Health & fitness · Medication math
Pill splitting calculator.
Enter the dose in mg and the tablet strength to get tablets per dose, per day and for a number of days, and whether it is a whole, half or part tablet.
Not medical advice
This tool only does arithmetic on numbers you type in from your own prescription or package label. It does not recommend any drug, dose or schedule. Follow your prescriber, pharmacist and the label, and ask them before changing how you take any medicine.
Inputs
Tablets
Enter the numbers above.
How tablets per dose are worked out
Tablets per dose is the dose divided by the tablet strength. A result of 1 is a whole tablet, 0.5 is a half and 1.5 is a whole plus a half. Multiply by doses per day, then by days, for the supply, and round the bottle count up to whole tablets.
Worked example. A dose of 37.5 mg with 25 mg tablets is 37.5 / 25 = 1.5 tablets. Twice a day is 3 tablets a day, and 30 days is 90 tablets. A half of a 25 mg tablet is 12.5 mg. The other direction works too: 3 tablets of 25 mg is 75 mg.
Whether a particular tablet is safe to split is not something arithmetic can tell you. It depends on how the tablet is made, for example whether it is scored, coated or slow-release. Ask your pharmacist before splitting, and use the strength they dispense. A different tablet strength can often avoid splitting; the pharmacist can say if that is possible.
Frequently asked questions
How many tablets is a dose?
Divide the dose in mg by the tablet strength in mg. A 37.5 mg dose with 25 mg tablets is 1.5 tablets.
Can I split any tablet in half?
Not necessarily. Whether a tablet can be split depends on how it is made, so ask your pharmacist before splitting. This tool only does the division.
How many tablets do I need for 30 days?
Multiply tablets per dose by doses per day by 30, then round up. At 1.5 tablets twice a day that is 90 tablets.
What does the part-tablet flag mean?
It means the dose is not a whole, half or quarter tablet, so it is hard to measure with a tablet. Ask your pharmacist about another strength.
Sources
Checked
Arithmetic only. Splitting suitability is not assessed. Runs entirely in your browser. Nothing you type is sent or stored.
Scope
Splitting suitability is a pharmacist question, not an arithmetic one. This is a calculation aid, not medical or pharmacy advice, and it does not know your medicine, your health or your prescription. Your label, prescriber and pharmacist decide.