Syringe Calculator
This tells you which line to pull the plunger to on a U-100 (1 mL) or 30-unit (0.3 mL) insulin syringe for your dose, and warns you if the draw would overfill the syringe.
Step 1 · Vial strength
This is printed on your vial or the product listing. Common amounts are 2mg, 5mg, and 10mg.
How it works
- Enter your vial strength in milligrams.
- Enter your target dose in mcg or mg.
- Choose a 100-unit (1 mL) or 30-unit (0.3 mL) insulin syringe.
- See the exact units to draw, marked against your syringe.
Frequently asked questions
How many units are on an insulin syringe?
A standard U-100 syringe holds 100 units across 1 mL. Smaller syringes hold 30 units (0.3 mL) or 50 units (0.5 mL). All of them use the same U-100 calibration, so the unit markings mean the same volume on each.
What does one unit equal in mL?
On any U-100 insulin syringe, 1 unit equals 0.01 mL. So 50 units is 0.5 mL and 10 units is 0.1 mL. This calculator converts your peptide dose into units so you can draw it without doing the conversion yourself.
What if my dose is more units than my syringe holds?
The calculator flags it when the draw exceeds your syringe's capacity. You can either add more bacteriostatic water to lower the concentration, or split the dose across two draws. Adding more water means more volume per dose, which puts the draw back within range.
Can I use the same syringe math for any peptide?
Yes. The units-per-mL conversion is the same for any compound — what changes is your vial strength, how much water you reconstitute with, and your dose. Enter those and the syringe math works for BPC-157, semaglutide, TB-500, or anything else.
Track your protocol in DoneDose
DoneDose logs your doses, tracks serum levels over time, and reminds you when to inject next.
Related calculators & guides
This calculator is for informational purposes. Consult your prescribing provider for medical advice specific to your protocol. DoneDose does not provide medical advice.