Every number sourced

The math behind it,
step by step.

Plain-English investing education for people with money at stake. Index funds, retirement accounts, fees, and compound interest — explained with real, verified numbers.

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Index Investing

Index funds, ETFs, compound interest, dollar-cost averaging.

Retirement Accounts

401(k)s, IRAs, employer matches, rollovers.

Fees & Costs

Expense ratios, fee drag, what brokers charge.

Latest articles

How to Invest Your First $1,000 in Index Funds (Step by Step)

A plain-English, step-by-step guide to investing your first $1,000 in index funds — with the real numbers on fees, returns, and what to expect.

August 17, 2026

Free tools

Compound Interest Calculator

See how your money grows with monthly contributions — future value, contributions, and growth.

Fee Drag Calculator

How a small expense-ratio difference costs you tens of thousands over time.

401(k) Match Calculator

How much "free money" is your employer match worth — and what you leave behind.

Retirement Goal Calculator

How much to save each month to reach your retirement number.

Index Fund vs ETF

Which fits your starting amount — minimums, fees, and taxes side by side.

Roth vs Traditional IRA

Which account wins based on your tax rate now vs in retirement.

The math behind it,step by step.