insulin syringe calculator
Calculator / Reference

0.3, 0.5 and 1 mL syringe sizes

Compare U-100 barrel capacities and marked divisions without confusing syringe size with concentration.

01

Enter your volume

mL
02 Match your syringe

All three use the U-100 scale: 100 units per mL.

Only for U-100 syringe markings. Check the scale printed on the barrel.

YOUR CALCULATION On your device

A little clarity, in units.

Enter your values and select the markings on your syringe. Your result and the full arithmetic will appear here.

NEEDLE ENDSELECT YOUR SYRINGE
Illustration only. Read the plunger edge nearest the needle. Check the markings on your actual syringe.

Measurement, not medical advice. Confirm your prescribed amount and how to measure it with your prescriber or pharmacist. This tool does not calculate an insulin dose or convert biological IU to mg.

No account. No tracking. Just the calculation.

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THE REFERENCE

Supported U-100 configurations
CapacityMaximum markingsSupported small divisions
0.3 mL30 units0.5 or 1 unit
0.5 mL50 units1 unit
1 mL100 units1 or 2 units

Size is capacity; U-100 is the scale

The three common capacities hold 30, 50 or 100 markings on the U-100 scale. In each case, 10 markings still represent 0.1 mL. Terms such as “U-30” or “U-50” can confuse the barrel’s capacity with its scale, so this site labels capacity in mL.

Graduations vary by product

A barrel size does not uniquely determine its line spacing. For this tool, choose the actual 1- or 2-unit divisions on a 1 mL barrel, 1-unit divisions on a 0.5 mL barrel, or half-unit or 1-unit divisions on a 0.3 mL barrel. If your device differs, do not substitute the nearest option.

Match the actual equipment

The comparison explains what the markings mean, not which equipment you should use. Your prescriber or pharmacist can confirm a syringe that accommodates and clearly measures your prescribed volume. Needle length and gauge are outside this calculator’s scope.

Reference: BD: syringe capacities and scale options. Sources checked 11 September 2026. This is not a clinical review of the calculator.