Oral Drug Dosage Calculator - Tablets Capsules and Pills

Medicine Dosage Equations Formulas

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This calculator determines the number of tablets or fraction of a tablet to be administered to the patient. The medicine bottle label states the mass of medicine contained in each capsule. The mass is the have dose.

  1. Quantity is one (1) for tablets and capsules.
  2. Note: P.O. (Latin for per os) stands for by mouth or orally.

Calculation Instructions:

  1. Enter the desired dose and select the units.
  2. Enter the have dose and select the units.


Parameter Unit Units Used Description
D(desired) dose mass milligram gram microgram This is the prescribed dose or ordered dose.
H(have) dose mass milligram gram microgram This is the available dose or stock dose.


Parameter Unit Units Used Description
X(amount) Unitless Not applicable The amount or number of tablets, capsules or pills to administer.


Software programs, calculations, solutions, answers and calculators are intended for education purposes only. Use at your own risk. With the use of any information on this site, the user shall assume/take sole responsibility for any consequences or damages. This calculator may or may not be accurate or reliable. By using this calculator you acknowledge any reliance on this calculator shall be at your sole risk.

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