Peptide Calculator
An open, free online peptide calculator for transparent reconstitution arithmetic. Convert vial mass, diluent volume, and target amounts into U-100 syringe units directly in your browser with no sign-up or download.
Peptide Reconstitution Calculator & Syringe Tool
Select single compound, IU mode, or blend mode to calculate exact syringe units.
Microgram (mcg) ↔ Milligram (mg) Converter
Convert peptide amounts between micrograms (mcg) and milligrams (mg).
How Reconstitution Math Works
Calculating a syringe draw starts by turning dry vial mass into a liquid concentration. If you are learning the steps from scratch, read our walkthrough on how to calculate peptide dosage or follow the peptide reconstitution master guide. When lyophilized powder is dissolved with bacteriostatic water, the total mass in milligrams (mg) spreads evenly through the liquid volume in milliliters (mL).
Concentration & Syringe Units
Whether you enter your target in milligrams or micrograms, the solution's concentration sets how much liquid holds that amount. For common water volumes, see how much bacteriostatic water to add or our 2 mL syringe units conversion guide. On a standard U-100 insulin syringe (100 units = 1.0 mL), a 2.5 mg/mL solution holds 25 mcg per unit mark, so calculating directly in units helps prevent decimal and volume mix-ups.
Single Vials, IU Mode & Blends
The calculator above supports single-peptide vials, International Unit (IU) conversions, and multi-component blends. Enter the vial mass, water volume, and desired amount from your label to see the concentration, draw volume in mL, and the fill line on a U-100 syringe scale.
Vial Scales Across Different Peptides
Different vials use very different mass scales—from microgram conversions on compounds such as BPC-157 and PT-141 to milligram-scale math on GLP-1 and GIP receptor agonists. Every tool on this site performs pure arithmetic from the label you enter and does not recommend doses; several compounds discussed are unapproved by the FDA, and the FDA warns against buying unapproved peptides online.
BPC-157 Arithmetic
For microgram-scale vials such as 5 mg or 10 mg mixed with 2.0 mL of bacteriostatic water, the dedicated BPC-157 calculator converts labeled mass into U-100 syringe marks.
Open BPC-157 Calculator →Tirzepatide Arithmetic
Commercial tirzepatide products come pre-mixed, while multi-dose compounded vials carry a printed mg/mL concentration. Use the Tirzepatide calculator to convert mg/mL or vial mass into U-100 units.
Open Tirzepatide Calculator →Semaglutide Arithmetic
Use the Semaglutide calculator to convert a pharmacy label concentration (such as 2.5 mg/mL or 5.0 mg/mL) or a lyophilized vial ratio into exact U-100 syringe markings.
Open Semaglutide Calculator →Multi-Peptide Blend Calculations
Multi-component vials — including the BPC-157 & TB-500 Blend, the Klow blend label calculator, and CJC-1295 & Ipamorelin — combine multiple active compounds in a single vial.
Adding diluent dissolves every component in the same liquid volume at once, so each peptide keeps its own independent concentration (mg/mL). Use the Multi-Blend tab above to enter the individual milligram amounts printed on your vial label and check what each draw delivers per ingredient.
Milligram Conversions & Incretin Regulatory Context
GLP-1 and GIP receptor agonists are measured in milligrams rather than micrograms, so misreading a mg/mL vial label or confusing units with milligrams can produce large volumetric errors. Our dedicated Semaglutide calculator and Tirzepatide calculator show both printed-concentration and dry-vial arithmetic alongside FDA safety notices. For investigational compounds that lack FDA approval and cannot be compounded under federal law, see our Retatrutide FDA status and limits page.
For example, a 10 mg vial mixed with 2.0 mL of water produces a 5.0 mg/mL solution. Whether you are checking BPC-157 in micrograms or a milligram-scale label, the mcg ↔ mg converter translates between units before you calculate syringe ticks.
How to Reconstitute Peptides with this Calculator
Reconstituting and mixing peptides requires dissolving lyophilized solid powder in a measured volume of diluent (typically bacteriostatic water) to establish an exact solution concentration. For the complete aseptic preparation protocol, review our step-by-step peptide reconstitution master guide. To mix using this calculator, enter the active vial mass in milligrams (mg), diluent volume in milliliters (mL), and desired dose to immediately compute syringe graduation units.
Mass Units Reference Table (Grams, Milligrams & Micrograms)
Peptide vials are labeled in milligrams (mg) or micrograms (mcg), never in grams. If a raw mass is specified in grams, convert to milligrams (mgs) by multiplying by 1,000.
| Unit | Symbol | Milligram (mg) Equivalent | Microgram (mcg) Equivalent |
|---|---|---|---|
| 1 Gram (in grams) | 1 g | 1,000 mg | 1,000,000 mcg |
| 1 Milligram (mgs) | 1 mg | 1 mg | 1,000 mcg |
| 1 Microgram | 1 mcg | 0.001 mg | 1 mcg |
Peptide Dosage Calculator Formulas
Understanding the underlying arithmetic allows you to double-check any calculation manually.
1. Concentration Formula
Example: 5 mg BPC-157 reconstituted with 2.0 mL of bacteriostatic water = 2.5 mg/mL (or 2,500 mcg/mL).
2. Syringe Units Draw Formula (U-100 Syringe)
Example: For a 250 mcg (0.25 mg) dose from a 2.5 mg/mL concentration: (0.25 ÷ 2.5) × 100 = 10 Units (0.10 mL).
3. Total Doses Per Vial
Example: A 10 mg Tirzepatide vial with a 2.5 mg dose yield: 10 ÷ 2.5 = 4.0 Doses.
