Dose Frequency Schedule Calculator

Work out dose frequency schedule instantly with clear inputs, formula shown and shareable results.

About Dose Frequency Schedule Calculator

Turns a doses-per-day instruction into an interval and a clock schedule, either evenly across 24 hours or compressed into waking hours.

Formula

Dose interval

Interval = spread of hours / number of doses when dosing around the clock, or spread / (doses - 1) when fitting doses into waking hours

Worked example

With the default values below, Dose Frequency Schedule Calculator returns Interval between doses of 6.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Doses per dayaccepts 1–12: 4
First dose houraccepts 0–23 h: 8 h
Spread acrossone of The full 24 hours, Waking hours only (16 hours): The full 24 hours

Results

Interval between doses: 6.00 h
Suggested dose times: 08:00, 14:00, 20:00, 02:00
Doses in 24 hours: 4

Step by step

1Values used
2Dose interval
3Interval between doses= 6.00 h
4Suggested dose times= 08:00, 14:00, 20:00, 02:00
5Doses in 24 hours= 4

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

Does four times a day mean every six hours?

Strictly yes, but many medicines are prescribed four times daily within waking hours, which shortens the daytime gaps.

Which drugs need true round-the-clock dosing?

Those with short half-lives where trough concentrations matter, such as many antibiotics and antiepileptics.