About

MACH RUN is The Supersonic Retirement Calculator. You type the household as it stands — family, accounts, paychecks, spending, contributions — then hit Calculate. The engine runs an OODA Loop: Observe, Orient, Decide, Act.

It was built by a retired U.S. Air Force fighter pilot who wanted one place to see income sources, investment contributions (all types), and a nest-egg goal on the same strip. The name is Measure, Allocate, Compound, Harvest — MACH. The method is Boyd’s OODA loop, used here as a way to look at money. OODA was first used to teach young fighter pilots how to excel at dogfighting.

Join for free, and poke around. Paid plans unlock the full ledger, Net Worth, encrypted backups, and OODA AI. None of it is financial, tax, legal, or investment advice. It is a planning sketch from the numbers you type. MACH RUN is not a financial advisor, we do not sell financial products of any kind -- it is a tool. Like a radar in fighter jet can help give situation awareness (SA) in an air battle, but cannot win the air battle for you, a retirement calculator can help build your SA on your financial position, increasing your chances of achieving your financial goals.

You are solely responsible for your financial decisions.

Questions, a bug, or a feature you want on the site? Contact Us.

Would you like to see what features were recently implemented on MACH RUN? Swing over to Features.