Adherence rate calculator

“How consistent have you been?” is hard to answer honestly from memory. This turns a count into the percentage, which is the form the question is usually asked in.

Where the 80% figure comes from

Research and insurers commonly use 80% as the line between adherent and non-adherent, usually measured as proportion of days covered. It is a blunt convention rather than a medical fact, and it exists because it is easy to compute from refill records at scale.

For some medications 80% is generously loose — a short antibiotic course or an antiretroviral needs far better than that. For others, missing one dose in five genuinely does not matter much. Which category yours is in is worth asking about directly.

The number is the start of the conversation, not the end

A percentage tells a doctor how much of the prescribed treatment actually happened, which changes how they read everything else: whether a medication is not working, or simply was not taken often enough to find out.

What it does not carry is the reason, and the reason is the part that can be fixed. Doses missed because of side effects, cost, a schedule that does not fit your day, or a routine that collapses at weekends all look identical as a number and need completely different answers.

Counting honestly

Two habits make this figure mean something. Count a fixed period rather than “lately”, and count doses rather than days — a twice-daily medication where you always catch the morning and often miss the evening is a 50% day, not a good one.

If you are guessing at the missed count, the figure is a guess too. An organizer shows you this week and nothing else, which is exactly the limit the organizer write-up gets into. Doz records each dose as you mark it, so the count is a record rather than a reconstruction.

Common questions

How do you calculate medication adherence rate?

Divide the doses you actually took by the doses that were scheduled, then multiply by 100. Over 30 days on a twice-daily medication there are 60 scheduled doses, so missing 4 gives 56 of 60, or 93.3%.

What counts as good medication adherence?

80% is the threshold used in most research and by insurers, usually measured as proportion of days covered. It is a convention rather than a medical fact: some medications need far better than 80%, and for others it matters much less. Ask which yours is.

Should I count days or doses?

Doses. If you take something twice a day and reliably catch the morning while missing the evening, counting days makes it look like perfect adherence when half of the prescribed treatment did not happen.

One thing this cannot do

This is an arithmetic tool, not medical advice. It works out numbers from what you type in — it does not know your medication, your prescription, or what you should do if something goes wrong. Anything about changing a dose, spacing doses differently, or handling a missed dose is a question for your doctor or pharmacist.