USD Purchasing Power in Real Time Since 2000

What it shows

A minimalist web tool is putting a small, uncomfortable number on your screen: the real purchasing power of one US dollar, measured from January 2000 and updated in real time. The readout ticks downward like a slow leak—no drama, just math—tracking how much less a lone dollar buys as inflation does its quiet work. It’s simple and brutal. How many cups of coffee does one dollar still cover? Not many.

Data and method

The site uses official data: Bureau of Labor Statistics CPI-U, All Items, US City Average, Not Seasonally Adjusted (series CUUR0000SA0). Allegedly the displayed value is interpolated from the two most recent monthly CPI readings and extended to the present moment at the observed rate of change; the real-time tick subdivides that monthly rate into per-second increments so the figure moves continuously. It has been reported that the project surfaced on Hacker News, where readers flagged the emotional punch of watching dollars visibly erode.

Why it matters

Numbers on a page can be abstract. A ticking dollar is not. Seeing purchasing power slide in real time turns a macroeconomic trend into a personal, almost tactile experience—frustration, alarm, resignation. It’s a reminder that inflation isn’t just a headline; it’s money shrinking in your pocket. For policy wonks and everyday spenders alike, the site offers a quick, arresting way to feel the passage of purchasing power.

Limits and context

This is an estimate, not a transaction log. Because it interpolates between monthly CPI readings, the per-second value is a smoothed projection rather than a perfectly timed measurement of market prices. Still, as a cultural artifact it nails the point: inflation accumulates, slowly but relentlessly. Watch it for a minute and you’ll get it—no graphs required.

Sources: onedollar.today, Hacker News