Free Peptide Reconstitution Calculator

What is a peptide reconstitution calculator?

A peptide calculator is an online tool for calculating reconstitution volume, resulting peptide concentration, syringe draw, and total doses per vial based on the input values and user-defined parameters entered for each vial.

Supported Compounds

The Blackwell BioLabs peptide reconstitution calculator supports 17 research compounds, including BPC-157, TB-500, GHK-Cu, and Retatrutide.

Preset Options

Each compound includes compound-specific presets for faster setup and accurate results.

What is peptide reconstitution?

Peptide reconstitution is the process of dissolving a lyophilized (freeze-dried) peptide powder in a liquid solvent, typically bacteriostatic water, to create a solution suitable for laboratory research use. Lyophilized peptides are stable in powder form but must be reconstituted before use in research protocols.

How do I use this peptide calculator?

Enter your vial quantity or total amount in milligrams (mg), your desired concentration in micrograms per milliliter (mcg/mL), and your desired dose or target amount in micrograms (mcg). The tool uses these inputs to calculate peptide dosage and return the specific amount to draw, along with exactly how much bacteriostatic water to add to achieve your target concentration and how many doses your vial will yield. Peptide calculators help determine correct dosage in micrograms. Reconstitution calculations convert milligrams to micrograms.

What is bacteriostatic water and why is it used for peptide reconstitution?

Bacteriostatic water (BAC water) is sterile water containing 0.9% benzyl alcohol as a preservative. It is the standard solvent for reconstituting research peptides because the benzyl alcohol inhibits bacterial growth, allowing the reconstituted solution to remain stable for up to 28 days when stored at 2 to 8 degrees Celsius. This makes it ideal for multi-use research vials and peptide reconstitution.

Can I use sterile water instead of bacteriostatic water for peptide reconstitution?

Sterile water can technically dissolve a lyophilized peptide, but it lacks a preservative agent. Without bacteriostatic preservation, a reconstituted peptide solution must be used within 24 hours to prevent microbial contamination. For laboratory research requiring multi-use vials over days or weeks, bacteriostatic water is strongly preferred to maintain solution integrity and reduce contamination risk.

How accurate is this peptide calculator?

The Blackwell BioLabs peptide calculator uses the standard reconstitution formula: Concentration (mcg/mL) = Peptide Amount (mg) × 1000 ÷ BAC Water Volume (mL). Syringe draw volume = Dose (mcg) ÷ Concentration (mcg/mL). This is the same formula used in laboratory research protocols worldwide. The calculator rounds syringe marks to the nearest whole unit for practical measurement, while also displaying the precise value for verification.

Which research peptides does this calculator support?

This peptide calculator includes presets for 17 research compounds: BPC-157, GHK-Cu, TB-500, Selank, Semax, Retatrutide, Cerebrolysin, KPV, MOTS-c, SS-31, Dihexa, NAD+, Epithalon, DSIP, CJC-1295 w/DAC, Tesamorelin, and Ipamorelin. Researchers frequently use BPC-157, TB-500, and GHK-Cu in recovery-focused studies. Each preset includes the standard vial size, recommended bacteriostatic water volume, and common research doses. A custom option is also available for any unlisted lyophilized compound.

What is the peptide reconstitution formula?

The reconstitution formula has two steps. First, calculate concentration: divide the total peptide amount, or total micrograms, by the volume of bacteriostatic water added (in mL) to get peptide concentration in mcg/mL. For example, a 10 mg (10,000 mcg) vial in 2 mL of BAC water = 5,000 mcg/mL. Second, calculate your draw volume: divide your peptide dose (in mcg) by the concentration (mcg/mL). A 500 mcg dose at 5,000 mcg/mL = 0.10 mL = 10 units on a 100-unit insulin syringe, based on the syringe volume.

How do I calculate syringe marks for peptide research?

To calculate syringe marks on a standard 100-unit (1 mL) insulin syringe: first determine your concentration (mcg/mL) by dividing total peptide mcg by BAC water volume in mL. Then divide your target dose (mcg) by that concentration to get draw volume in mL. Multiply mL by 100 to get syringe units. Example: 5 mg BPC-157 reconstituted in 2 mL BAC water = 2,500 mcg/mL. For a 250 mcg dose: 250 ÷ 2,500 = 0.10 mL = 10 units on the syringe. The calculator above handles this automatically for all 17 supported compounds.

Is there a free peptide reconstitution calculator online?

Yes. This free calculator requires no account or signup and covers 17 research compounds with preset values for vial size, BAC water volume, and common doses. It outputs concentration in mcg/mL, draw volume in mL, syringe mark on a standard 100-unit insulin syringe, and total dose count per vial. Results recalculate instantly as you adjust inputs.

How do I reconstitute BPC-157 for laboratory research?

For a standard 10 mg BPC-157 vial: add 2 mL of bacteriostatic water to get a concentration of 5,000 mcg/mL. For a 250 mcg research dose, draw to the 5-unit mark on a 100-unit insulin syringe (0.05 mL). For a 500 mcg dose, draw to the 10-unit mark. The vial yields 40 doses at 250 mcg or 20 doses at 500 mcg. Store reconstituted BPC-157 at 2–8°C and use within 28 days. For other BAC water volumes or custom doses, use the peptide calculator above.

How do I reconstitute TB-500 for research?

For a standard 20 mg TB-500 vial: add 3 mL of bacteriostatic water to get a concentration of 6,667 mcg/mL. For a 2.5 mg (2,500 mcg) research dose, draw to approximately 37.5 units on a 100-unit insulin syringe. For a 5 mg (5,000 mcg) dose, draw to 75 units. TB-500 is commonly dosed in milligrams due to the larger vial size. The peptide calculator above handles TB-500 conversions automatically with preset dose options.

What concentration should I use when reconstituting research peptides?

The optimal reconstitution concentration depends on your target dose and syringe precision. A general guideline: reconstitute so that each dose requires 5–50 units on a 100-unit insulin syringe. Draws below 3–4 units are too small to measure accurately. Draws above 50–60 units reduce the number of doses per syringe fill. For common compounds: BPC-157 (10 mg vial) is typically reconstituted at 2–3 mL BAC water (3,333–5,000 mcg/mL). Ipamorelin (10 mg vial) at 2–3 mL (3,333–5,000 mcg/mL). The calculator above shows which BAC water volume gives the most practical syringe marks for your dose.

How do I calculate total doses from a peptide vial?

Total doses = (Vial size in mcg) ÷ (Dose per use in mcg). Convert vial size from mg to mcg by multiplying by 1,000. Example: a 10 mg BPC-157 vial contains 10,000 mcg. At 500 mcg per dose: 10,000 ÷ 500 = 20 doses. At 250 mcg per dose: 10,000 ÷ 250 = 40 doses. The peptide reconstitution calculator above calculates total doses automatically alongside syringe marks and concentration.