Guides
Short, practical explainers that pair with our calculators.
How to pay off your mortgage faster
Five practical ways to cut years and thousands in interest from a mortgage - with the maths behind each.
Tipping around the world: a quick guide
How much to tip in North America, Europe, Asia and elsewhere - and when not to tip at all.
Compound interest explained simply
What compound interest is, why starting early matters, the rule of 72, and how fees and inflation change the picture.
Percentages made easy: mental maths tricks
Quick ways to work out 10%, 15%, 20%, sale prices and percentage change in your head.