Given the time span it is difficult to understand values. The following figures are intended to help. They are based on the Composite Commodity Price Index (used by the American Antiquarian Society) and, more recently, the UK Retail Prices Index. The factor in the second column is the amount by which you multiply the figure quoted in a particular year to arrive at a value in today's money terms. Because of sometimes wild variations in commodity prices I have also shown a trend line which probably gives a more realistic figure for general use. Thus, an amount of £100 quoted in 1740 is multiplied by £92.12 to give a current value of £9,212, or the trend line figure of £9,417.
| Date | Index | Trend |
| 1600 | £129.33 | £130.96 |
| 1610 | £117.85 | £127.77 |
| 1620 | £122.32 | £125.00 |
| 1630 | £99.64 | £121.85 |
| 1640 | £108.50 | £119.76 |
| 1650 | £70.74 | £117.06 |
| 1660 | £86.80 | £116.36 |
| 1670 | £102.82 | £114.68 |
| 1680 | £104.48 | £111.92 |
| 1690 | £115.74 | £108.89 |
| 1700 | £88.33 | £104.93 |
| 1710 | £74.36 | £102.54 |
| 1720 | £93.45 | £100.95 |
| 1730 | £98.98 | £97.88 |
| 1740 | £92.12 | £94.17 |
| 1750 | £100.52 | £90.71 |
| 1760 | £92.30 | £86.29 |
| 1770 | £83.12 | £82.20 |
| 1780 | £81.18 | £78.54 |
| 1790 | £68.08 | £74.73 |
| 1800 | £37.87 | £71.81 |
| 1810 | £35.51 | £71.61 |
| 1820 | £43.82 | £71.64 |
| 1830 | £51.76 | £70.76 |
| 1840 | £46.11 | £68.83 |
| 1850 | £61.25 | £67.37 |
| 1860 | £45.14 | £63.69 |
| 1870 | £47.82 | £61.79 |
| 1880 | £50.54 | £59.19 |
| 1890 | £62.60 | £55.70 |
| 1900 | £59.70 | £49.38 |
| 1910 | £59.70 | £42.38 |
| 1920 | £22.89 | £33.82 |
| 1930 | £46.53 | £32.32 |
| 1940 | £37.68 | £23.65 |
| 1950 | £18.80 | £15.03 |
| 1960 | £13.32 | £10.51 |
| 1970 | £9.10 | £6.48 |
| 1980 | £2.52 | £2.57 |
| 1990 | £1.34 | £1.34 |
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