The Tools

Calculators.

Interactive tools for the long-game investor — each built around a single financial question. Honest, fast, and always free.

The Compound Engine

Investment Calculator

Model compounding returns across any time horizon. Adjust starting capital, monthly contribution, years, and expected return — see what discipline buys you.

The Table Round

Bill Split Calculator

Punch in three numbers from the receipt — subtotal, total, and what your items cost — and find out exactly what you owe with tax and tip split proportionally.