$100 in 1974 is worth $642.38 today $100 in 1975 → 2024 $100 in 1970 → 2024 Inflation rate in 2024 Future inflation calculator The U.S. dollar has lost 84% its value since 1974 Updated: December 12, 2023 $100 in 1974 is equivalent in purchasing power to about $642.38 today, an increase of $542.38 over 50 years.