Reckon

Ledger No. 20

Twenty quick tools for everyday money math — no sign-up, figures shown as you type.

Money math, explained

Short, practical reads — each one paired with the calculator that puts it into practice.

Why Minimum Payments Keep You in Debt Longer Than You Think

Minimum payments shrink as your balance drops — which sounds helpful, but it's exactly why they stretch payoff time and interest cost so much further than people expect.

The Real Cost of Only Paying Interest on a Loan

Interest-only payments feel lighter month to month, but the principal never moves. Here's what that actually costs over the life of a loan.

Debt Snowball vs. Avalanche: Which Actually Saves More

One method is built for motivation, the other for math. Here's the real trade-off between the two most common debt payoff strategies.

Stacked Discounts: Why 30% + 10% Isn't 40% Off

Sales that stack a second discount on top of the first don't add up the way it feels like they should. Here's the math retailers are actually using.

Unit Pricing Tricks Stores Use (and How to Spot Them)

Bigger packaging isn't always the better deal. A look at how package sizing quietly works against quick price comparisons — and how to see through it.

The 4% Rule, Explained (and Its Limits)

A widely cited retirement withdrawal guideline — where it comes from, what it assumes, and why it's a starting point rather than a guarantee.

Compound Interest: The Math That Makes Early Saving Powerful

Why the same monthly amount, started a few years earlier, can end up worth dramatically more — and the mechanics behind why time matters more than timing.