How do I calculate the correct BAC water volume for peptide reconstitution?

The arithmetic uses the final solution volume: concentration (mcg/mL) = peptide amount in mg × 1000 ÷ final solution volume in mL. For a hypothetical 10mg amount and 10mL final volume, the result is 1000 mcg/mL, or 10 mcg per one-unit increment on a U-100 scale. A concentration of 100 mcg per one-unit increment on a U-100 scale would instead be 10000 mcg/mL. Use the exact product or pharmacy instructions for preparation.

What's the difference between insulin units and mcg?

Micrograms measure peptide mass. Insulin units measure biological activity for insulin; a syringe scale is calibrated to a volume convention such as U-100 (100 insulin units/mL) or U-40 (40 insulin units/mL). For a non-insulin solution, a scale can help express volume only when its calibration and the concentration are known. U-100 and U-40 scales are not interchangeable, and insulin units are not universal peptide IU.

How do I calculate the correct dose for my body weight?

Use a bodyweight calculation only when the actual prescription or product direction specifies a mass-per-kilogram amount. As a hypothetical arithmetic example, 80kg × 2 mcg/kg = 160 mcg; that example does not establish that a named peptide should be used at that amount or frequency. Convert the resulting mass to volume only after verifying the actual final concentration and syringe calibration.

What's the best BAC water volume for easy dosing?

The calculator cannot choose a best volume. For a hypothetical 10mg amount in a 10mL final solution, concentration is 1000 mcg/mL and a displayed value of 10 on a U-100 scale represents 100 mcg. That illustrates the relationship between mass, concentration, and volume; the prescribed formulation and device limits control.

How long can reconstituted peptides stay refrigerated?

There is no universal refrigerated shelf life for mixed peptides. Follow the exact formulation label or pharmacy instructions. The EGRIFTA SV label, for example, specifies its supplied sterile water, immediate use, disposal of unused solution, and no freezing or refrigeration of the reconstituted solution. That is a product-specific instruction, not a rule for other peptides.

Can I use regular water instead of bacteriostatic water?

Do not infer an injectable diluent from a generic calculator rule. The bacteriostatic-water label describes water for injection with benzyl alcohol, not saline; another product may specify a different supplied diluent. Household water is not a substitute for pharmaceutical instructions. Check the exact label or ask the dispensing pharmacist before preparing anything.

What happens if I accidentally draw too much or too little peptide?

A percentage error alone cannot show its clinical significance. Stop and check the product identity, actual concentration, intended mass, syringe calibration, and what was drawn. If an incorrect amount has already been administered, contact the prescriber or pharmacist for product-specific advice rather than assuming the difference is harmless or compensating with another amount.

How do I store my reconstituted peptides properly?

Follow the temperature, light-protection, handling, and discard instructions for that exact formulation. Record those instructions on the label without extending the stated time limit. Bacteriostatic water does not establish a new discard date, and a clear-looking solution does not establish potency or sterility.

Peptide Calculator — Free Reconstitution & Dosage Calculator

By the Peptide Dossier Editorial TeamUpdated September 22, 2026How we source

Use the calculator to check concentration, volume, and syringe-scale arithmetic for BPC-157, TB-500, sermorelin, ipamorelin, and other named products. It is a math check, not a prescription or product-preparation instruction.

Last Updated: September 22, 2026 | Reading Time: 12 minutes

Peptide Reconstitution Calculator

Calculate concentration and volume arithmetic from entered product values

Select Peptide

Peptide Amount (mg)

Starting mass is an illustrative example. Replace it with the amount shown on the actual product label.

Final solution volume (mL)

Enter the total volume after mixing, not the vial capacity. The starting mass and 2 mL volume are illustrative examples, not a prescribed regimen. The calculator does not select a diluent; use product-specific preparation instructions.

Syringe Type

Insulin (U-100 scale: 100 units/mL)Standard (mL)

Desired Dose per Injection

Optional arithmetic input; no amount is preselected. Results are calculated quantities, not dose recommendations.

Injection Frequency (for theoretical arithmetic duration)

Used only for theoretical arithmetic duration; it is not a treatment schedule or shelf-life calculation.