Peptide Reconstitution Chart & Example Ratios
This chart converts example vial configurations into concentration, U-100 syringe units, and total draws per vial. It serves strictly as an illustrative arithmetic reference and never prescribes doses or clinical regimens. Select any compound to open its interactive calculator.
| Peptide Compound | Example Vial | Bac Water | Example Amount | U-100 Syringe Draw | Draws Per Vial | Calculator |
|---|---|---|---|---|---|---|
| AOD-9604 | 5 mg | 2 mL | 300 mcg | 12.0 Units | 16 Draws | Calculate AOD-9604 → |
| BPC-157 | 5 mg | 2 mL | 250 mcg | 10.0 Units | 20 Draws | Calculate BPC-157 → |
| BPC-157 & TB-500 Blend | 10 mg | 2 mL | Multi-component | 12.0 Units | ~20 Draws | Calculate BPC-157 & TB-500 Blend → |
| CJC-1295 & Ipamorelin | 5 mg | 2 mL | Multi-component | 12.0 Units | ~20 Draws | Calculate CJC-1295 & Ipamorelin → |
| GHK-Cu | 50 mg | 3 mL | 2000 mcg | 12.0 Units | 25 Draws | Calculate GHK-Cu → |
| Klow Blend | 20 mg | 2 mL | Multi-component | 12.0 Units | ~20 Draws | Calculate Klow Blend → |
| KPV | 10 mg | 2 mL | 500 mcg | 10.0 Units | 20 Draws | Calculate KPV → |
| MOTS-c | 10 mg | 2 mL | 2000 mcg | 40.0 Units | 5 Draws | Calculate MOTS-c → |
| PT-141 | 10 mg | 2 mL | 1000 mcg | 20.0 Units | 10 Draws | Calculate PT-141 → |
| Semaglutide | 2 mg | 1 mL | 250 mcg | 12.5 Units | 8 Draws | Calculate Semaglutide → |
| Sermorelin | 5 mg | 2 mL | 300 mcg | 12.0 Units | 16 Draws | Calculate Sermorelin → |
| TB-500 | 5 mg | 2 mL | 2000 mcg | 80.0 Units | 2 Draws | Calculate TB-500 → |
| Tesamorelin | 10 mg | 2 mL | 1000 mcg | 20.0 Units | 10 Draws | Calculate Tesamorelin → |
| Tirzepatide | 10 mg | 2 mL | 2000 mcg | 40.0 Units | 5 Draws | Calculate Tirzepatide → |
Why Use an Open Arithmetic Calculator?
This peptide calculator performs straightforward volumetric math directly in your browser without requiring an account, email address, or app download. To check how any calculation tool handles rounding, syringe scales, and transparency, review our guide on which peptide calculator you should use and run the 5-minute accuracy benchmark.
All computations run locally on your device, so the numbers you enter stay in your browser. For further documentation, browse the Peptide FAQ Knowledge Hub, look up definitions in the Technical Peptide Glossary, inspect primary citations in our Scientific Sources Registry, or read our About Page and Editorial Policy.
Peptide Dosing Calculator FAQ
Expert answers to common peptide reconstitution, syringe unit, and math questions.
How do I calculate how much bacteriostatic water to add in a Peptide Reconstitution Calculator?↓
To calculate reconstitution, divide the total milligrams (mg) of compound in the vial by the volume of bacteriostatic water (mL) added. For example, 5mg of peptide mixed with 2.0 mL of water produces a concentration of 2.5 mg/mL (2,500 mcg/mL). On a standard U-100 syringe (where 100 units = 1.0 mL), each unit equals 25 mcg.
What is a U-100 insulin syringe and how do tick marks convert to mL?↓
A U-100 syringe is calibrated such that 100 units equals 1.0 mL. Therefore, 10 units = 0.10 mL, 50 units = 0.50 mL, and 1 unit = 0.01 mL. When using U-100 syringes for research peptides, units directly represent micro-volumes of reconstituted liquid.
How does a peptide calculator handle multi-peptide blends in a single vial?↓
For multi-peptide vials (for example, a label listing 10 mg Component A, 5 mg Component B, and 5 mg Component C in one vial), the water volume applies to all compounds at once. Dividing each component's labeled mass by the water volume gives its own concentration, so a single syringe draw delivers fixed proportions of every peptide.
How do I convert micrograms (mcg) to milligrams (mg) using a Peptide Dosage Calculator?↓
There are 1,000 micrograms (mcg) in 1 milligram (mg). To convert mcg to mg, divide by 1,000 (e.g., 250 mcg ÷ 1,000 = 0.25 mg). To convert mg to mcg, multiply by 1,000 (e.g., 2.5 mg × 1,000 = 2,500 mcg). You can also use our built-in Mcg ↔ Mg converter widget on this page.
How do IU (International Units) convert to mg or mL?↓
International Units (IU) measure biological activity rather than physical mass, and conversion ratios vary by compound. For Somatropin (HGH), 1 mg is approximately equal to 3.0 IU (so a 10 IU vial equals ~3.33 mg). Our calculator features a dedicated IU Mode toggle for seamless HGH and HCG calculations.
How should reconstituted peptides be stored and when should multi-dose vials be discarded?↓
Once reconstituted with Bacteriostatic Water (containing 0.9% benzyl alcohol), store vials upright in a refrigerator at 2°C–8°C (36°F–46°F) protected from light and never freeze. Under FDA multi-dose sterile vial guidance, discard opened multi-dose vials within 28 days of first puncture unless product labeling specifies a shorter limit.