HQ gadgets

Calculators

These tools do example math in public. They do not know your tax bracket, your state’s rules, or your future. You can still learn the shape of the story.

Compound growth

Principal, annual rate, years, monthly add. Monthly compounding. Chart + year table.

Open compound calculator

Paycheck estimator

Gross pay in, labeled example tax and FICA percentages out. You can edit every rate.

Open paycheck estimator

Educational illustration only — not tax, investment, or legal advice.