What this tool solves
U-100 syringes show 100 marks per mL. This tool connects those marks to your vial concentration so the visual guide can show where the plunger should stop.
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Syringe mark calculator
Free U-100 Syringe Units Calculator
Convert peptide dose math into U-100 syringe marks after entering vial strength, BAC water, and target dose.
Free U-100 syringe units calculator for BAC water, dose volume, and U-100 syringe mark math.
U-100 marksBAC water mathmL to draw
Math support only
This page is for calculator math and education. It does not diagnose, prescribe, or replace product-label or prescriber instructions.Example calculation
U-100 syringe units calculator example
This example shows how a U-100 mark is a volume marker. The amount at that mark depends on the concentration created by the vial and BAC water values.
- Vial amount
- 5 mg total
- BAC water added
- 1 mL
- Example dose
- 250 mcg
- Concentration
- 5,000 mcg/mL
- Liquid to draw
- 0.05 mL
- U-100 syringe
- 5th mark
In this example, the visual syringe guide would point to the 5th mark. Change the vial, water, or dose values in the calculator to match the exact instructions you are using.
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Why marks are not a dose by themselves
A syringe mark only tells you volume. The amount of compound at that mark depends on how many mg are in the vial and how much BAC water was added.
Best use
Use it after you already know the exact vial amount, water amount, and target dose from a reliable instruction source.
Frequently asked questions
Is a U-100 unit the same as an International Unit?
Not here. PeptiCalc uses the U-100 mark scale for syringe volume. True International Unit conversions must come from compound-specific labeling.
Is this a prescription or protocol?
No. PeptiCalc is a measurement calculator. It helps translate vial strength, BAC water, and a selected dose into syringe marks, but it does not prescribe treatment.
Can I edit the preloaded values?
Yes. Every value that opens in the calculator is editable, including vial amount, BAC water, syringe size, and dose.
Why do syringe marks matter?
Most U-100 insulin syringes show 100 marks per mL. The calculator converts the liquid dose into the mark to pull to on that syringe scale.