Guides

Guides & explainers

Short, practical reads that go a level deeper than the calculators, on money, health, school, and everyday numbers.

• How much house can I afford?

  The 28/36 rule, debt-to-income, down payments, and the real monthly cost of owning a home.

• Compound interest explained

  How money grows itself, why time beats the rate, and how to put the snowball to work.

• How to calculate your GPA

  The 4.0 scale, how credits weight your grades, weighted vs unweighted, and what counts as good.

• Understanding BMI

  What body mass index measures, the categories, and the important things it leaves out.

• How to tip by country

  What's expected in the US, Europe, Japan, and beyond, and where tipping is optional.