Guides
Clear, no-jargon explainers for the numbers that come up in everyday life — each one paired with a free calculator so you can put it into practice.
How to Calculate Percentage: 3 Easy Methods
The three percentage calculations that cover almost everything — plus a mental-maths shortcut you'll actually remember.
4 min readHow Compound Interest Works (With Examples)
Why money grows faster the longer you leave it — the one concept behind almost all long-term wealth.
5 min readHow Much House Can You Afford?
The lender's rule of thumb, the factors that really set your budget, and the costs people forget.
5 min readHow to Convert Marks to a Percentage
One formula turns marks into a percentage — plus how to handle several subjects and papers worth different amounts.
3 min readWhat Is a Good Debt-to-Income Ratio?
What your DTI actually measures, the bands lenders tend to use, and simple ways to bring it down.
4 min readHow to Calculate BMI and What It Means
The BMI formula, what the categories mean, and the honest limits of what a single number can tell you.
4 min readHow Much Should You Save for Retirement?
Rules of thumb worth knowing, why time beats amount, and how to turn a distant target into this month's saving.
5 min readMargin vs Markup Explained
Two words, same numbers, very different results — and why mixing them up quietly eats your profit.
4 min readHow to Pay Off Credit Card Debt Faster
Avalanche saves the most money; snowball keeps you motivated. Here's how each works and how to choose.
5 min readHow to Calculate Your Net Worth (and Why It Matters)
One number that captures your whole financial position — and why watching it move matters more than your salary.
4 min readUnderstanding Your Daily Calorie Needs (BMR & TDEE)
What BMR and TDEE actually mean, how activity changes the number, and why any estimate is a starting point.
4 min readHow to Calculate a Discount and Sale Price
The quick way to work out any sale price in your head — plus how stacked discounts and tax really add up.
3 min readHow to Calculate Your GPA
How grade points and credit hours combine into a GPA — and how to work out the grades you still need.
4 min readWhat Is the 4% Rule (Safe Withdrawal Rate)?
A simple rule for turning a nest egg into annual income — where it came from, and where it wobbles.
5 min readShould You Refinance Your Mortgage?
When refinancing actually pays off, how to find your break-even point, and the traps that erase the savings.
5 min read