Vial

A calculator and a record for reconstituted vials and pens

You type the numbers. Vial does the arithmetic, and prints the expression behind every figure it shows.

Vial's home screen, listing a vial with its concentration and remaining volume above a pen with its mass per click. — The home screen: what you entered, and what is left.

What it calculates

Concentration, as compound mass divided by diluent volume
Draw volume, as target dose divided by concentration
Syringe units, as draw volume times the selected barrel's units per millilitre
Remaining volume, as diluent volume less the draw volumes you have recorded
For pens, mass per increment, as total mass divided by total increments

Every result is printed beside its working. Under a draw volume you see = 250 µg × 2000 µL ÷ 5000 µg. Nothing is hidden, and nothing is assumed on your behalf.

What it does not do

No substance database and no drug information. No dose defaults, suggestions or ranges. No schedules, protocols or cycles. No reminders. No expiry or discard dates. Vial never phrases a result as an instruction: it shows "10 units", never "draw 10 units".

Vial is arithmetic on numbers you enter. It is not medical advice, it makes no claim of diagnosis, treatment, prevention or mitigation, and it is no substitute for the judgement of a qualified professional.

What it costs

One vial or one pen is free for the lifetime of the install, and it is the complete app. Quick Calc is unlimited and free. Export and import are free at every tier.

Two plans remove the limit on vials and pens, and nothing else. Lifetime is one payment of $19.99 with nothing renewing. Weekly is $4.99, renewing until you cancel it in the App Store.

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