About this test
Pharmacy calculations are woven throughout the PTCE: the 2026 content outline flags calculation-based knowledge in every domain, from days supply and dilutions in Order Entry to dose checks in Medications. Math questions are also where prepared candidates gain the most ground, because unlike recall questions, they're 100% learnable.
Every question in this practice test includes a complete worked solution, and each distractor is a real calculation mistake (inverted ratio, decimal shift, wrong conversion factor), so reviewing your errors teaches you exactly which step went wrong.
New to the material? Work through our 2026 PTCB study guide first.
What's in the question bank
| Topic | Questions in bank |
|---|---|
| Unit Conversions | 4 |
| Ratio Proportion | 4 |
| Percentage Strength | 4 |
| Dilutions Alligation | 4 |
| Days Supply | 3 |
| Dosage By Weight | 3 |
| Iv Drip Rates | 3 |
| Business Math | 3 |
Key concepts to know
The conversions you must own
1 kg = 2.2 lb, 1 tsp = 5 mL, 1 tbsp = 15 mL, 1 fl oz = 30 mL (household convention), 1 gr = 65 mg (pharmacy convention), 1 L = 1,000 mL. Most exam math errors are conversion errors, not arithmetic errors.
Ratio & proportion solves most problems
Set the known relationship on one side, the unknown on the other, cross-multiply, and sanity-check the units. If your answer's units don't match the question, you inverted something.
Alligation for mixing strengths
When mixing a higher and lower strength to hit a target concentration, alligation gives the parts of each: differences on the diagonal become the ratio. It turns an intimidating problem into subtraction.
Pharmacy Math Practice: FAQ
How much math is on the PTCB exam?
PTCB doesn't publish an exact count, but the 2026 content outline marks calculation-based knowledge areas in all four domains, with the heaviest concentration in Order Entry & Processing (22.5% of the exam). Expect roughly 10-15 questions with a calculation component.
Can I use a calculator on the PTCE?
Yes, an on-screen calculator is provided in the Pearson VUE testing software. You can't bring your own.
Official sources checked
This quiz's content and explanations are built from and cross-checked against primary sources. Verify current exam facts directly with PTCB.