U.S. inflation · 1918–1931
$100 in 1918 has the same buying power as
$101
in 1931
| Cumulative price change | 0.7% |
|---|---|
| Average inflation rate | 0.05% per year |
| Converted amount ($100 base) | $101 |
| Price difference ($100 base) | $0.66 |
| CPI in 1918 | 15.1 |
| CPI in 1931 | 15.2 |
| Inflation in 1918 | 17.97% |
| Inflation in 1931 | -8.98% |
| $100 in 1918 → 1931 | $101 |
| $100 in 1931 → 1918 | $99.34 |
Between 1918 and 1931, the Consumer Price Index went from 15.1 to 15.2. Cumulatively, prices increased 0.7%, which works out to an average of 0.05% per year. Put differently, a dollar in 1918 bought what $0.99 buys in 1931.
| Amount in 1918 | Value in 1931 |
|---|---|
| $1.00 | $1.01 |
| $5.00 | $5.03 |
| $10.00 | $10.07 |
| $20.00 | $20.13 |
| $50.00 | $50.33 |
| $100 | $101 |
| $500 | $503 |
| $1,000 | $1,007 |
| $5,000 | $5,033 |
| $10,000 | $10,066 |
| $100,000 | $100,662 |
| $1,000,000 | $1,006,623 |
The headline number is an average. Individual categories moved very differently over this period. Here is what $100 of 1918 spending costs in 1931, by category:
| Category | Avg. yearly inflation | $100 in 1918 → |
|---|---|---|
| All items (CPI-U) | 0.05% | $101 |
| Apparel | -1.65% | $80.59 |
| Food | -1.97% | $77.25 |
Not shown because the BLS began these indexes after 1918: core (all items less food & energy) (1957–), energy (1957–), housing (1967–), medical care (1935–), transportation (1935–), recreation (1993–), education & communication (1993–).
| Year | CPI | Inflation rate | $100 from 1918 |
|---|---|---|---|
| 1918 | 15.1 | 18.0% | $100 |
| 1919 | 17.3 | 14.6% | $115 |
| 1920 | 20 | 15.6% | $132 |
| 1921 | 17.9 | -10.5% | $119 |
| 1922 | 16.8 | -6.1% | $111 |
| 1923 | 17.1 | 1.8% | $113 |
| 1924 | 17.1 | 0.0% | $113 |
| 1925 | 17.5 | 2.3% | $116 |
| 1926 | 17.7 | 1.1% | $117 |
| 1927 | 17.4 | -1.7% | $115 |
| 1928 | 17.1 | -1.7% | $113 |
| 1929 | 17.1 | 0.0% | $113 |
| 1930 | 16.7 | -2.3% | $111 |
| 1931 | 15.2 | -9.0% | $101 |
MLA: “Inflation from 1918 to 1931: $100 is worth $101 today.” InflationCalculator.com, U.S. Bureau of Labor Statistics CPI-U data, https://inflationcalculator.com/inflation/1918-to-1931/
APA: InflationCalculator.com. Inflation from 1918 to 1931. Based on U.S. Bureau of Labor Statistics CPI-U data. Retrieved from https://inflationcalculator.com/inflation/1918-to-1931/
Source: U.S. Bureau of Labor Statistics, CPI-U annual averages (series CUUR0000SA0; category indexes listed on the data sources page). See how these numbers are calculated.