Inflation Before 1913: Why Those Figures Are Estimates
Calculators will happily tell you what $100 in 1870 is worth today. Almost none of them mention that no official price index existed until 1913.
The 1913 Line
The U.S. Bureau of Labor Statistics Consumer Price Index begins in 1913. Any inflation figure for an earlier year comes from a reconstructed historical series built by economic historians from surviving price records — not from official government statistics. Those reconstructions are genuinely useful, but they carry substantially more uncertainty, and most calculators do not tell you which side of the line you are on.
This matters more than it sounds. A large share of the questions people actually ask — what $100 in 1880 is worth, what a Civil War salary converts to, what an 1899 price means today — fall entirely on the estimated side.
If a calculator returns "$3,338.42" for an 1882 amount, the cents are decorative. The underlying index for that year is published as a whole number, which puts the real uncertainty in the region of a couple of percent — tens of dollars on that figure, not fractions of one.
Where Pre-1913 Numbers Actually Come From
The most widely used reconstruction is the Federal Reserve Bank of Minneapolis series, which splices together three separate academic indices and then joins them to modern BLS data:
| Period | Source series | What it actually measured |
|---|---|---|
| 1800–1851 | Index of Prices Paid by Vermont Farmers for Family Living | Household goods bought by farming families in one state |
| 1851–1890 | Consumer Price Index by Ethel D. Hoover | Reconstructed consumer prices from surviving retail and wholesale records |
| 1890–1912 | Cost of Living Index by Albert Rees | Cost of living for wage-earning households |
| 1913 onward | BLS Consumer Price Index (CPI, then CPI-U from 1978) | Official national statistic, systematically collected |
Read that first row again: for the first half of the nineteenth century, the standard US inflation series rests on what Vermont farming households paid for family goods. It is the best available evidence, and it was assembled carefully — but it is not a national consumer price index in the modern sense, and it was never intended to be one.
MeasuringWorth publishes an alternative extension of CPI-U backward in time. Their own documentation notes that their series is identical to the BLS series only from 1978 onward, with adjustments before that. Two credible sources can therefore give different pre-1913 answers, and neither is wrong.
Why Nineteenth-Century Inflation Looks So Different
The reconstructions all agree on the broad shape, and it does not resemble the twentieth century at all. The long-run nineteenth-century trend was roughly flat to falling, with sharp war-driven spikes.
- The Civil War spike. Prices rose 23.3% in 1863 and 27.0% in 1864, then drifted down for three decades afterwards.
- The long deflation. From the mid-1870s to the late 1890s prices fell steadily. The index in 1899 sits close to where it was around 1850.
- No persistent inflation. The idea that money loses value every year is a twentieth-century phenomenon, tied to the end of the gold standard and modern monetary policy. For most of the nineteenth century it simply was not true.
A practical consequence: conversions from the 1850s, 1880s and 1890s land in a similar range, because very little net inflation happened between them. Conversions spanning 1863–64 or the 1910s behave completely differently.
Convert 1899 dollars to today's money, with the estimate caveat shown on the page.
Open the 1899 pageHow to Read a Pre-1913 Conversion
- Treat the result as an order-of-magnitude estimate, not a precise figure.
- Round aggressively — 'roughly $3,300' is honest; '$3,338.42' is not.
- Expect different sources to disagree by a few percent, and sometimes more.
- Check whether the calculator even discloses that the year predates official data. Most do not.
- For anything consequential — legal, academic or published work — cite the underlying series directly rather than a calculator.
None of this means pre-1913 conversions are useless. For understanding what a wage, a price or a fortune meant in its own time, they are the best tool available and the broad picture they give is sound. The problem is only ever false precision.
Every pre-1913 page on this site carries a visible notice, names the source series, and explains that the figure is reconstructed. For the method used on modern years, see how inflation adjustment works, and for the full period breakdown see US inflation by decade.
Pre-1913 values used on this site are taken from the Federal Reserve Bank of Minneapolis "Consumer Price Index, 1800–" table and rebased from its 1967=100 base to the 1982–84=100 base used for modern years, via the 1967 anchor. The rebasing was validated by converting the Fed's post-1913 years and comparing them against the BLS series: 18 checkpoints from 1913 to 2024 agreed to within 0.41%. That validation applies to the rebasing arithmetic only — it says nothing about the accuracy of the underlying nineteenth-century reconstructions, which remains inherently limited.
- 1Consumer Price Index, 1800– — Federal Reserve Bank of Minneapolis
- 2US Consumer Price Index dataset and documentation — MeasuringWorth
- 3Consumer Price Index — U.S. Bureau of Labor Statistics
- 4Handbook of Methods: Consumer Price Index — U.S. Bureau of Labor Statistics
A research-first finance team. No lead selling, no lender rankings, no affiliate-pulled recommendations. Every guide pairs primary sources (IRS, CFPB, Federal Reserve, CRA) with the free calculators you can run yourself.
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