A five-minute money interview
What one dollar invested at 25 can become by 65 at a 9% average annual return. The interview takes your numbers and shows your version of this math.
Educational tool built on commonly-taught personal-finance principles. Nothing here is financial advice; numbers stay in your browser and are never sent anywhere.
Your interview verdict
The money ladder
Work the rungs in order. Each one earns more (or saves more) than the one below it — skipping ahead means leaving guaranteed returns on the table.
The scoreboard
Two people on the same salary can be a decade apart in wealth — because the scoreboard only counts what you keep. Type two rough numbers; nothing is stored.
The only number worth tracking monthly. Salary never appears on this scoreboard — only what stuck around.
Chart 01 · Compounding
Drag the sliders. The gap between the two lines is growth you never had to earn at a job — that's the entire case for starting now.
Chart 02 · The cost of waiting
Chart 03 · Your dollar multiplier
Every dollar you invest carries a multiplier stamped with your age. It shrinks every birthday — which is why the young have a superpower and don't know it.
Toolkit · Sinking funds
Holidays, insurance premiums, brake pads — none of these are emergencies; they're appointments. A sinking fund pays a known future bill in small monthly slices so it never touches a credit card.
Name a savings bucket after the bill, automate the slice, and December (or the mechanic) stops being a financial event.
Toolkit · Small leaks
Daily on-the-go spending isn't evil; it's just rarely a decision. This is what one small recurring habit is quietly worth, so you can decide on purpose — keep it, trim it, or trade it.
Chart 04 · Debt vs. invest
Net position over 10 years: investments minus remaining debt. Investing assumed at 9%/yr; the debt compounds at the APR you set. The avalanche wins because no index fund reliably beats a credit-card interest rate.
Chart 05 · Fee drag
Two identical portfolios, identical returns — the only difference is the fund's expense ratio. Fees compound exactly like returns do, just against you. This is the whole argument for low-cost index funds.
Chart 06 · Lifestyle creep
Two versions of you get the same ~3% raise every year. One lets spending rise to meet it; the other quietly invests a slice of every raise. Same job, same luck — very different endings.
Chart 07 · Roth vs. traditional
Roth means taxed now, never again; traditional means deducted now, taxed on the way out. The whole decision collapses to one question: is your tax rate higher today or in retirement?
Chart 08 · Savings rate
The math behind work-optional life: save more of what you earn and two things happen at once — your portfolio grows faster and the life it must fund gets cheaper. Years to financial independence, assuming 5% real returns and the 4% withdrawal guideline.
Field notes
The math is the easy part. These are the behaviors that make it actually happen.