Peptide Syringe Units Calculator

Given a reconstituted vial and the amount you want to withdraw, this returns the exact volume, the reading in U-100 insulin-syringe units, and draws the fill line on a syringe. It is volume arithmetic for handling a research sample, not a dose.

Research use only. This converts a chosen amount into a draw volume and a syringe reading. It is not a dose, a dosing schedule, or a recommendation to administer anything, and nothing here is medical advice. On a U-100 syringe, 1 mL of volume reads as 100 units; the unit scale is a volume ruler, not a dose.

Inputs

Reconstitute the vial, pick the amount to withdraw, and read the volume and units below.

Peptide mass in the vial

Bacteriostatic water added

Amount to withdraw

Syringe barrel

Concentration

5 mg/mL

Volume to draw

0.05 mL

Draw to

5 units

Per unit

50 mcg

Fill line on the syringe

This volume is more than the selected barrel holds. Use a larger syringe or split the withdrawal.

Units shown are U-100 (1 mL = 100 units). Ticks scale to the selected barrel.

U-100 unit marks, precomputed

The same arithmetic as above, worked out ahead of time for common reconstituted concentrations. Read a row for the concentration in your vial and a column for a mark on the barrel; the cell is the peptide mass sitting in the barrel at that mark. These are volume readings on a U-100 ruler, not aliquots anyone is telling you to draw.

Peptide mass held at each U-100 unit mark, by concentration (1 unit = 0.01 mL)
Concentration	5 units	10 units	20 units	25 units	50 units	100 units
1 mg/mL	50 mcg	100 mcg	200 mcg	250 mcg	500 mcg	1 mg
2 mg/mL	100 mcg	200 mcg	400 mcg	500 mcg	1 mg	2 mg
2.5 mg/mL	125 mcg	250 mcg	500 mcg	625 mcg	1.25 mg	2.5 mg
5 mg/mL	250 mcg	500 mcg	1 mg	1.25 mg	2.5 mg	5 mg
10 mg/mL	500 mcg	1 mg	2 mg	2.5 mg	5 mg	10 mg
20 mg/mL	1 mg	2 mg	4 mg	5 mg	10 mg	20 mg

Column headings are unit marks on a U-100 barrel, so 5 units = 0.05 mL, 25 units = 0.25 mL, and 100 units = 1.00 mL. Every cell is concentration multiplied by that volume, nothing more.

Micrograms per single unit

The one figure worth memorising for a given vial: what one U-100 unit of that solution contains. It is simply the concentration in mg/mL multiplied by 10.

Micrograms of peptide contained in one U-100 unit (0.01 mL)
Concentration	Per 1 unit
1 mg/mL	10 mcg
2 mg/mL	20 mcg
2.5 mg/mL	25 mcg
5 mg/mL	50 mcg
10 mg/mL	100 mcg
20 mg/mL	200 mcg

Concentration itself comes from the vial: mg in the vial divided by mL of bacteriostatic water added. If the labelled mass is wrong, every number in both tables is wrong by the same factor, which is why the lot-matched third-party COA is the part that actually matters.

The math, in one line

First the concentration: mg/mL = vial mass (mg) ÷ water (mL). Then the volume for your amount: volume (mL) = amount (mg) ÷ concentration (mg/mL). On a U-100 syringe that volume reads as units = volume (mL) × 100, and each unit holds concentration × 10 micrograms. Every step is arithmetic on a volume you chose, not a dose anyone is telling you to take.

The whole chain rests on the vial actually containing the mass you typed, and the only trustworthy source for that is a lot-matched third-party COA rather than the number on the cap. Set the concentration with the reconstitution calculator, compare vials on cost per mg, and learn how to read the COA the mass depends on.

Disclosure: coaindex is a Pepora affiliate and earns a commission on code UTILITY15. Pepora is scored on the same published criteria as every other supplier in our vendor table at /vendors, where it currently does not rank first.

Every unit on this syringe assumes the vial really holds what the label claims.

Pepora publishes independently verifiable third-party COAs (Freedom Diagnostics, HPLC plus mass spec) you can look up by accession before you buy, so the mass behind these volumes is a checked figure rather than a label guess. It ships from the US.

See Pepora's verifiable COAs

Use code UTILITY15 for 15% off