Pharmacology Calculators: Doses, Infusions & Half-Life

Use these pharmacology calculators to work out tablet and liquid doses, infusion rates, drug half-life, and selected treatment-related measurements. The Tablet Dose, Liquid Dose, and Dosage Infusion calculators help with common medication calculations, while Carboplatin AUC Dose supports a specific chemotherapy dosing method. You can also estimate Dialysis Dose (Kt/V), corrected sodium in hyperglycemia, or free water deficit in hypernatremia.These tools are intended for healthcare professionals, students, and others checking clinical calculations. Always verify inputs, units, and results against the applicable prescribing information and clinical guidance before making treatment decisions.

Tablet Dose

Calculate how many tablets to give from the ordered dose and the strength of the tablets on hand. Enter both doses in mg and get the number of tablets per administration.

Dextrose Intravenous Target Concentration

Calculate the final dextrose concentration when mixing two IV solutions (e.g. D50 with D5 or free water). Enter the volume and strength of each solution to get the resulting mixture's volume and dextrose percentage.

Dialysis Dose (Kt/V)

Estimate hemodialysis adequacy with the second-generation Daugirdas Kt/V formula. Enter post-dialysis weight, ultrafiltration volume, and pre- and post-dialysis BUN to calculate the delivered dialysis dose.

Tirzepatide Dose

Convert a prescribed tirzepatide (or semaglutide) dose in mg into the volume in mL and units to draw on a U-100 insulin syringe. Enter your dose, vial concentration and syringe size to see the exact syringe marking, doses per vial and how long it lasts.

Antiscalant Dosing

Calculate antiscalant dosing for reverse osmosis (RO) systems. Enter the product, dosage in ppm, day tank concentration and volume, and feed flow to get the dosing pump rate in mL/min plus the weight and volume of chemical to add to the tank.

Dosage Infusion

Calculate the IV infusion rate in mL/hr from the dose ordered, infusion time, standard dose, and volume ordered. Supports mg, mcg, g, and other units for safe medication administration.

Children's Acetaminophen Dose

Estimate a weight-based acetaminophen dose for a child. Enter the child’s weight and age, then choose the product and check its strength against the label.

Liquid Dose

Calculate the liquid dose of a medicine from the ordered dosage, the standard dosage, and the standard dosage unit (mg/dL, mg/5dL, or mg/15dL). Enter the values and get the exact liquid volume to administer in one step.

Clinical Dehydration Scale

Estimate dehydration severity in children with the Clinical Dehydration Scale (Goldman scale). Rate general appearance, eyes, mucous membranes, and tears to get a score from 0 to 8 and a dehydration classification.

Corrected Sodium (Hyperglycemia)

Estimates corrected serum sodium in hyperglycemia using the Katz (1.6 mEq/L per 100 mg/dL) and Hillier (2.4 mEq/L) correction factors. Enter measured sodium and serum glucose to see both results.

Half-Life Time

Calculate the half-life (t½) of a medicine from its peak concentration, trough concentration, and the time between them. Useful for estimating drug elimination speed and choosing dosing intervals.

Free Water Deficit – Hypernatremia

This calculator estimates the free water deficit in patients with hypernatremia. Select the patient type and enter weight, current serum sodium, and target sodium to find how much free water is needed to correct the sodium level.

Carboplatin AUC Dose

Calculate the carboplatin dose with the Calvert formula. Enter gender, age, weight, serum creatinine and target AUC to estimate GFR (Cockcroft-Gault) and the dose in mg.

Drug Abuse Screening Test

Answer 20 yes/no questions to get a DAST-20 score that estimates your level of risk related to drug use, along with a recommended next step. It is a screening tool, not a diagnosis.

MME

Quickly add up a patient's total daily opioid dose in morphine milligram equivalents (MME/day) using CDC 2022 conversion factors. Enter up to 6 medications with strength, units per dose and doses per day to get the total plus per-medication breakdown and CDC threshold guidance.

Peptide Reconstitution

Calculate the solution volume and U-100 syringe mark for a prescribed peptide dose. Enter the peptide amount in the vial, water added, prescribed dose, and syringe size.

Steroid Conversion

Convert a dose between systemic corticosteroids (prednisone, dexamethasone, hydrocortisone and more). Enter a medication and dose to get the equivalent prednisone dose and the full conversion table with potency and half-life.