Converting U-100 markings and mL
Use this converter when the volume or the U-100 marking is already known. Edit either field to calculate the other. It does not require concentration, total mass or a target amount because it converts volume only.
Confirm that the actual device is labeled U-100. Its markings represent 100 units per mL. This relationship does not assign insulin activity to another substance, and it cannot convert mg, mcg or biological international units into mL.
A short reference you can reproduce
1 marking = 0.01 mL; 5 = 0.05 mL; 10 = 0.1 mL; 30 = 0.3 mL; 50 = 0.5 mL; 100 = 1 mL. Divide markings by 100 to recover mL. Multiply mL by 100 to recover markings.
mL × 100 = U-100; U-100 ÷ 100 = mLCapacity and graduation are separate
On a confirmed U-100 scale, 0.3 mL corresponds to 30 units regardless of barrel capacity. A 0.3 mL device cannot hold 0.5 mL. Devices can also have different graduation intervals; a decimal output does not establish a readable line or authorize rounding.
When this converter cannot answer
U-40 and other scales require different factors. If your question starts with a mass such as 250 mcg, first establish concentration and use the target-volume tool. This page does not choose equipment or explain administration.
Questions and answers
Are these international units for a peptide?
No. This page expresses a volume as markings on a U-100 scale. Biological activity units are substance-specific and cannot be inferred from this conversion.
Can I use the result on any syringe?
No. Check the printed scale, capacity and smallest graduation. This converter models U-100 only.
peptide syringe units calculator formulas, sources, and limits
The sources below support the unit definitions or product-specific limitations discussed on this page. They do not endorse this website or validate an input. Check the current source and product documentation before relying on a calculation.
Updated 2026-10-23. Check the equations in our calculation methodology. Read the medical disclaimer before using any output in a health-related context.