Insulin syringe units to mL: chart, formula, or skip it
The short answer
On a U-100 insulin syringe, 100 units equal 1 mL, so 1 unit is 0.01 mL. To convert, divide the units by 100: 10 units is 0.1 mL, 25 units is 0.25 mL and 50 units is 0.5 mL. Going the other way, multiply mL by 100. Units on the barrel measure volume only; how much of a medication is in that volume depends on the concentration printed on the vial label.
U-100 insulin syringe units to mL chart
Every value below is the same division: units 梅 100. The third column shows which standard U-100 syringe can hold that volume in one draw.
| Units | mL | Fits in |
|---|---|---|
| 1 unit | 0.01 mL | 0.3, 0.5 or 1 mL |
| 2 units | 0.02 mL | 0.3, 0.5 or 1 mL |
| 3 units | 0.03 mL | 0.3, 0.5 or 1 mL |
| 4 units | 0.04 mL | 0.3, 0.5 or 1 mL |
| 5 units | 0.05 mL | 0.3, 0.5 or 1 mL |
| 6 units | 0.06 mL | 0.3, 0.5 or 1 mL |
| 7 units | 0.07 mL | 0.3, 0.5 or 1 mL |
| 8 units | 0.08 mL | 0.3, 0.5 or 1 mL |
| 9 units | 0.09 mL | 0.3, 0.5 or 1 mL |
| 10 units | 0.1 mL | 0.3, 0.5 or 1 mL |
| 15 units | 0.15 mL | 0.3, 0.5 or 1 mL |
| 20 units | 0.2 mL | 0.3, 0.5 or 1 mL |
| 25 units | 0.25 mL | 0.3, 0.5 or 1 mL |
| 30 units | 0.3 mL | 0.3, 0.5 or 1 mL |
| 35 units | 0.35 mL | 0.5 or 1 mL |
| 40 units | 0.4 mL | 0.5 or 1 mL |
| 45 units | 0.45 mL | 0.5 or 1 mL |
| 50 units | 0.5 mL | 0.5 or 1 mL |
| 55 units | 0.55 mL | 1 mL |
| 60 units | 0.6 mL | 1 mL |
| 65 units | 0.65 mL | 1 mL |
| 70 units | 0.7 mL | 1 mL |
| 75 units | 0.75 mL | 1 mL |
| 80 units | 0.8 mL | 1 mL |
| 85 units | 0.85 mL | 1 mL |
| 90 units | 0.9 mL | 1 mL |
| 95 units | 0.95 mL | 1 mL |
| 100 units | 1 mL | 1 mL |
Values in between follow the same rule: 12 units is 0.12 mL, 33 units is 0.33 mL, 68 units is 0.68 mL.
Or skip the mixing: prescribed and pre-mixed
How do you convert units to mL?
- Units to mL: mL = units 梅 100. Example: 35 units 梅 100 = 0.35 mL.
- mL to units: units = mL 脳 100. Example: 0.2 mL 脳 100 = 20 units.
- Why 100: "U-100" means the syringe is scaled for 100 units in every milliliter. It is printed on the package and usually on the barrel.
- U-40 is different: U-40 syringes hold 40 units per mL, so 1 unit is 0.025 mL. Mixing up U-40 and U-100 changes the volume by two and a half times. Never read one with the other's chart.
Units on the barrel never tell you how much active ingredient you are drawing. That depends on the concentration of the liquid in the vial, which is why a vial you mix yourself from powder adds a second calculation. Our peptide calculator does that arithmetic from the numbers on a label; it does not suggest a dose.
Which insulin syringe size shows which units?
| Syringe | Holds | Line spacing | Good for |
|---|---|---|---|
| 0.3 mL (3/10 cc) | 30 units | Usually every 1 unit; some have half-unit marks | Small volumes, easier to read |
| 0.5 mL (1/2 cc) | 50 units | Usually every 1 unit | Volumes up to 0.5 mL |
| 1 mL (1 cc) | 100 units | Usually every 2 units | Volumes up to 1 mL |
Line spacing varies by brand; read the scale printed on your own syringe.
How do you read an insulin syringe?
- Check the U number on the package: U-100 or U-40.
- Check the size: 0.3, 0.5 or 1 mL, and how many units each small line is worth.
- Read at the plunger's top edge, the flat edge nearest the needle, not the tip of the cone.
- Remove air bubbles before reading; a bubble takes up volume.
- Follow your prescription label. The volume to draw comes from your prescriber or pharmacist, never from a chart.
Or skip it: a pre-mixed, labeled vial
Units-to-mL math often starts with a vial of powder: mix it with bacteriostatic water, then work out what to draw. A prescription removes the mixing step. At Peptides.build a licensed US provider reviews a five-minute intake, and a licensed 503A pharmacy ships the protocol cold-chain, already reconstituted and labeled with the concentration: BPC-157 from $158/mo on 6 months. See pre-mixed peptides and BPC-157 pricing.
Prescribed by a provider. Made by a pharmacy. Verified.
No powder, no mixing math. Prescribed BPC-157, pharmacy-labeled with its concentration.
FAQ
How many mL is 10 units on an insulin syringe?
0.1 mL on a U-100 syringe. Divide the units by 100: 10 梅 100 = 0.1.
Is 10 units equal to 1 mL?
No. On a U-100 syringe, 10 units is 0.1 mL. It takes 100 units to make 1 mL.
Is 20 units 0.5 mL?
No. 20 units is 0.2 mL on a U-100 syringe. 0.5 mL is 50 units.
Is 50 units the same as 0.5 mL?
Yes, on a U-100 syringe. 50 梅 100 = 0.5 mL, which also fills a 0.5 mL syringe to its top line.
Is 5 units 0.5 mL?
No. 5 units is 0.05 mL. 0.5 mL is 50 units, ten times more.
Is 40 units equal to 1 mL?
Only on a U-40 syringe, which is marked for 40 units per mL. On the far more common U-100 syringe, 40 units is 0.4 mL. Check the U number printed on the syringe package before you read the barrel.
Is a milligram the same as a unit on the syringe?
No. A unit on the barrel is a measure of volume (0.01 mL on U-100). A milligram is an amount of a substance. Converting one to the other needs the concentration on the vial label, so ask the prescriber or pharmacist, or use a calculator with the label in front of you.
What are the different insulin syringe sizes?
The common U-100 sizes are 0.3 mL (30 units), 0.5 mL (50 units) and 1 mL (100 units). The smaller the syringe, the more space between each line, which makes small volumes easier to read.
Can I skip the units math entirely?
With a prescribed, pre-mixed vial, much of it. At Peptides.build a licensed 503A pharmacy ships the protocol already reconstituted and labeled with its concentration, so there is no powder to mix. BPC-157 is $163 month to month or $158/mo on 6 months. Your prescriber's instructions still tell you what to draw.
Or skip the math: pre-mixed
A licensed US provider reviews a short online intake. If a prescription is appropriate, a licensed US 503A pharmacy fills it and ships it cold-chain, already reconstituted and labeled with the concentration.
This page is educational and is not medical advice. Compounded medications are not FDA-approved. No results are implied or guaranteed. A licensed provider decides whether any protocol is appropriate for you, and sets any dose.