Bench tools · No. 03

What a mark is worth.

Concentration, both ways.

A solution you already have, read in whichever direction you are thinking. Type into any field; the rest follow.

Barrel scale1 unit = 0.01 mL

Strength

Concentrationmg/mL

Mass per unit markmcg

The draw

VolumemL

Units on the barrelu

That draw contains

2.500mg(2500 mcg)

This lands on a readable graduation.

Scale mismatch

These units are marks on a U-100 barrel. Draw the same count on a U-40 and it carries 2.50× the mass, because one mark there is 0.025 mL rather than 0.01 mL. Check the barrel, not the box.

What each barrel holds

Barrel	Capacity	Most mass in one draw
1.00 mL	100 u	5 mg
0.50 mL	50 u	2.500 mg
0.30 mL	30 u	1.500 mg

Barrel size sets how much fits in one draw, and nothing else. Mass per unit mark is 50 mcg on every one of them, because a 1 mL, 0.5 mL and 0.3 mL insulin syringe are the same U-100 scale at different capacities. Only changing the scale above changes what a mark is worth.

Figures describe solution chemistry only. Nothing here is a protocol, a schedule, or a recommendation, get your target from a licensed provider.

Starting from a vial rather than a solution? The reconstitution calculator takes mass and diluent and returns the draw, including where the barrel cannot measure what you asked for.

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