Tested formulas · visible assumptions

Tools

Lightweight calculators and planners with static explanations and tested logic.

Fare and Change Calculator

Calculate fare, cash tendered, change due, or underpayment from player-entered scenario values.

Track player-defined study topics and attempt results without an invented question bank.

Are the calculations accurate?

Every tool shows its formula and a last-verified date. Inputs run in your browser; nothing is sent to a server.

Does this work on mobile?

Yes. Tools are client-rendered and the layout collapses to a single column under 760px.