Days Supply Of Medication Calculator

Work out days supply of medication instantly with clear inputs, formula shown and shareable results.

About Days Supply Of Medication Calculator

Divides the dispensed quantity by the daily consumption to give the days supply used for refill timing and insurance claims.

Formula

Days supply

Days supply = quantity dispensed / (units per dose x doses per day)

Worked example

With the default values below, Days Supply Of Medication Calculator returns Days supply of 30.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Quantity dispensedaccepts 1–1,000: 60
Units per doseaccepts 0.25–10: 1
Doses per dayaccepts 1–8: 2

Results

Days supply: 30.0 days
Units used per day: 2.00
Complete days covered: 30 days

Step by step

1Values used
2Days supply
3Days supply= 30.0 days
4Units used per day= 2.00
5Complete days covered= 30 days

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why does days supply matter to insurers?

Refills claimed before the previous supply runs out are rejected as too soon to fill.

How are as-needed medicines handled?

The maximum daily dose from the directions is normally used, which understates the true duration.