How to use this peptide calculator
This peptide calculator is designed to make concentration and liquid-volume calculations easier to understand. You provide all three figures: the amount in the vial, the volume of bacteriostatic water and the target amount you want to model.
It may also be described as a BAC water calculator, peptide mixing calculator or peptide reconstitution calculator. These names refer to the same basic concentration calculation.
- Enter the vial strength. If the vial label states 10 mg, enter 10.
- Enter the water volume. Add the total number of millilitres used in your calculation.
- Enter the target amount. Choose micrograms (mcg) or milligrams (mg).
- Select the syringe capacity. Choose 30, 50 or 100 U-100 units.
- Select calculate. The result shows the volume in millilitres and its equivalent position on a U-100 syringe scale.
The calculator warns you when a result is larger than the selected syringe capacity or larger than the total amount entered for the vial. Always check the label, units and measuring equipment independently.
How the peptide calculator formula works
The calculator first converts the vial strength from milligrams to micrograms. It then divides that quantity by the liquid volume to find the concentration. Finally, it divides the target amount by the concentration to find the required liquid volume.
Vial amount in mcg = vial strength in mg × 1,000
Concentration in mcg/mL = vial amount in mcg ÷ water in mL
Liquid volume in mL = target amount in mcg ÷ concentration
U-100 syringe units = liquid volume in mL × 100
Worked concentration example
If 10 mg is modelled with 2 mL of liquid, the concentration is 5,000 mcg per mL. A target amount of 250 mcg is therefore 0.05 mL, which corresponds to 5 units on a U-100 scale. This example demonstrates the arithmetic only; it is not a suggested dose.
Understanding U-100 syringe units
On a U-100 scale, 100 units represents 1 mL of liquid. This means 50 units represents 0.5 mL and 10 units represents 0.1 mL. The unit-to-volume relationship stays the same across the 30-unit, 50-unit and 100-unit capacity options; the selected capacity only changes the maximum shown by the visual.
Not every device has the same scale or smallest marking. The calculator can display decimal results that may not line up exactly with the markings on a physical device. Confirm its type and scale before interpreting any result.
Peptide calculator FAQs
Does this calculator tell me what dose to use?
No. It only converts a target quantity supplied by you into a liquid volume using the concentration figures you enter. It does not choose or recommend a target amount.
What is a peptide reconstitution calculator?
It is a concentration calculator that models how the amount in a vial relates to an entered liquid volume. It then converts a chosen quantity into the corresponding liquid volume.
Is 1 mL always 100 units?
Only on a U-100 scale. This page is specifically configured for U-100 measurements. Do not use the result for a different scale or device.
Why does the calculator show a capacity warning?
The calculated volume is larger than the capacity selected in the calculator. Recheck every input and the selected device capacity.
Does Helix Bio save the information I enter?
No. The calculation runs locally in your browser and the fields are not submitted to Helix Bio by this calculator.