When using the CPI/RPI, the (average) value in 2020 of £21500000 from 1997 is $57483958.00. The range of values is from $49777631.69 to $70478261.99. This answer is better if the subject is a consumer good or something else of interest to an individual.
When using the GDP deflator, the (average) value in 2020 of £21500000 from 1997 is $51827795.72. The range of values is from $42726726.41 to $64263986.45. This answer is better if the subject is a capital investment or government expenditure
| Value in 2020 of £21500000 from 1997 | |||
|---|---|---|---|
| Converted in | Converted using | Average dollar price per pound that year | |
| CPI / RPI | GDP Deflator | ||
| 1997 | $56788418.52 | $53513938.73 | 1.638 |
| 1998 | $58505175.12 | $54223826.94 | 1.657 |
| 1999 | $56720054.22 | $52901184.06 | 1.617 |
| 2000 | $52955722.67 | $49032180.79 | 1.516 |
| 2001 | $49777631.69 | $46210315.59 | 1.440 |
| 2002 | $51990156.79 | $48518283.16 | 1.502 |
| 2003 | $56910713.93 | $53000133.24 | 1.635 |
| 2004 | $64001176.67 | $59385437.07 | 1.833 |
| 2005 | $63222966.76 | $58878967.86 | 1.820 |
| 2006 | $63996638.80 | $59436295.91 | 1.843 |
| 2007 | $70478261.99 | $64263986.45 | 2.002 |
| 2008 | $65370568.68 | $60419739.39 | 1.855 |
| 2009 | $55116928.37 | $51645092.01 | 1.566 |
| 2010 | $55970235.00 | $51143005.58 | 1.545 |
| 2011 | $59268364.49 | $53164361.58 | 1.604 |
| 2012 | $59214308.57 | $52375801.32 | 1.586 |
| 2013 | $59329865.26 | $51881778.85 | 1.564 |
| 2014 | $62982065.13 | $54447924.93 | 1.649 |
| 2015 | $58900730.67 | $50353973.89 | 1.529 |
| 2016 | $52284679.21 | $44927599.13 | 1.350 |
| 2017 | $50539818.05 | $42850099.48 | 1.287 |
| 2018 | $52845989.77 | $44258109.29 | 1.334 |
| 2019 | $51157684.28 | $42726726.41 | 1.282 |
| 2020 | $51286837.36 | $44308335.59 | 1.282 |
| Average | $57483958.00 | $51827795.72 | |
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Lawrence H. Officer and Samuel H. Williamson, "Computing 'Real Value' Over Time With a Conversion Between U.K. Pounds and U.S. Dollars, 1791 to Present", MeasuringWorth, URL http://www.measuringworth.com/exchange/
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