Calculator
Cost-Per-Dose Calculator
A price per month tells you what leaves your account. It does not tell you what you are paying for the drug, which is the only figure that lets you compare a 10 mg vial against a pen against a compounded shipment. Enter what you paid, what is in the box, and the dose you already take — and see the per-milligram rate, the per-dose cost, and the remainder you paid for and cannot use.
Calculator
The total actually charged for the vial, pen, box or shipment in front of you — not a monthly membership figure, and not an advertised rate.
The milligrams the label says the supply contains in total. This tool has no product database — the number comes off your own box.
The size of one of your doses. Nothing here is suggested and nothing is filled in — this is the figure you already have from the clinician who prescribes it.
How many of those doses you take in a week. Used only to turn a cost per dose into a weekly and an annual figure.
Fill in all four boxes, each greater than zero, to see what a dose actually costs you. Nothing is computed until then — a total built on a blank field would be a made-up number.
Why a price per month hides the real one
The same headline price buys wildly different amounts of drug. A membership at one price may cover a fixed dose that never changes; another at the same price supplies a vial you draw from until it is empty. Read as monthly figures they look comparable. Divided by the milligrams in the box they frequently are not, and the direction of the gap is not predictable from the headline.
A cost per milligram is also the only figure that survives a dose change. When a dose goes up, a per-month price either goes up with it or the supply runs out sooner — and which of those happens is a fact about a provider's plan, not about the drug. The per-milligram rate stays put and lets you see what the increase actually costs.
The remainder nobody prices
A supply almost never divides evenly into doses. What is left when the last whole dose has been drawn is drug you paid for and cannot use, and no advertised price on this category accounts for it. The calculator prices that remainder at your own per-milligram rate, because it is a real cost sitting in a real vial.
It is also the reason two supplies at an identical price per milligram are not necessarily the same deal: the one whose contents divide cleanly into your dose wastes nothing, and the one that leaves a third of a dose behind every time does not.
What this calculator does not tell you
Key terms
- Cost per milligram
- The supply price divided by the total milligrams in it. The one figure that lets two differently packaged supplies be compared directly.
- Stranded drug
- What is left in a supply once every whole dose has been drawn — paid for, and not usable as a full dose. Priced here at your own cost per milligram.
- Whole doses per supply
- The supply's total milligrams divided by your dose size, rounded down. A partial dose is not a dose.
- Annualised on 52 weeks
- A weekly regimen is counted by the week, not by the month — the same reason our boards count 13 four-weekly charges a year rather than 12.
This tool performs arithmetic only. It is not medical or financial advice, it recommends no dose and no provider, and it knows nothing about any company's pricing beyond what you type. For prices we have verified first-party against a provider's own checkout, see our price-honesty boards.