I found some American figures. It's very hard to compare prices over decades, and centuries even harder. However, we need some feel for it. I dug out some American figures. With a base of 100 for 1967 (Dept of Commerce figures), the price level in 1800 was 51. That is interesting, because it means that the price level only doubled in nearly 170 years. It had shot up sharply during the Civil War, but fell again afterwards. We've had a lot of inflation since 1967, however, and in 2002 the consumer price index stood at 543 ― 5.4 times the 1967 level, and 10.8 times the 1800 level. Figures are of course more sparse for the earlier period. However, Commerce estimates the price level in 1770 at 80, using 1850-59 as a base for 100. The Revolutionary War years showed very high prices, but they were temporary and subsided when the war ran down. And things are a bit of a mess with many currencies going in the period. You'll notice most estates are still stated in pounds sterling ― indeed, often until well after the war, many remain in sterling. Unless it is right in the 1779-1781 years of very high inflation, we can figure the 1770 price at 80% of 1860 prices. So 10.8 divided by .8 is 13.5. VERRY RRoughly then, multiply your pre-Revolution figure by 14. Post-Revolution prices were above 1850s prices, so multiply by 9 or 10. Yes, I am an economist, but I won't stake my reputation on these quick and dirty figures. The British figures are of interest, but after the First World War began, American and British inflations moved in quite different ways. It is interesting to contemplate, however, that we have lived through the most inflationary period in American history. My maternal grandfather (1878-1944) would have seen inflation only in the last year or so of his life. Prices went up in the First World War, but down again in the calamatous Depression years. Wilson Brown.