Guides
Plain-English explanations of the math behind your money decisions — each guide has the relevant calculator built right in, so you can read and try it in the same place.
How to Calculate Mortgage Payments (Step by Step)
The exact formula lenders use for your monthly payment, worked through with real numbers.
What Is Your FIRE Number? A Beginner's Guide
What a FIRE number actually means, how the 4% rule works, and how to calculate yours.
Debt Snowball vs. Avalanche: Which Pays Off Debt Faster?
The math behind both debt payoff methods, and which one actually saves you more money.