Syringe Calculator
Convert IU, mL, mg & mcg
Use this conversion tool to check syringe marks against milliliters, milligrams, and micrograms after you have already confirmed the vial concentration.
Convert IU Marks, mL, mg & mcg
This calculator is a unit-conversion reference. Use it after you know the vial concentration and the syringe format you are reading.
For a standard U-100 insulin syringe, 100 units equals 1 mL and each small notch is 0.01 mL. Always check the barrel label before drawing a dose, because other syringe formats use different capacities or graduation patterns.
Use the output as a math check, then follow the product instructions or prescriber directions for the actual dose.
How To Read The Syringe
The markings on the syringe are volume markings, not a prescription. That makes them useful for vial-based products, but only if you are working from the correct concentration.
If you are using a compounded vial, write the concentration on the label before you inject. That makes it easier to reverse-check the math later and reduces the chance of a measurement error.
For branded GLP-1 pens, use the pen instructions instead of a syringe calculator. For vial-based products, use the vial concentration and the syringe markings together.
Safety Notes
This page does not tell you whether a medication is appropriate for self-administration. It only helps you convert between units once a clinician or pharmacy has already given you an injection plan.
If the syringe label does not clearly say U-100, do not assume the scale is the same. Confirm the device before drawing anything.
When in doubt, pause and check the prescription label or ask the pharmacist. The safest dose is the one that matches the actual device in your hand.
Frequently Asked Questions
On a U-100 syringe, 100 units equals 1 mL. For peptide or GLP-1 vial math, you use the marks as a volume reference, not as an insulin dose.
Use the device that matches your dose volume and the markings on the barrel. Read the syringe label carefully and confirm the graduation scale before drawing anything.
Follow the manufacturer or pharmacist instructions for your exact device. Removing obvious bubbles improves measurement accuracy, but the technique depends on the syringe and medication.
Yes. Shotlee can store dose logs, side effects, and health metrics alongside your injection history.
Track Your Syringe Protocol in Shotlee
Free dose logging, side effect tracking, and health metric monitoring for your complete protocol.