Good Vs Bad Debt Calculator

People talk about debt as if it were a single thing — and as if the only virtuous move were to avoid all of it. But two people can take the exact same loan, with the same amount, rate, and term, and end up in completely different places. The difference has nothing to do with the loan and everything to do with what the borrowed money bought. Borrow to buy something that grows in value — a home, an education that lifts your earning power, a business — and the asset can outpace the interest, so the debt quietly pays for itself: that's good debt, leverage working in your favor. Borrow to buy something that loses value — a car, a vacation, everyday consumption on a credit card — and you lose twice: you pay interest on the loan AND watch the thing shrink, often so fast that for years you owe more than it's worth. That last bit has a name people know from car loans: being underwater, or upside down. This lesson makes the split visual. Two borrowers take the identical loan; one buys an appreciating asset, the other a depreciating one. The simulator races each borrower's net worth — the asset's value minus the loan still owed — over the life of the loan. Both start at exactly zero. The good-debt line climbs steadily into the black; the bad-debt line dives below zero into the shaded underwater zone before clawing its way back. The unifying rule is the same crossover that governs the pay-down-or-invest question: the loan's interest rate is the hurdle. An asset growing faster than the rate makes borrowing worthwhile; an asset growing slower — or shrinking — means the leverage is working against you. Good debt isn't a category of loan you can spot by its name. It's any borrowing where the thing you bought out-earns the cost of the money.

Free and interactive — no sign-up, nothing to install. Read the full lesson for the plain-language explanation.