PeptideGeekThree quick questions
Peptide dosing calculator
What's in your vial, how much water you mixed in, and how much you want to take — answer those three and it tells you exactly where to pull the plunger on a standard insulin syringe. The same calculator that powers Peptide Initiative.
The math, in plain words
How the calculator works
Step 1
Your bottle
The number on the vial label — like 5 mg — is the total peptide inside. Labeled in mcg or IU? Switch the unit on the display.
Step 2
The water
The bacteriostatic water you added when you mixed the vial, in mL. Most kits use 2 mL. This sets the concentration.
Step 3
Your dose
How much you want in one injection. The result is the syringe mark: units on a standard insulin syringe, where 100 units = 1 mL.
Why the answer is in “units”
Insulin syringes — the ones nearly everyone uses for peptides — are marked in units, not millilitres. 100 units is 1 mL. The calculator does the concentration math (total peptide ÷ water = strength per mL, then your dose ÷ strength) and converts straight to the mark you pull the plunger to, so there's nothing to work out at the counter.
A note on IU
A few compounds — HGH, HCG, oxytocin — are labeled in IU, a per-compound potency unit that doesn't convert to milligrams by any universal factor. The calculator handles an IU bottle with an IU dose directly, converts IU↔mg only for compounds with a published reference standard (HGH's 3 IU/mg), and refuses to guess for everything else.
This calculator is an arithmetic tool, not medical advice. Doses belong to you and your clinician; the math belongs to us.
Looking for a specific peptide's numbers?
Every guide carries the same calculator preloaded with that peptide's own recorded doses — open a guide and the “Find dose amount” list fills itself.
Browse all peptide guides