Peptide Syringe Calculator
Enter the units on the syringe and the solution’s concentration to see the volume and the amount those units hold. Switch to “mcg → mL” to go the other way. Both U-100 and U-40 syringes are covered.
Peptide Syringe Calculator
Vial amount ÷ liquid added. The reconstitution calculator works it out.
Enter the units on the syringe and the solution’s concentration.
Arithmetic only: it never suggests or assesses an amount. Nothing you type leaves your browser.
Reading a syringe in numbers
mL = units ÷ 100 (U-100) mL = units ÷ 40 (U-40)amount = mL × concentrationAt 2.5 mg/mL, 20 units on a U-100 syringe is 0.2 mL, which holds 0.5 mg (500 mcg). Each unit holds 25 mcg.
Amount per unit at common concentrations
| Concentration | Per unit | Per 10 units | Per 50 units |
|---|---|---|---|
| 1 mg/mL | 10 mcg | 100 mcg | 500 mcg |
| 2 mg/mL | 20 mcg | 200 mcg | 1,000 mcg |
| 2.5 mg/mL | 25 mcg | 250 mcg | 1,250 mcg |
| 5 mg/mL | 50 mcg | 500 mcg | 2,500 mcg |
U-100 and U-40 are different scales
Most insulin-style syringes are U-100. A U-40 syringe is marked 40 units per mL, so the same number of units is 2.5 times the volume. The calculator converts between them. More in insulin syringe units explained.
Syringe units are volume marks, not IU. IU depends on the substance; a syringe unit is always 0.01 mL on U-100.
Frequently asked questions
How many mL is 10 units on a syringe?
0.1 mL on a U-100 syringe, 0.25 mL on a U-40 syringe.
How much is in one unit?
The concentration ÷ 100 on a U-100 syringe. At 2.5 mg/mL, that is 25 mcg per unit.
Which syringe size reads small volumes best?
0.3 mL and 0.5 mL U-100 syringes are usually marked every unit, while 1 mL syringes are often marked every 2 units.
Related calculators and guides
- GuideInsulin Syringe Units Explained1 mL is 100 units on a U-100 syringe.
- CalculatorMcg to mL calculatorConvert mcg to mL using your solution’s concentration, with U-100 syringe units and the nearest marking.
- CalculatorUnit converterConvert peptide units exactly: mg to mcg, concentrations (mg/mL to mcg/mL), and syringe volumes between mL, U-100 and U-40 units.
- CalculatorReconstitution calculatorWork out concentration after adding bacteriostatic water, then the mL and U-100 units for any amount.
Powered by Peptide Library
Keep a record, not just a result
Peptide Library is the free research and tracking platform behind this calculator, on the web, iPhone and Android.
- Schedules and remindersPlan entries and get reminded, with a calendar of past and upcoming ones.
- Logs and journalA history of every entry, with notes and check-ins.
- InventoryWhat’s left in each vial, with run-out and reorder dates.
- Research libraryProfiles for 200+ peptides, side-by-side comparison and human evidence summaries.
Get the app: App Store (tracking, no calculator) · Google Play (tracking and calculators)
Last reviewed · How the calculations work