The following is based on an official ACT ACT-SAT concordance chart.[45][46] ACT percentiles are calculated on the basis of the percent of test takers scoring the same score or a lower one, not (as is the case for many other assessments) only the percent scoring lower.
Reference 1: ACT composite score and The percentile of students at or below this score for the ACT (not SAT).
Reference 2: 2380–2400, 2290–2370, 2220–2280, 2140–2210, 2080–2130, 2020–2070, 1980–2010, 1920–1970, 1860–1910, 1800–1850, 1740–1790, 1680–1730, 1620–1670, 1560–1610, 1510–1550, 1450–1500, 1390–1440, 1330–1380, 1270–1320, 1210–1260, 1140–1200, 1060–1130, 990–1050, 910–980, 820–900 and 750–810.
Source: http://en.wikipedia.org/wiki/ACT_(examination)
Reference 2: 2380–2400, 2290–2370, 2220–2280, 2140–2210, 2080–2130, 2020–2070, 1980–2010, 1920–1970, 1860–1910, 1800–1850, 1740–1790, 1680–1730, 1620–1670, 1560–1610, 1510–1550, 1450–1500, 1390–1440, 1330–1380, 1270–1320, 1210–1260, 1140–1200, 1060–1130, 990–1050, 910–980, 820–900 and 750–810.
Source: http://en.wikipedia.org/wiki/ACT_(examination)

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