. Always start with lower doses and increase gradually to assess tolerance.
A concentration of 100 mcg/unit (or 100 mcg/IU on insulin syringes) is considered the gold standard for ease of use. This means 10 units on an insulin syringe equals exactly 1000 mcg, and 1 unit equals 100 mcg. To achieve this with common peptide amounts: 10mg peptide + 10mL BAC water = 100 mcg/unit concentration. This makes mental math simple and reduces dosing errors. Some prefer 50 mcg/unit or 200 mcg/unit based on their typical dose sizes, but 100 mcg/unit is most popular for its ease.
Properly reconstituted peptides in bacteriostatic water can typically last 3-4 weeks in the refrigerator (2-8°C), though many remain stable for up to 8 weeks depending on storage conditions and the specific peptide. The bacteriostatic agent in BAC water prevents bacterial growth. Once reconstituted, store vials upright in the refrigerator away from light. Never freeze reconstituted peptides as this can damage the peptide structure. Always inspect for discoloration or cloudiness before use, which indicates contamination.
No, you should never use regular water or saline to reconstitute peptides. Regular water lacks the bacteriostatic (bacteria-preventing) properties of BAC water, which contains benzyl alcohol as a preservative. Without this protection, your reconstituted peptide becomes susceptible to bacterial and fungal contamination, especially in the warm environment of a refrigerator. This contamination can cause infections if you inject the compromised peptide. Always use pharmaceutical-grade bacteriostatic water (0.9% sodium chloride with 1.1% benzyl alcohol).
Drawing slightly more or less than your target dose (within ±10-20%) typically won't cause serious issues, but frequent miscalculations can lead to inconsistent results and difficulty tracking your response to the peptide. Using a marking system on syringes or keeping detailed injection logs helps prevent this. If you consistently draw too much, you risk exceeding safe dosing limits and experiencing more side effects. If you consistently draw too little, you may not see desired benefits. Using a standardized concentration (like 100 mcg/unit) and marking syringes with tape makes accurate dosing much easier.
Store reconstituted peptides in the refrigerator at 2-8°C (35-46°F), never at room temperature. Keep vials upright in a dark container or box to protect from light exposure, which can degrade peptides. Use a dedicated refrigerator shelf if possible, away from food items. Never freeze reconstituted peptides. Before each use, inspect the vial for cloudiness, discoloration, or particles—signs of contamination. Always use sterile needles and swab the rubber septum with an alcohol wipe before each injection to prevent introducing bacteria. Properly stored peptides maintain potency for 3-4 weeks minimum.
Master Your Peptide Dosing Today
Our free peptide dosage calculator & comprehensive guides take the confusion out of reconstitution math. Whether you\'re calculating BPC-157 dosing, TB-500 volumes, or sermorelin mixing ratios, you now have the tools to do it accurately.
Scroll back to the interactive calculator above to instantly compute your next reconstitution, or explore our related guides for peptide-specific protocols.
Related Guides & Resources
How to Reconstitute Peptides
Step-by-step sterile technique, vial preparation, & reconstitution process for safety.
BPC-157 Dosage Guide
Specific dosing protocols, vial sizes, & reconstitution examples for BPC-157.
Peptide Storage Guide
Optimal temperature, light protection, & shelf-life for reconstituted peptides.
How to Inject Peptides
Injection sites, depth, angle, & sterile technique for safe subcutaneous administration.