Laboratory tool
Peptide calculator
Step 1 — Vial
Step 2 — Result
2.50 mg/mL
2500.00 mcg/mL
25.00 mcg per unit
Step 3 — Draw
Draw 0.100 mL = 10.0 units
Doses per vial: 20.0
How the calculation works
Concentration equals peptide mass divided by diluent volume.
Draw volume equals target amount divided by concentration.
For a U-100 syringe, units equal draw volume multiplied by 100 units per mL. Different syringe sizes change capacity and the displayed scale, not the liquid volume.
concentration = peptide mass ÷ diluent volume draw volume = target amount ÷ concentration U-100 units = draw volume × 100
Worked example
A 5 mg vial with 2 mL diluent has a concentration of 2.5 mg/mL, or 2,500 mcg/mL. A 250 mcg target equals 0.1 mL, shown as 10 units on a U-100 syringe. The vial contains 20 such draws.
Frequently asked questions
What is reconstitution?+
In a laboratory record, reconstitution is the addition of a measured liquid volume to a dry material to produce a solution of calculable concentration.
Does the diluent volume change the total peptide in the vial?+
No. It changes concentration, not the total peptide mass entered for the vial.
Why do results differ between syringe sizes?+
The calculated liquid volume is the same. The graphic and available markings change with syringe capacity; standard U-100 markings represent 100 units per mL.
What diluent do the calculations assume?+
None. The arithmetic is volume-based and does not select or recommend a diluent.
Read how administration frequency is reported in published study designs in the frequency guide.
Batch certificates
Batch certificates for every compound are on the supplier catalog.
Reference tool for laboratory preparation. For research use only.
Research use only
For laboratory research use only. Not for human or veterinary consumption. Not a drug, food, or dietary supplement. Not for diagnostic or therapeutic use. All materials referenced on this site are supplied to qualified laboratories and research institutions for in-vitro and analytical work.