Blog — Articles & Deep Dives

Not generic financial advice — just the math, the code, and the logic behind each calculator. From compound interest formulas to tax bracket data structures, this is where I document how the tools actually work.

Finance Calculations: Formulas, Methods & Tax Rules Explained → The Rule of 72 - A Simple Way to Estimate Doubling Time → Finance Excel Templates: Free Download for Budgeting, Investing & More → Tax Amortization Benefit: What It Is and How It Works →

Every calculator on this site is built 100% client-side — your numbers never leave your browser. This blog exists to show the exact formulas, data sources, and JavaScript logic behind each tool, so you can verify the numbers yourself rather than trusting a black box.

Posts cover the mathematical derivation of compound interest, how the Kelly Criterion is implemented, the IRS tax tables we hardcode each year, and the sorting algorithms behind debt snowball vs. avalanche. No fluff — just the mechanics.

If you're a developer or a numbers-minded user, you'll find the exact code patterns and assumptions documented here. If you're looking for personalised financial advice, this isn't the place — but you'll understand exactly what the calculators are doing with your inputs.