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Learn money by doing.

13 interactive tools. Every concept from the book, made interactive. Scanning a QR from the book? Your simulator is already open below.

CH. 6INVESTING

Compound Interest

Watch your money grow with different rates, time horizons, and monthly contributions.

Open Chapter 6
CH. 3BUDGETING

50/30/20 Budget Planner

Build a working budget in two minutes — needs, wants, and savings, in real numbers.

Open Chapter 3
CH. 22INVESTING

Rule of 72

How long does it take your money to double? The fastest mental-maths trick in finance.

Open Chapter 22
CH. 22PLANNING

FIRE Number

How much do you need invested to never have to work again? Calculate your number.

Open Chapter 22
CH. 8INVESTING

Stock vs. ETF

Run 100 simulations of stock-picking vs. an index fund and watch what wins.

Open Chapter 8
CH. 9INVESTING

Risk Tolerance Quiz

10 questions to find out what kind of investor you actually are.

Open Chapter 9
CH. 22BUDGETING

Emergency Fund

Your emergency fund IS your first investment. Calculate yours.

Open Chapter 22
CH. 18TAX

Teen Tax Calculator

See exactly what you owe — and what you can probably get back.

Open Chapter 18
CH. 15PSYCHOLOGY

Cognitive Bias Quiz

Find the brain biases quietly draining your bank account.

Open Chapter 15
CH. 10INVESTING

Time in Market

Why missing the 10 best days of the market can wreck a 30-year plan.

Open Chapter 10
CH. 22INVESTING

Asset Allocation (Rule of 110)

A simple rule for splitting your portfolio between stocks and bonds, by age.

Open Chapter 22
CH. 17DEBT

Debt Analyzer

Tell good debt from bad — and see what extra payments really save you.

Open Chapter 17
CH. 25PLANNING

Life Milestone Planner

Your personal financial roadmap from 18 → 30. Priorities, mistakes, checklists.

Open Chapter 25