Dilution first. Dose second. Execution last.
Open: Peptide calculator
What the calculator does
- Does: converts a target dose (mcg/mg) into mL and syringe units using your vial mg + water mL.
- Does not: choose a protocol, pick a dose, or guarantee outcomes.
If you don’t understand the dilution, don’t trust the output.
Before you type anything
- Vial amount from the label (e.g. 5 mg, 10 mg).
- Water added in mL (exact volume you injected).
- Target dose in mcg (most peptide protocols are written in mcg).
- Syringe scale you’re using (common: 1 mL insulin syringe = 100 units).
Haven’t mixed yet? Start here: Peptide reconstitution basics.
The logic in one minute
The calculator works off concentration.
- Concentration = vial mg ÷ water mL
- Draw volume = target dose ÷ concentration
- Syringe units = that mL mapped to your syringe markings
More water doesn’t give you more peptide. It just spreads it thinner.
Step-by-step setup
1) Enter vial amount (mg)
- Use the exact mg printed on the vial.
- If the label is unclear, stop. Guessing makes every dose wrong.
2) Enter water added (mL)
- Enter the exact mL you injected during reconstitution.
- Don’t “top up later.” If you do, you must recalculate everything.
3) Enter target dose (mcg or mg)
- Match the unit to your protocol.
- 1 mg = 1000 mcg (this is the #1 mistake).
4) Confirm syringe scale
- Most insulin syringes: 1 mL = 100 units.
- If your syringe scale is different, “units” output won’t match your markings.
How to read the outputs
- mL to draw: the true liquid volume.
- Syringe units: where that volume lands on your syringe.
- Concentration: your dilution result (useful for sanity checking).
If you get something extreme (e.g. 2 units or 80 units), your inputs are usually wrong: vial mg, water mL, or mg vs mcg.
Common mistakes that waste vials
- mg vs mcg confusion (most common)
- Wrong water volume (guessing/rounding)
- Changing dilution mid-vial and forgetting
- Wrong syringe scale (units don’t match your syringe)
- Bad storage/handling (potency loss with no visible signs)
Storage guidance: Peptide storage & handling
Execution: draw cleanly and consistently
- Swab vial top every time and let it dry.
- Draw slowly; don’t slam air back into the vial.
- Use a repeatable routine to avoid misreading syringe marks.
Injection fundamentals: Injection technique & safety
Where to go next
Common questions
Can I choose a dilution just to make dosing easier?
Yes—if you measure it accurately and stick to it. People fail when they guess mL or change dilution later.
Why do peptides “stop working”?
Usually one of: unit mistake, dilution error, degraded peptide from storage/handling, or inconsistent execution. Verify inputs and storage before blaming the compound.
Do I need to recalc every injection?
No. If dilution and target dose stay the same, record the syringe units and execute consistently.
Key takeaways
- Dilution is the foundation.
- Most mistakes are mg vs mcg or wrong water volume.
- “Units” only matter if your syringe scale matches.
- Storage/handling can kill potency even if it looks normal.