The CalcNow Blog
Practical guides to the math behind everyday decisions — money, health, and the numbers in between. Every article pairs with a free calculator.
Back-to-School Math: Stacked Discounts, Sales Tax, and a Budget That Holds
How to work out what back-to-school shopping really costs — stacking sale discounts correctly, adding your province's sales tax, and setting a budget you can actually keep.
The True Cost of a Car Loan (and How to Shrink It)
Why the monthly payment is the least useful number on a car loan — total interest by term length, the negative-equity trap of 84-month loans, and four ways to pay less.
What Do I Need on My Final? How to Plan Exam Season with Math
How to calculate the exam score you need for your target grade, triage multiple finals by impact, and decide where studying actually pays off.
GPA Scales in Canada: Why a 3.9 Isn't Always a 3.9
Canadian universities use 4.0, 4.3, 9-point, and percentage scales — how the systems differ, how to convert between them, and what actually matters for grad school.
How to Calculate Percentage Increase (With Real Examples)
The percentage increase formula explained step by step — plus the classic mistakes people make with percentage change, reverse percentages, and percentage points.
How Mortgage Payments Actually Work in Canada
Term vs amortization, why early payments are mostly interest, and how prepayments cut years off a Canadian mortgage — explained in plain English.
Compound Interest: Why Starting Early Beats Investing More
How compounding actually works, the Rule of 72, and the math behind why a 25-year-old investing less ends up with more than a 35-year-old investing more.
What Your BMI Does — and Doesn't — Tell You
BMI is a useful screening tool with well-known blind spots. What the number means, where it fails, and which measurements to pair it with.
How Many Calories Do You Actually Need Per Day?
BMR, TDEE, and activity multipliers explained — how daily calorie targets are really calculated, and how to set a deficit that actually sticks.
GST, HST and PST Explained: Canada's Sales Taxes by Province
Why your receipt looks different in every province — how GST, HST, PST and QST work, current rates across Canada, and how to reverse-calculate tax from a total.