PharmacyCalcs – Master Pharmacy Calculations
Trusted for GPHC PEBC NAPLEX PTCB OSCEs Pharmacy EE
Built for pharmacy students & candidates

Master pharmacy calculations before exam day

Hundreds of hand-crafted MCQ questions across every calculation topic tested on the GPHC, PEBC, NAPLEX, and PTCB. Study at your own pace — and pass with confidence.

500+ practice questions
12+ topic areas covered
~$1 per day to study
Sample question — Dosage calculations GPHC · PEBC

A patient weighing 70 kg requires amoxicillin at 25 mg/kg/day in three divided doses. The suspension available is 250 mg/5 mL. What volume is needed per dose?

A.   3.3 mL
B.   7.0 mL
C.   9.3 mL
D.   11.7 mL

Every topic that shows
up on your exam

Our MCQ library covers every major calculation category — from basic dosing to advanced pharmacokinetics.

Doses and dose regimens
Dosage & unit conversions (mg → mL, etc.)
Kidney function (Cockcroft-Gault)
Displacement volumes (antibiotic reconstitution)
Concentrations (% w/v, % v/v)
Dilutions (C₁V₁ = C₂V₂)
Molecular weight calculations
Formulae: BSA, BMI, IBW
Infusion rates (IV calculations)
Pharmacokinetics (half-life, loading dose)
Health economics (NNT, cost-benefit)
Quantities to supply / days supply
💊
Dosage
Weight-based & standard dose calculations
💧
IV & Infusions
Flow rates, drip calculations
⚗️
Concentrations
% w/v, dilutions, alligation
🧪
Pharmacokinetics
Half-life, Vd, clearance
🫘
Renal Function
CrCl, GFR, dose adjustment
📊
Health Economics
NNT, NNH, cost-effectiveness

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    Students who passed with PharmacyCalcs

    ★★★★★

    "The calculations section of the GPHC exam was the part I was most worried about. After working through the question bank here I felt genuinely prepared. The step-by-step explanations are what made the difference."

    SR
    Simran R.
    GPHC OSCEs — passed 2024
    ★★★★★

    "As an internationally trained pharmacist preparing for the PEBC, I needed something focused on calculations specifically. This is the only resource I found that does exactly that. 100% recommend."

    MO
    Marcus O.
    PEBC EE — passed 2025
    ★★★★★

    "I tried YouTube, textbooks, everything. PharmacyCalcs is the only thing that made calculations click. Being able to do 5 quizzes in a row late at night at my own pace was key for me."

    AL
    Aisha L.
    Pharmacy student, Year 4

    Common questions

    PharmacyCalcs is designed for anyone sitting a pharmacy calculations exam — including pharmacy students preparing for assessments, internationally trained pharmacists taking equivalency exams (PEBC EE, GPHC OSCEs), and candidates sitting the NAPLEX or PTCB. If pharmacy calculations are on your exam, this is for you.
    After completing your purchase you will receive an email with your login credentials. Simply log in at pharmacycalcs.com and your full question bank will be immediately available. Access is instant — no waiting.
    The question bank contains hundreds of hand-crafted questions across all 12+ topic areas. New questions are added regularly. Each question comes with a detailed worked explanation so you understand exactly how to reach the correct answer.
    Our questions are relevant to the GPHC (UK), PEBC EE (Canada), NAPLEX & PTCB (USA), and general pharmacy programme assessments. The calculation topics covered are consistent across all major pharmacy licensing exams worldwide.
    Yes! You can try a free demo with no account required at pharmacycalcs.com/try-our-demo. This gives you a feel for the question format and explanation style before you commit to a subscription.
    All plans are one-time payments (not recurring subscriptions), so there is nothing to cancel. If you have an issue with your purchase, contact us via the Contact page and we will do our best to resolve it.
    Absolutely. PharmacyCalcs works on any device — phone, tablet, or desktop. Many students do a few quizzes on their phone during commutes. No app download needed.

    Ready to stop guessing and start passing?

    Join thousands of pharmacy students and candidates who have used PharmacyCalcs to master the maths behind the medicine.