Tools

Seven calculators. Numbers in, numbers out.

Each one is wired to the matching topic page. The point is that the math you read about has a place to land: your own income, your own balance, your own life.

Compound Interest

Model contributions, rate, and time. See growth split from contribution.

Loan Amortization

Monthly payment, full schedule, interest saved by paying extra.

Tax Brackets (US 2025)

Bracket-by-bracket breakdown of federal tax owed on a salary.

Net Worth Tracker

Track assets and liabilities locally. Nothing leaves your browser.

Financial Independence

Turn a savings rate into a number and a date. See the year work becomes optional.

Debt Payoff Planner

List every debt, pick snowball or avalanche, and see the payoff date and total interest.

Rent vs Buy

Compare buying and renting as net worth over time, with the year buying pulls ahead.

Savings Goal Planner

Name a goal, set a monthly amount, and see the month you hit it, with interest counted.