Old money in today's dollars. Find out what an amount of money from any year is worth today, using official consumer price index data built in: US CPI-U back to 1913, UK CPI and the long-run RPI back to 1800, Canada CPI back to 1914 and the euro area HICP back to 1996.
https://plugins-worker.demos.42a.ai/inflation-calculator/mcpSettings → Security and login → Developer mode → chatgpt.com/plugins → + → paste the URL. After a tool change: Refresh, then a new chat.
| Prompt | Tool | Expected |
|---|---|---|
| What is $100 in 1990 worth today? | adjust_for_inflation | $256.30 in August 2026 dollars (CPI-U 130.7 to 334.980), +156.3% cumulative. |
| How much would a $50,000 salary in 2000 be in 2025 dollars? | adjust_for_inflation | $93,479.38 using the 2000 and 2025 annual averages (172.2 to 321.943), +87.0%. |
| How much did prices rise from January 2020 to January 2026? What does $1,000 then equal now? | adjust_for_inflation | $1,000 in January 2020 equals $1,260.81 in January 2026 (257.971 to 325.252): +26.08%. |
| What is £100 from 1970 worth now in the UK? | adjust_for_inflation | Uses the long-run RPI (CPI starts 1988): £2,275.24 in August 2026 (73.1 to 1,663.2). |
| Canada: what is $20 from 1980 worth in 2026? | adjust_for_inflation | 2026 is partial, so August 2026 (169.8) is used and the card says so: C$77.18 (1980 average 44.0). |
| How much will $10,000 be worth in 20 years if I invest it at 7%? | none | A future investment projection, not historical inflation. |
| Convert 100 US dollars to euros. | none | Currency conversion, not inflation. |
| Why is inflation so high right now? | none | An economics explanation, no amount to adjust. |