A simple place to check the math

What DosePep is for

You might have a dose in milligrams (mg), a vial strength in mg per mL, and a syringe marked in units, and need someone to explain how they fit together. DosePep shows the math openly. Divide the dose in mg by the strength in mg per mL to get the amount of liquid in mL. Then multiply the mL by 100 to get units on a U-100 syringe (U-100 means 100 units fill 1 mL, so 1 unit is 0.01 mL). Our worked examples show the strength we used right next to the answer, so you can see which number changes the result.

The site also explains what the official labels say about pens, vials, the lines on a syringe, needle sizes, and some handling details. This is background reading, not a treatment plan. A brand-name pen may have a dose counter or give a set dose each time. A vial may have a different strength or a different amount of liquid. DosePep keeps pens and vials separate because the exact form of the medicine matters.

Who it is for, and who it is not

DosePep is for people who want a plain explanation before they check a conversion with the prescriber who set their medicine or their pharmacist. It is also for teachers who need a clear explanation of mg, mL and U-100 units. It is not for diagnosing a condition, choosing a medicine, deciding whether a dose is right, changing a schedule, or finding a product or a supplier. When we show a dose schedule from a label, that is not a recommendation.

How the calculator works

You tell the calculator whether your medicine is already a liquid or a powder you mix yourself. Then you enter the strength (or the mg in the vial and the water you add), your dose in mg or mcg, and your syringe size. It uses the same tested math as the reference tables on our other pages. It shows the amount in mL, the number of units, and warnings if the dose won't fit in the syringe or doesn't land on a line. It does not choose a dose. The numbers the calculator starts with are clearly marked as examples. They are no substitute for the exact label on the medicine in your hand.

Sources, review and responsibility

Every medical and device fact on this site is stored together with the source it came from. Each page lists its sources, so you can check the label, FDA notice, manufacturer guide, trial report or official standard behind a claim. When a source changes, we update that fact and every page that uses it at the same time. Ashley Alexis, ND reviewed the site’s calculators, dose pages, syringe guides and pen pages on September 30, 2026 for accuracy against the cited FDA labels and sources. That review is not medical advice to any individual.

Funding and errors

Funding disclosure: DosePep is paid for by its owner. It has no advertisers, sponsors or affiliate links, and no relationship with any drug maker, pharmacy, telehealth company or supplier. If that changes, this page will say so before any such link appears. If you find a wrong number, a broken source link, a misleading sentence, or an outdated label detail, please email hello@dosepep.com. Include the page address, the exact words or table cell, and, if you can, an original source or the section of the label. We check each report against our list of sources. If we accept it, we fix it both in our data and on the page you see.