Enter peptide amount, final solution volume, and desired dose to see calculations

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

Use the calculator to make the arithmetic explicit. Enter the values from the actual product or pharmacy instructions, then compare the displayed concentration and volume with the syringe calibration you have been told to use.

Step 1: Enter Your Peptide Amount

Enter the labeled mass of the freeze-dried material in milligrams (mg).

Step 2: Enter Volume and Mass to Convert

Enter the final solution volume in mL and the mass to convert. The calculator computes concentration from those inputs; use the actual formulation instructions for the diluent and preparation volume. For a U-100 scale, 1000 mcg/mL equals 10 mcg per one-unit increment on a U-100 scale, while 100 mcg per one-unit increment on a U-100 scale equals 10000 mcg/mL.

Step 3: Get Instant Results

The calculator displays the concentration and volume corresponding to your entries. Check the displayed units, final volume, and syringe calibration.

Step 4: Reference Your Dosing Conversions

Change the entered mass to compare conversions. A displayed U-100 or U-40 scale value describes a device calibration, not a fixed peptide mass. Verify the actual product concentration and syringe scale independently.

Peptide Reconstitution Basics

Reconstitution means dissolving a powder in its specified diluent. Product instructions determine which diluent and preparation volume to use. The calculation uses the final solution volume—the volume of the resulting solution—not an assumed amount of water added.

The Core Formula

The calculator uses this relationship:

Concentration (mcg/mL) = (Peptide Amount in mg × 1000) ÷ Final Solution Volume in mL

For a hypothetical 5mg amount in a 5mL final solution, the concentration is 1000 mcg/mL. At that explicit example concentration, 250 mcg corresponds to 0.25mL or 25 on a U-100 scale, and 500 mcg corresponds to 0.5mL or 50 on a U-100 scale. The example illustrates arithmetic only; it does not tell you what to mix or administer.

Why Concentration Matters

Higher concentrations produce smaller volumes for the same mass, while lower concentrations produce larger volumes. Neither is automatically preferable. Use the final volume and concentration supplied for the exact formulation rather than borrowing a number from another product.

Common Peptide Dosing Examples

The examples below are bounded arithmetic exercises, not typical regimens. They do not establish a product dose, frequency, diluent choice, stability period, or route.

BPC-157 Dosage Calculator Reference

For a hypothetical 5mg amount and 5mL final solution, the concentration is 1000 mcg/mL. The arithmetic conversions are 250 mcg = 0.25mL = 25 on a U-100 scale and 500 mcg = 0.5mL = 50 on a U-100 scale.

Hypothetical 5mg / 5mL math:

• Amount: 5mg = 5000 mcg
• Final solution volume: 5mL
• Concentration: 1000 mcg/mL (10 mcg per one-unit increment on a U-100 scale)
• 250 mcg: 0.25mL or 25 on a U-100 scale
• 500 mcg: 0.5mL or 50 on a U-100 scale
• Whole-portion arithmetic: 20 portions of 250 mcg or 10 portions of 500 mcg; this is not a lifetime or shelf-life estimate

See the BPC-157 dosage guide for evidence and route distinctions. Neither page replaces product-specific instructions or a clinician’s assessment.

TB-500 Dosage Calculation

“TB-500” should not automatically be treated as full-length thymosin beta-4. In one primary analysis, Esposito and colleagues identified Ac-LKKTETQ, an acetylated seven-residue fragment, in one confiscated vial; that result does not identify every product. For a separate hypothetical arithmetic exercise, 10mg in a 10mL final solution equals 1000 mcg/mL.

Read the primary identity analysis

Hypothetical 10mg / 10mL math:

• Amount: 10mg = 10000 mcg
• Final solution volume: 10mL
• Concentration: 1000 mcg/mL (10 mcg per one-unit increment on a U-100 scale)
• 2000 mcg: 2mL or 200 on a U-100 scale
• The 2mL result exceeds a 1mL device; it is not an instruction to split or administer a portion
• Whole-portion arithmetic: five 2000 mcg portions; this does not establish safe administration or shelf life

Sermorelin Dosing

As a hypothetical 5mg / 5mL final-solution example, 200 mcg corresponds to 0.2mL or 20 on a U-100 scale, while 300 mcg corresponds to 0.3mL or 30 on a U-100 scale. Five thousand micrograms contains 25 whole 200 mcg portions or 16 whole 300 mcg portions with 200 mcg remaining; dead space and product instructions are not included in that count.

