Get every mark you deserve in calculations

Step-by-step methods for doses, dilutions, infusions and more, built for GPhC exam accuracy. Master the formulas and techniques that matter most.

Exam Structure
40 Questions
120 minutes | 3 minutes per question
Calculator and numerical entry format
Unit Conversions
1 kg = 1000 grams
1 gram = 1000 milligrams
1 milligram = 1000 micrograms
Rounding Rules
Give your answer to the nearest 0.05 mL
Round up to the nearest 15 mg
Give your answer to one decimal place
Key Formulas
M = 1 mole of solute in 1L (1000ml)
1 kg = 2.2 lb
10% w/w: 10g solute in 100g

How PharmX Makes Calculations Click

Calculate required dose
25mg × 4.2 = 105mg
Reconstitution Volume
6mL + 0.3mL = 6.3mL
So, 300mg in 6.3 mL
300mg → 6.3 mL
105mg → X
(105 × 6.3) / 300
= 2.205 mL
= 2.2 mL
to one decimal place

Extensive Practice

Work through hundreds of calculations step-by-step with immediate feedback.

4.5333 ÷ 10 = 0.4533 mL/min = 0.5 mL/min

Conversion Excellence

Master rounding and unit conversions with step-by-step guidance.

Correct

Instant Validation

Get immediate confirmation with detailed explanations for every answer.

What's Covered

🧪

Concentrations

💧

Dilutions

⚖️

Displacement Volumes

💊

Dose and Dosage Regimens

💉

Infusion Rates

📊

Medical Statistics

💰

Pharmacoeconomics

⏱️

Pharmacokinetics

📦

Quantities to Supply

Practice Questions

Test your knowledge

Question 1 of 10

Mr. T visits your health clinic for a wellness check-up. He currently weighs 95 kg and has a height of 175 cm. His goal is to reduce his BMI to 22.5 by following a structured diet and exercise plan.

How much weight, in kilograms, does Mr. T need to lose to achieve his target BMI? Provide your answer to one decimal place.

kg

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