What $100 From 2000 Actually Buys Today
Meet Carla. In 2000 she tucked a crisp $100 bill into a birthday card and forgot about it. She found it in a drawer this year, still $100, and figured a hundred bucks is a hundred bucks. The Consumer Price Index says otherwise. To buy in 2025 what $100 bought in 2000, she'd need about $185. Her bill didn't shrink — the world around it got 85% more expensive. That gap is inflation, and the CPI is how it's measured.
Here's the math they hope you never run. The Consumer Price Index (a number tracking the average price of a fixed basket of goods and services that a typical household buys) is published monthly by the Bureau of Labor Statistics. The index is set to roughly 100 for a base period and rises as prices climb. To compare two years, you divide one year's index by the other. If the CPI was about 172 in 2000 and roughly 319 in 2025, the ratio is 319 ÷ 172 = 1.85. Multiply Carla's $100 by 1.85 and you get $185 — the same purchasing power, just more dollars to buy it.
The reverse view is just as revealing. That same $100 from 2000, measured in what it can actually purchase today, is worth only about $54 in year-2000 buying power. Nearly half its real value quietly evaporated while it sat in a drawer. Nobody took the money. Prices simply walked away from it.
This is the part most people miss about inflation: it isn't a single dramatic event, it's a slow tax that nobody mails you a bill for. A coffee that cost $1.50 in 2000 might run $3.00 today. A movie ticket roughly doubled. Rent in many cities far more than that. Individually, each price hike feels like the store being greedy. Stacked together and averaged across the whole basket, they become a measurable rate — and the CPI is the instrument that catches it. The reason your paycheck has to keep climbing just to stay in place is hiding in this exact arithmetic.
Watch how the erosion stacks up over a few decades:
- $100 in 1990 needs about $245 to buy the same goods in 2025
- $100 in 2000 needs about $185
- $100 in 2010 needs about $147
- $100 in 2020 needs about $125 — five years moved it that far
Notice that last line. A 25% jump in just five years feels steep because the early 2020s saw inflation run hotter than the slow grind of the prior decade. The CPI captures that — it doesn't assume a flat rate, it reflects what prices actually did, year by year. Quick question: do you know what your own savings from a decade ago are really worth now? Enter any amount and two years above, and the calculator runs the exact index ratio so you can see the buying power, not just the dollar figure.