mg, mcg, mL, and units explained
Most peptide calculation errors start with unit confusion. Vials are often labelled in mg, target doses may be written in mcg, and syringes are read in mL or units.
Key takeaways
- 1 mg equals 1,000 mcg.
- mL measures liquid volume, not peptide mass.
- Syringe units are markings that depend on the syringe type.
Educational use only
PepSync is an educational calculator and protocol-tracking tool. It does not diagnose, prescribe, or replace guidance from a licensed clinician or pharmacy. Always follow the instructions supplied with your medication or product.Mass vs volume
Milligrams and micrograms measure the amount of peptide. Millilitres measure how much liquid you draw. Reconstitution connects the two by creating a concentration.
Once you know concentration, the dose volume is the target dose divided by the amount of peptide in each mL.
- mg and mcg = amount of peptide
- mL = amount of liquid
- units = syringe markings
The most common conversion
The most common peptide conversion is mg to mcg. A 5 mg vial contains 5,000 mcg total. If that vial is mixed with 2 mL, each mL contains 2,500 mcg.
Where calculators help
A good calculator keeps the unit conversions visible instead of hiding them. That makes it easier to spot an entry error before the result reaches the syringe.
Sources used
Frequently asked questions
Is mcg smaller than mg?+
Yes. One milligram equals 1,000 micrograms.
Can I enter mg instead of mcg?+
Use the unit requested by the calculator field. If a field asks for mcg, multiply mg by 1,000 first.
Why do peptide calculators show both mL and units?+
mL is the actual draw volume. Units translate that volume to the printed markings on insulin syringes.