How the calculator does the math

Use the dose you were given. This tool does math only. It does not pick a dose.

Strength = amount in the vial ÷ water in mL.
Shot mL = your dose ÷ strength.
U-100 syringe units = shot mL × 100.

Example 1 · mg

Math example, not a dose plan: 10 mg in a vial with 2 mL water gives 5 mg/mL. An entered dose of 1 mg takes 0.2 mL, or 20 units on a U-100 syringe.

Example 2 · mcg

Math example, not a dose plan: 5 mg in a vial with 2 mL water gives 2.5 mg/mL. An entered dose of 250 mcg is 0.25 mg. That takes 0.1 mL, or 10 units on a U-100 syringe.

U-100 units to mL

Common questions

Does this tool tell me which dose to take?

No. Enter the dose you were given. The tool only works out water, strength and draw size.

What is bac water?

Bac water is short for bacteriostatic water. In this tool, water is the liquid added to a powder vial.

Are syringe units the same as mg or IU?

No. U-100 syringe units measure liquid volume. Mg and mcg measure mass. IU on a vial is not a syringe unit. The tool uses IU only when both the vial and dose use IU.

Can I change the water amount?

Yes, before mixing. Use the water buttons on the result card. The amount must fit the vial. The tool caps water at 3 mL unless it is a high-volume vial. For a vial already mixed, use the water you added.

Do I need shots per week?

Not for a per-shot dose. Add shots per week to see days of supply. For a weekly total, the tool needs that count to split the total into shots.

Report a calculation problem · Changes to this tool