Syringe Unit Converter
Convert between insulin units (IU), milliliters (mL), and cc across U-40, U-100, and U-500 syringe types.
U-100 = 100 IU per mL · Standard insulin syringe (most common)
Enter a value above to see the conversion
Understanding Syringe Types
U-40
40 IU per mL. Older standard, still common in some countries and veterinary use. Rare for peptides.
U-100
100 IU per mL. The worldwide standard for insulin and most peptide protocols. What most guides assume.
U-500
500 IU per mL. High-concentration syringe for concentrated insulin preparations. Uncommon for peptides.
⚠️ Critical: Always confirm your syringe type
Using a U-40 syringe when a protocol calls for U-100 means you are drawing 2.5× the intended volume. Using U-100 with a U-40 calculation means you're underdosing. Always check the syringe label before drawing.