U-100 syringe conversion chart
AT A GLANCE
The U-100 volume scale is 100 markings per 1 mL: 10 markings represent 0.1 mL, 25 represent 0.25 mL and 50 represent 0.5 mL. The chart below contains volume conversions only.
For U-100 volume markings only. Keep mass units consistent: 1 mg = 1,000 mcg.
| Markings | Volume | Fits within capacity |
|---|---|---|
| 5 units | 0.05 mL | 0.3, 0.5 or 1 mL |
| 10 units | 0.10 mL | 0.3, 0.5 or 1 mL |
| 15 units | 0.15 mL | 0.3, 0.5 or 1 mL |
| 20 units | 0.20 mL | 0.3, 0.5 or 1 mL |
| 25 units | 0.25 mL | 0.3, 0.5 or 1 mL |
| 30 units | 0.30 mL | 0.3, 0.5 or 1 mL |
| 40 units | 0.40 mL | 0.5 or 1 mL |
| 50 units | 0.50 mL | 0.5 or 1 mL |
| 75 units | 0.75 mL | 1 mL |
| 100 units | 1.00 mL | 1 mL |
A worked example
30 markings ÷ 100 = 0.30 mL. This is the maximum marked volume of a 0.3 mL U-100 barrel.
Reading this chart
The table uses 100 U-100 markings per millilitre. It does not assign a medicine dose or a mass to any row. Only entries within the capacity of your actual syringe can fit in one barrel.
Print your own calculation
Enter the volume and actual syringe markings in the calculator, then select Print summary. The printed card includes your original entries, the result, any rounding difference, the diagram and the arithmetic. No email address is needed.
A chart cannot check your label
This reference does not apply to a different syringe scale. Check for U-100 on the packaging and barrel. If the prescription, vial and syringe use different units, have a pharmacist reconcile them rather than guessing.
What this conversion cannot tell you
These rows do not specify a dose. Mass requires a known concentration; biological activity requires substance-specific information.
Source: BD: U-100 syringe capacities and markings. Supports the device scale and capacity context. Formula examples are arithmetic derived from the stated U-100 scale. Source checked 17 October 2026. This checks the cited device or unit context, not treatment suitability.
A blank calculator, transparent arithmetic and a close-up of your selected scale.