Dosage math, drilled until it's automatic.
Dosage calculations are free marks on the REx-PN — if the method is in your fingers, not just your notes. This trainer generates a brand-new question every time you tap, across all 8 calculation categories, and walks you through the full solution step by step.
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A real question from the trainer
Order: infuse 250 mL of 0.9% NaCl IV over 6 hours. The tubing drop factor is 20 gtt/mL. Calculate the drip rate in gtt/min.
Solution, step by step:
gtt/min = [Volume × Drop factor] ÷ Time (min) = (250 × 20) ÷ 360 = 13.89 → 14 gtt/min (you can't count part of a drop).
Every question in the trainer is generated fresh and graded instantly, with the worked solution shown either way — right or wrong, you learn the method.
Sound familiar?
Most candidates don't fail dosage math because it's hard. They fail it because they practised ten questions and the exam asked the eleventh.
You memorized the worked examples in your textbook — then the exam changed the numbers, the units, or both, and the method fell apart.
"Give 2 Tbsp" — wait, is that 30 mL? Household measures (tsp, Tbsp, fl oz, cups) show up in real orders and on the exam, and they're the easiest points to lose.
gtt/min, mL/hr, mg/kg, U-100 insulin: four formulas that look alike under pressure and punish a single slipped decimal.
A workbook ends. Once you've seen every question in it, you're memorizing answers, not building skill.
What's inside
Eight categories, three levels, one formulas panel — every question generated on the spot, so the practice never runs out and never repeats verbatim.
Category 1 — Oral Tablets
(Desired ÷ Have) × Quantity — including scored half-tablets and gram-to-mg orders.
Category 2 — Liquid Dosing
Suspensions and elixirs: turn an mg order into the mL you actually measure.
Category 3 — Household Measures
tsp, Tbsp, fl oz and cups ↔ mL — plus two-step questions that combine a bottle strength with a kitchen measure.
Category 4 — IV Flow Rate
Set the pump: volume ÷ time in mL/hr, including minutes-to-hours conversions.
Category 5 — IV Drip Rate
gtt/min with 10, 15, 20 and 60 gtt/mL tubing — rounded the way you count drops.
Category 6 — Weight-Based Dosing
mg/kg for adults and children, with lb → kg conversion built in.
Category 7 — Insulin (U-100)
Units ↔ mL both directions, measured to the hundredth like a real insulin syringe.
Category 8 — Safe Range Check
The judgment question: is this ordered dose inside the safe range — or do you hold it and clarify?
3 levels — from single-step to judgment: Level 1 builds the formulas, Level 2 adds conversions, Level 3 mixes everything — and a formulas reference panel is always one tap away. Members: the trainer is included free in the member library for RPN Study Material buyers, RPN Success Bundle buyers and Full Access members — this page is for candidates who want the trainer on its own.
Why it works
Skill comes from reps with feedback — not from re-reading the same ten examples.
🎲 Unlimited Reps
Every question is generated fresh — new drug, new numbers, new units. You can't memorize your way through it, so the method itself is what sticks.
🪜 Solutions That Teach
Right or wrong, you see the complete worked solution: the formula, the substitution, and the rounding rule — the same way you'd show your work on the exam.
🍁 Built for the REx-PN
The categories, units and conversions match the dosage content REx-PN candidates face in Ontario and British Columbia — household measures included, because they really are tested.
Hi, I am Gabrielle Campagnoli, RPN
I passed the REx-PN and now work in long-term care in Ontario, where dosage math is a daily skill — insulin, elixirs, IV rates, and the teaspoon conversions families use at home. I built the trainer I wished I'd had: endless questions, honest feedback, and the steps shown every single time.
Start drilling today
One-time payment · secure checkout via Stripe
- All 8 calculation categories
- Unlimited generated questions — never repeats verbatim
- 3 difficulty levels, from single-step to safe-range judgment
- Full step-by-step solution on every question
- Formulas reference panel always on hand
- Lives in your online library — phone, tablet or computer
- Yours to keep forever
Questions? Answered.
How do I receive the trainer?
After checkout you'll be taken straight to your personal online library, and your delivery email (with your library link and personal access code) arrives right after payment. The trainer lives inside the library — open it and practise on any device, no downloads or installs.
Who is this trainer for?
REx-PN candidates in Ontario (RPN) and British Columbia (LPN), and practical-nursing students who want their dosage calculations fast and reliable. The categories cover the calculation types the exam draws on, including household measures.
Is it included in your other products?
Yes — the trainer is included free in the member library if you have the RPN Study Material, the RPN Success Bundle, or any Full Access plan. Buy it here only if you want the trainer on its own.
Do the questions repeat?
Questions are generated with new numbers every time, so a question can come back with different values — that's the point. You learn the method, not a memorized answer key.
How long do I have access?
Forever. The trainer is yours to keep in your library — no subscription, no expiry.
Is this a clinical reference?
No — it's a practice tool for exam preparation. Always follow your employer's policies and verify real-world calculations per clinical standards.
On exam day, the numbers will be new.
Train with new numbers every day, and that stops being scary. A few minutes of drilling now is marks in the bank later.
Preparing for the full REx-PN? See all Your RPN Essentials resources →