Pill Splitting Dose Calculator

Work out pill splitting dose instantly with clear inputs, formula shown and shareable results.

About Pill Splitting Dose Calculator

Divides the tablet strength by the number of pieces and works out how many pieces make up the prescribed dose.

Formula

Split tablet dose

Dose per piece = tablet strength / pieces; pieces per dose = prescribed dose / dose per piece

Worked example

With the default values below, Pill Splitting Dose Calculator returns Dose in each piece of 50.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Whole tablet strengthaccepts 0.1–2,000 mg: 100 mg
Pieces per tabletaccepts 2–4: 2
Prescribed doseaccepts 0.1–2,000 mg: 25 mg

Results

Dose in each piece: 50.000 mg
Pieces needed per dose: 0.50
Accuracy note: Halving a scored tablet is usually acceptable

Step by step

1Values used
2Split tablet dose
3Dose in each piece= 50.000 mg
4Pieces needed per dose= 0.50
5Accuracy note= Halving a scored tablet is usually acceptable

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 3 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

Which tablets must not be split?

Modified-release, enteric-coated, cytotoxic and film-coated tablets, and any unscored tablet.

How accurate is halving?

Even scored tablets show 10 to 20% variation between halves, which matters for narrow therapeutic index drugs.