Guides
Calculation guides
Each guide explains one family of calculations from the start: the idea, the formulas and their units, worked examples, the mistakes students make, and practice questions with full working. Then it points you to the calculator that does the arithmetic.
Pharmaceutical Chemistry & Compounding · 21 min read
Dilution and Concentration Calculations
Molarity, mg/mL, % w/v, ratio strength and ppm explained, with C₁V₁ = C₂V₂, serial dilutions, alligation and stock solutions worked step by step.
8 practice questions · 4 linked calculators
Read the guidePharmaceutical Calculations · 17 min read
Pharmaceutical Dose Calculations: Units, Body Weight and Body Surface Area
Work dose calculations step by step: metric units, dimensional analysis, mg/kg and mg/m² dosing, volume to give, IV infusion and drip rates.
7 practice questions · 3 linked calculators
Read the guidePharmaceutics · 20 min read
Zero-, First- and Second-Order Kinetics in Drug Stability
How drugs degrade by zero-, first- and second-order kinetics, how to find the order from data, and how k, t½, t90 and the Arrhenius equation are used.
8 practice questions · 3 linked calculators
Read the guidePharmaceutical Analysis · 17 min read
Accuracy, Precision and Percentage Recovery in Pharmaceutical Analysis
Accuracy vs precision, % recovery, mean, SD and %RSD, calibration curves and % label claim, with worked examples and practice questions.
7 practice questions · 4 linked calculators
Read the guideBiopharmaceutics & Pharmacokinetics · 16 min read
Pharmacokinetic Parameters: AUC, Clearance, Half-Life and Bioavailability
Work out kₑ, half-life, volume of distribution, AUC, clearance and bioavailability from concentration–time data, with a full worked IV-bolus example.
8 practice questions · 4 linked calculators
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