About Vial to Units
A calculator for one job: turning a vial size, a volume of water and a prescribed dose into a concentration and a syringe marking.
What it does
You enter the amount printed on the vial, the water added to it and the dose on your prescription. The site divides and multiplies those numbers and shows the concentration, the volume to draw and the matching units on a U-100 insulin syringe. It can also run the other way, from units drawn back to the amount they contain.
The arithmetic is three lines long and is written out on the how it works page, so any result can be checked with a pocket calculator.
What it does not do
- No dose recommendations. The site never suggests a dose, a schedule or a protocol. The dose you enter is the one your prescriber gave you. The only pages that fill in a dose for you are the conversion charts, which use the figure named in the page address.
- No seller links. The site does not link to, rank or review peptide vendors.
- No judgement on a compound. Listing a compound means people look up the arithmetic for it. It is not a statement that the compound is safe, effective or approved. Each compound page states its US regulatory status.
How results are tested
All calculations come from one small file of arithmetic. The calculator in your browser, the conversion charts on the site and an automated test suite all use that same file, so they cannot disagree with each other.
The tests compare the output with examples worked by hand, including these:
| Vial | Water | Dose | Expected result |
|---|---|---|---|
| 10 mg | 2 mL | 2.5 mg | 5 mg/mL, 0.5 mL, 50 units |
| 5 mg | 2 mL | 250 mcg | 2.5 mg/mL, 0.1 mL, 10 units |
| 10 IU | 1 mL | 2 IU | 10 IU/mL, 0.2 mL, 20 units |
The tests also cover the reverse direction, empty or zero inputs, and rounding. Results are shown to at most four significant figures.
A calculator can only be as right as the numbers typed into it. Check every result against your vial label and prescription, and ask your pharmacist if anything looks off.
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