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mL to Syringe Units Calculator — U-100 vs U-40

Convert a draw volume in millilitres to insulin syringe units for both U-100 and U-40 syringes simultaneously. Mixing up syringe types is one of the most common and consequential errors in peptide research — this tool shows both conversions side by side so you always use the right scale.

Common research range for BPC-157: 250–500 mcg, 2× daily, subcutaneous. Cycle: 4 weeks on / 2 off.

Educational use only. This calculator performs unit math on the values you provide and is not a substitute for medical advice. Verify every calculation independently.

Result

Concentration
2500 mcg / mL
Per syringe unit
25.00 mcg / unit
Draw to this mark
15.0 units (0.15 mL)
Dose, all units
375 mcg · 0.375 mg
Doses per vial
13.3 doses
Days per vial
6.7 days
Vials needed for 4-week cycle
5 vials

Numbers are computed from your inputs. Verify all calculations independently. Educational use only.

How to Use This Calculator

  1. Identify your syringe type: Check your syringe label for U-100 or U-40. This is the most critical step — the wrong assumption causes a 2.5× dosing error.
  2. Enter the draw volume in mL: Input the volume you need to draw in mL. This comes from dividing your dose (mcg) by the concentration (mcg/mL).
  3. Read U-100 units: The calculator multiplies mL × 100 to give units for a U-100 syringe.
  4. Read U-40 units: The calculator simultaneously shows mL × 40 for a U-40 syringe, allowing direct side-by-side comparison.
  5. Mark the syringe: Locate the unit line on your syringe that matches the calculated value and draw to that mark.

Example Calculation

A researcher needs to draw 0.15 mL of reconstituted peptide. They want to confirm the correct syringe mark for both syringe types.

Syringe TypeFormulaUnits to drawSyringe mark
U-1000.15 × 10015 units15 line on U-100
U-400.15 × 406 units6 line on U-40

U-100 Syringe Reference Table

mL volumeU-100 unitsU-40 units
0.05 mL5 units2 units
0.10 mL10 units4 units
0.15 mL15 units6 units
0.20 mL20 units8 units
0.25 mL25 units10 units
0.30 mL30 units12 units
0.40 mL40 units16 units
0.50 mL50 units20 units
0.75 mL75 units30 units
1.00 mL100 units40 units

Syringe Type Comparison

FeatureU-100U-40
Units per mL10040
mL per unit0.01 mL0.025 mL
Common volumes0.3, 0.5, 1 mL0.5, 1 mL
Primary usePeptide research, human insulinVeterinary insulin
Needle gauge typical28–31G25–28G

Frequently asked questions

How do I convert mL to U-100 insulin syringe units?+

Multiply the volume in mL by 100. Examples: 0.10 mL = 10 units; 0.25 mL = 25 units; 0.50 mL = 50 units; 1.00 mL = 100 units. This works because U-100 syringes hold exactly 100 units per 1 mL.

How do I convert mL to U-40 insulin syringe units?+

Multiply the volume in mL by 40. Examples: 0.10 mL = 4 units; 0.25 mL = 10 units; 0.50 mL = 20 units; 1.00 mL = 40 units. U-40 syringes hold 40 units per 1 mL.

What happens if I use a U-40 syringe thinking it is U-100?+

This is a serious dosing error. A U-40 syringe reads 2.5× more units than a U-100 syringe for the same volume. If you draw 10 units on a U-40 syringe thinking it is U-100, you are actually drawing 0.25 mL instead of 0.10 mL — getting 2.5× the intended dose. Always verify the syringe type before drawing.

Which syringe type is more common for peptide research?+

U-100 insulin syringes are by far the most common for peptide research. U-40 syringes are mostly used in veterinary contexts. Unless your protocol or supplier specifically states U-40, assume U-100.

How do I know what type of syringe I have?+

Check the barrel of the syringe for a printed label or the packaging for 'U-100' or 'U-40'. U-100 syringes are typically marked with 'U-100' and the scale goes to 100 on a 1 mL syringe. Some U-100 syringes only go to 50 or 30 (0.5 mL and 0.3 mL versions) — but the unit density is still 100 units/mL.

What is the mL equivalent of 10 units on a U-100 syringe?+

10 units on a U-100 syringe = 0.10 mL. This is one of the most useful benchmarks: 10 U-100 units = 0.1 mL, so 20 units = 0.2 mL, 50 units = 0.5 mL, and 100 units = 1.0 mL.