Sources we use
We rely on primary sources: U.S. regulators and agencies (FDA, CDC, NIST), the National Library of Medicine (MedlinePlus and DailyMed drug labels), the Institute for Safe Medication Practices, professional bodies such as the American Diabetes Association, and manufacturer specification sheets. We do not use sellers, forums or social media as sources of fact.
How calculators are checked
Every calculator uses published, standard formulas. The code is covered by automated tests that check known answers (for example, 2.5 mg of a 10 mg/mL liquid is 0.25 mL, or 25 units on a U-100 syringe, and 10 units of U-40 insulin is 0.25 mL). We show the formula next to each tool so anyone can verify the result by hand.
What we will not publish
- Dosing advice of any kind. The calculators convert the numbers you enter.
- Links to, reviews of, or discount codes for sellers of syringes, needles or medicines.
- Claims we cannot support with a source.
Updates and corrections
Each page shows the date it was last updated. When drug labels, safety guidance or manufacturer specifications change, we update the affected pages. If you find an error, tell us through the contact page and we will review it and correct it.