Compare common vial amounts and liquid volumes. Each cell shows the mathematical concentration in micrograms per milliliter.
Concentration (mcg/mL) = vial amount (mg) x 1,000 / liquid volume (mL)
| Liquid volume | 5 mg vial | 10 mg vial | 15 mg vial |
|---|---|---|---|
| 1 mL | 5,000 mcg/mL | 10,000 mcg/mL | 15,000 mcg/mL |
| 2 mL | 2,500 mcg/mL | 5,000 mcg/mL | 7,500 mcg/mL |
| 3 mL | 1,666.667 mcg/mL | 3,333.333 mcg/mL | 5,000 mcg/mL |
| 5 mL | 1,000 mcg/mL | 2,000 mcg/mL | 3,000 mcg/mL |
Find the vial amount printed on the label, then find the liquid volume in the left column. The matching cell is a concentration reference, not an instruction to add that amount of liquid. Confirm compatible preparation details with product labeling, a pharmacist, or a licensed clinician.
Once you know the actual concentration, use the main Peptide Calculator to calculate the volume and U-100 marking for a confirmed target amount. For a custom vial or liquid volume that is not listed in this table, use the interactive Peptide Reconstitution Calculator.
Peptide reconstitution describes the arithmetic relationship between the amount of material in a vial and the volume of compatible liquid used to make a solution. The result is concentration: how much mass is represented in each milliliter. A dry vial amount is often written in milligrams, while a later target may be written in micrograms. The chart turns the vial amount into micrograms, divides it by the stated liquid volume, and displays the resulting mcg/mL concentration. It is a reference for unit conversion, not a preparation protocol. It cannot identify an appropriate diluent, confirm compatibility, or decide what amount of liquid should be added to a specific product.
Every value in the table follows one formula: concentration in mcg/mL equals vial amount in mg multiplied by 1,000, divided by liquid volume in mL. A 5 mg vial contains 5,000 mcg. When the model distributes that amount into 2 mL, the resulting concentration is 2,500 mcg/mL. When the same amount is distributed into 1 mL, it is 5,000 mcg/mL. The total mass has not changed; only the amount contained in each milliliter has changed. Reading the formula alongside the table helps you recognize why concentrations fall as the liquid volume increases.
Concentration is not a dose. It is a property of the prepared solution: mass per volume. A dose is a target amount from an external, qualified source. The chart deliberately stops after concentration so that these two concepts are not blended together. After concentration is confirmed, a separate calculation can determine which mL volume corresponds to a stated target mass. That second calculation still does not recommend the target amount. Separating the steps makes the math easier to audit and reduces the risk of treating a syringe marking as though it were a mass unit or a clinical recommendation.
Milligrams and micrograms are units of mass: 1 mg equals 1,000 mcg. Milliliters are units of liquid volume. U-100 units are markings on a particular syringe scale where 100 units equal 1 mL. These measures cannot be substituted for one another without a known concentration. For example, 10 U-100 units always represents 0.1 mL on that scale, but the mass within 0.1 mL changes when concentration changes. Keep a unit label next to every value you copy from a source. A misplaced decimal or unmarked mg-to-mcg conversion can produce a result that is mathematically consistent but based on the wrong input.
The listed combinations are common numerical examples only. They do not establish that every vial should receive one, two, three, or five milliliters of liquid. Product instructions, formulation, container capacity, stability information, and professional guidance may differ substantially. The chart also does not account for incomplete vial contents, transfer loss, inaccurate measurement, sterility, storage, or a product's intended use. If the label does not provide a clear amount or the preparation history is uncertain, it is safer to resolve the source information before attempting any downstream conversion.
First confirm the vial amount and make sure it refers to the total material in the vial, not a concentration or a per-serving number. Then confirm the total final liquid volume rather than only the volume of one addition. If the solution has been changed after the original preparation, this fixed chart may no longer describe it. Use the interactive calculator instead, and enter the actual total amount and final volume. A quick manual check is useful too: more liquid with the same amount must produce a lower concentration; less liquid must produce a higher concentration. If the table seems to contradict that relationship, revisit the units before relying on a number.
Use the Peptide Reconstitution Calculator for a custom combination not shown in this chart. Use the main Peptide Calculator when you have a known concentration and need to check the arithmetic for a specified target mass. Use the U-100 Syringe Calculator only to convert volume and U-100 markings, and use the mcg to Units Calculator only after the concentration is confirmed. The tools are designed as a sequence of transparent conversion steps, not as a source of preparation, dosing, or medical decisions. Keeping each task on its matching page makes the assumptions visible at every stage.