Peptide Calculator
Reconstitution and dose maths: how much water to add and how many syringe units to draw.
Peptide Dose Calculator
New here? Use the BAC Water tab first to work out how much water to add, then come back to convert your dose to syringe units.
BAC Water Calculator
Work out how much bacteriostatic water to add so that your dose lands on an easy syringe mark.
How the Math Works
- Concentration = mg of peptide ÷ mL of water. A 5 mg vial in 2 mL is 2.5 mg/mL (2,500 mcg/mL).
- Volume to draw = dose ÷ concentration. 250 mcg at 2,500 mcg/mL is 0.1 mL.
- Syringe units: on a 100-unit (1 mL) insulin syringe, 1 unit is 0.01 mL, so 0.1 mL is 10 units.
- Less water means a higher concentration and fewer units per dose. More water means more units per dose and easier reading.
- Doses per vial = total peptide ÷ dose. This ignores small losses in the needle and vial.
Step-by-step: how to reconstitute · measurement guide · dosing guide
FAQ
Is this medical advice?
No. It only does arithmetic on the numbers you enter. It does not tell you what dose is right or safe for anyone.
Why do the sample values differ from other sources?
There is no official dosing standard for most peptides, and published protocols disagree. The sample values match our dosing guides and are only starting points for the math.
Does the result change if I use more water?
Yes. More water lowers the concentration, so the same dose takes more syringe units. Always recalculate if you change the water amount.
What if the draw is more than the syringe holds?
Use less water for a higher concentration, a larger syringe, or split the volume. The calculator warns you when this happens.
Educational maths tool only. Not medical advice. Results are provided as-is without warranty. Always check your numbers twice and speak to a licensed healthcare professional about your health.