Peptide Reconstitution & Dosage Calculator
Use one peptide calculator to relate vial size, BAC water volume, concentration, and U-100 syringe markings. Enter your own quantities in the existing mode switcher for standard conversion, reconstitution arithmetic, blends, reverse calculation, or amount splitting. The examples below explain the mathematics only: they do not select a dose, recommend adding a particular water volume, or establish whether a preparation is suitable for use.
Interactive calculator
The calculator and its inputs load in your browser. The reference below is available without JavaScript.
How to use the peptide calculator
- Choose Dose to Units for standard calculation, or select another mode in the switcher. Selecting a compound is optional; verify every prefilled value against the vial label.
- Enter the amount in the vial, in mg. For an IU-labeled product, select the existing IU option and keep the entered amount and desired amount in IU.
- Enter the BAC water volume in mL. The concentration is calculated from the numerical volume you supply.
- Enter the desired amount and select its unit. In mass mode, 1 mg = 1,000 mcg; do not confuse mass with syringe markings.
- Read the calculated volume and U-100 syringe units. In blend mode enter every component's vial amount; in reverse mode enter syringe units instead of a desired amount.
The reconstitution formula
Concentration (mg/mL) = mg in vial ÷ mL of water.
Volume (mL) = desired amount (mg) ÷ concentration (mg/mL).
U-100 syringe units = volume (mL) × 100. Convert mcg to mg by dividing by 1,000 before calculating.
Worked examples
5 mg vial with 2 mL water
5 ÷ 2 = 2.5 mg/mL. For an arbitrary example amount of 0.25 mg (250 mcg), volume = 0.25 ÷ 2.5 = 0.1 mL. On a U-100 syringe, 0.1 × 100 = 10 units.
10 mg vial with 2 mL water
10 ÷ 2 = 5 mg/mL. A hypothetical 0.5 mg amount corresponds to 0.5 ÷ 5 = 0.1 mL, or 10 U-100 units. The same syringe volume contains twice the mass in the preceding concentration.
5 mg vial with 1 mL water
5 ÷ 1 = 5 mg/mL. A hypothetical 0.2 mg amount corresponds to 0.2 ÷ 5 = 0.04 mL. Multiply by 100 to obtain 4 U-100 units; this is a volume conversion, not a recommended amount.
Concentration reference table
Pure-math reference: 10 U-100 syringe units = 0.1 mL. Amounts are not dosing recommendations.
| Vial (mg) | Water (mL) | Concentration (mg/mL) | Amount per 10 U-100 units (mcg) |
|---|---|---|---|
| 5 | 1 | 5 | 500 |
| 5 | 2 | 2.5 | 250 |
| 5 | 3 | 1.667 | 166.667 |
| 10 | 1 | 10 | 1000 |
| 10 | 2 | 5 | 500 |
| 10 | 3 | 3.333 | 333.333 |
Peptide blend calculator
Enter each component's labeled mass and the shared water volume to calculate both total and individual concentrations. Each component's amount in a draw is its concentration multiplied by the same draw volume.
The ratio is fixed by the vial's contents: changing volume changes all components together, not independently. This arithmetic does not establish compatibility or recommend mixing substances.
For a hypothetical vial labeled 5 mg BPC-157 + 5 mg TB-500 in 2 mL, each component is 2.5 mg/mL and the total is 5 mg/mL. A 0.1 mL draw (10 U-100 units) contains 0.25 mg of each component, or 0.5 mg total.
Use the blend calculatorReverse peptide calculator
Reverse calculation starts with a known syringe-unit reading rather than a desired amount. Divide U-100 units by 100 to find mL, then multiply that volume by the vial's concentration.
The result is the amount represented by the entered volume, not an instruction to use that amount.
For 5 mg in 2 mL, concentration is 2.5 mg/mL. An entered reading of 20 U-100 units is 20 ÷ 100 = 0.2 mL; 0.2 × 2.5 = 0.5 mg (500 mcg).
Use the reverse calculatorFrequently asked questions
How many units is 0.1 mL?
On a U-100 syringe, 0.1 mL × 100 = 10 units. These markings describe volume, not milligrams or a substance's biological activity.
How much bacteriostatic water should I add?
This calculator compares the concentration produced by the water volume you enter; it does not prescribe a volume. Use the product's preparation instructions and vial capacity. Doubling the entered water volume halves the calculated concentration.
How do I convert micrograms to milligrams?
1,000 mcg equals 1 mg. Divide a microgram amount by 1,000: for example, 250 mcg is 0.25 mg. Use matching mass units when dividing by concentration.
Does it work with U-40 or U-50 syringes?
The displayed syringe-unit results use U-100 calibration only. For the same volume, U-40 markings equal mL × 40 and U-50 markings equal mL × 50. A 0.5 mL, 50-unit U-100 syringe is not a U-50 syringe.
How do I calculate a peptide blend?
Divide each component's mass by the shared water volume. Multiply each concentration by the draw volume to calculate its share. For equal 5 mg components in 2 mL, 0.1 mL contains 0.25 mg of each. The tool does not assess compatibility.
What is a reverse peptide calculator?
It converts an entered syringe volume back into an amount. On U-100, divide units by 100 to obtain mL, then multiply by concentration. For example, 20 units at 2.5 mg/mL represents 0.5 mg.
Are the examples dosing recommendations?
No. Every example and table entry is hypothetical arithmetic. The calculator converts quantities you supply; it does not determine an appropriate amount, frequency, route, or treatment.
Why do rounded results differ slightly?
Some concentrations repeat indefinitely, such as 5 ÷ 3 mg/mL. Retain full precision during division and round only the final displayed result. The table rounds repeating values for readability.