GHK-Cu & Other Peptides

Other named peptides may differ in identity, formulation, route, concentration, and measuring instructions. Enter only the mass and final volume supported by the actual product or prescription. Similar-looking arithmetic does not establish a shared dose range or preparation method.

Insulin Syringe Units vs Micrograms

Micrograms measure peptide mass. Insulin units describe biological activity for insulin, while markings on an insulin syringe reflect its calibration. A peptide calculator can relate volume and mass only after the concentration and device scale are explicit.

What Are Insulin Units?

U-100 means 100 insulin units per mL and U-40 means 40 insulin units per mL. For a volume calculation, 0.2mL corresponds to 20 on a U-100 scale or 8 on a U-40 scale. Those scales are not interchangeable, and neither calibration makes a peptide an insulin product. Device capacity also matters: common syringe capacities and graduation sizes vary by model.

See a device-specific FDA 510(k) summary

The Vetsulin label illustrates a U-40 product-specific scale: it is 40 insulin units/mL and is not interchangeable with U-100 calibration. That animal-product label is a dimensional example, not a peptide-use recommendation.

A displayed scale value is not a count of physical tick marks: tick spacing and the smallest graduation may differ by device, so check the actual scale before treating a number as a drawable increment.

What Are Micrograms?

Micrograms (mcg) measure mass. One milligram equals 1000 micrograms. A statement such as “250 mcg” identifies a mass, not a volume, insulin activity unit, or universal peptide IU.

How They Connect: Concentration

The bridge is concentration. At an explicit hypothetical concentration of 100 mcg per one-unit increment on a U-100 scale, 10 on that scale correspond to 1000 mcg. That concentration equals 10000 mcg/mL; it is not the same as 1000 mcg/mL, where each one-unit increment on a U-100 scale equals 10 mcg.

Dose in mcg = Volume (mL) × Concentration (mcg/mL)

Example Conversions

At the explicit 100 mcg per one-unit increment on a U-100 scale example concentration:

1 on a U-100 scale = 100 mcg
2 on a U-100 scale = 200 mcg
5 on a U-100 scale = 500 mcg
10 on a U-100 scale = 1000 mcg
25 on a U-100 scale = 2500 mcg

These values are only a concentration-specific conversion. The FDA’s compounded-semaglutide dosing-error alert describes how mg, mL, concentration, and syringe markings can be confused; it does not establish that all peptides are unsafe or supply a peptide regimen.

Read the FDA dosing-error alert

Tips for Accurate Peptide Dosing

Use these checks to audit the arithmetic and product instructions.

Use the Product-Specified Diluent

Bacteriostatic water and saline are different products. The bacteriostatic water label describes water for injection with benzyl alcohol, not sodium chloride. It is not a universal substitute: EGRIFTA SV specifies its supplied sterile water and product-specific handling. Follow the exact formulation instructions.

Verify the Actual Concentration

No single concentration is appropriate for every product. Write down the amount, final solution volume, concentration, and syringe calibration together. At 100 mcg per one-unit increment on a U-100 scale, 10 on that scale represent 1000 mcg; at 10 mcg per one-unit increment on a U-100 scale, 10 on that scale represent 100 mcg.

Label Everything

Record the product identity, preparation date, actual concentration, and supplied discard and storage instructions. The label generator preserves your entries; it does not validate an expiry date.

Keep a Dosing Log

If a clinician has instructed you to use a product, a log can help reconcile the date, time, site, and scale values entered.

Storage After Reconstitution

Storage limits depend on the exact product, diluent, and formulation. Do not infer weeks of usable life from the presence of bacteriostatic water. Follow supplied temperature and discard instructions; see the linked product labels above and our peptide storage guide for further context.

Injection Technique Matters

Follow the prescriber or pharmacist’s instructions and use our peptide injection guide only as additional context; arithmetic does not teach technique.

Related Resources

Frequently Asked Questions

Master Your Peptide Dosing Today

Use the calculator to check concentration and volume arithmetic, then review the exact formulation, syringe calibration, and product instructions with the responsible clinician or pharmacist.

Scroll back to the interactive calculator above to check a hypothetical conversion, or explore the related guides for product-specific evidence and storage context.