League Leaders Who Led?

MLB Single-Season First Base Range Factor Record Progression

Every season that raised the bar, and the leader in every season between.

All-time career leaders →

The MLB single-season first base range factor record is 13.40, set by Herman Dehlman in 1874. It has stood for 152 years. The mark has been raised 3 times since 1871.

SS ASS POSS DPSS FPCTSS RFSS GSS E2B A2B PO2B DP2B FPCT2B RF2B G2B E3B A3B PO3B DP3B FPCT3B RF3B G3B EC POC AC DPC FPCTC RFC GC E1B PO1B A1B DP1B FPCT1B RF1B G1B EOF POOF AOF FPCTOF RFOF GOF EP AP POP FPCTP RFP GP E

Record Holders

4 marks since 1871
Year Player 1B RF Stood for
1874 Herman Dehlman 13.40 still standing
1873 Herman Dehlman 12.80 1 year
1872 Herman Dehlman 12.46 1 year
1871 Denny Mack Denny Mack 11.54 1 year

The earliest marks here are records only in the sense that nobody had done better yet. Season length, schedule and the rules themselves have all changed, so a figure from the 1870s is not comparable with a modern one and is not offered as though it were.

Every Season

155 seasons
Year Leader 1B RF
2025 Willson Contreras 8.69
2024 Paul Goldschmidt 8.79
2023 Paul Goldschmidt 8.74
2022 Paul Goldschmidt 9.08
2021 C. J. Cron 8.69
2020 Jose Abreu 8.46
2019 Daniel Murphy 9.26
2018 Paul Goldschmidt 9.25
2017 Mark Reynolds 9.28
2016 Paul Goldschmidt 9.52
2015 Paul Goldschmidt 9.56
2014 Justin Morneau 9.59
2013 Paul Goldschmidt 10.02
2012 Freddie Freeman 9.38
2011 Albert Pujols 9.72
2010 Albert Pujols 10.29
2009 Albert Pujols 10.43
2008 Albert Pujols 9.94
2007 Todd Helton 10.09
2006 Albert Pujols 10.20
2005 Albert Pujols 10.79
2004 Albert Pujols 10.48
2003 Carlos Delgado 9.92
2002 Carlos Peña 9.57
2001 Carlos Delgado 10.07
2000 Jason Giambi 9.84
1999 Kevin Young 9.74
1998 Rafael Palmeiro 9.81
1997 Andres Galarraga 10.23
1996 Andres Galarraga 10.34
1995 Andres Galarraga 9.99
1994 Don Mattingly 10.18
1993 Don Mattingly 10.32
1992 Mark Grace 10.96
1991 Mark Grace 10.54
1990 Will Clark 10.29
1989 Wally Joyner 9.98
1988 Will Clark 10.10
1987 Gerald Perry 10.00
1986 Bob Horner 10.65
1985 Steve Balboni 10.46
1984 Eddie Murray 10.57
1983 Keith Hernandez 10.87
1982 Keith Hernandez 10.89
1981 Keith Hernandez 11.63
1980 Chris Chambliss 10.93
1979 Chris Chambliss 10.40
1978 Jason Thompson 10.56
1977 Jason Thompson 10.73
1976 Jason Thompson 10.64
1975 John Mayberry 9.92
1974 Steve Garvey 10.24
1973 John Mayberry 10.32
1972 Chris Chambliss 9.79
1971 Carlos May 9.69
1970 Wes Parker 10.08
1969 Joe Pepitone 10.06
1968 Donn Clendenon 11.07
1967 Donn Clendenon 10.47
1966 Donn Clendenon 10.18
1965 Ernie Banks 10.96
1964 Ernie Banks 10.81
1963 Donn Clendenon 10.38
1962 Ernie Banks 10.50
1961 Joe Adcock 10.63
1960 Roy Sievers 10.02
1959 Vic Power 9.50
1958 Dick Gernert 10.47
1957 Stan Musial 9.74
1956 Bill White 9.91
1955 Gil Hodges 9.92
1954 Gil Hodges 9.83
1953 Steve Bilko 10.20
1952 Whitey Lockman 10.04
1951 Ferris Fain 9.67
1950 Don Kolloway 9.93
1949 Mickey Vernon 10.41
1948 Lennie Pearson 10.25
1947 Jake Jones 10.30
1946 Bert Haas 10.26
1945 Buck Leonard 10.98
1944 Buck Leonard 11.44
1943 Zack Clayton 11.17
1942 Archie Ware 11.25
1941 Buck Leonard 10.84
1940 Elbie Fletcher 10.99
1939 Elbie Fletcher 10.67
1938 Mint Jones 11.56
1937 Elbie Fletcher 11.45
1936 Zeke Bonura 11.01
1935 Zeke Bonura 10.90
1934 Bill Terry 11.09
1933 Joe Scott 11.61
1932 Dave Thomas 10.93
1931 Bill Sweeney 11.09
1930 Ed Rile 11.45
1929 Bill Terry 11.32
1928 Ed Rile 11.75
1927 Bill Terry 11.51
1926 Phil Todt 12.21
1925 Earl Sheely 10.85
1924 Willie Bobo 12.06
1923 Edgar Wesley 12.25
1922 Lemuel Hawkins 11.83
1921 Ben Taylor 11.56
1920 George Kelly 12.01
1919 Hal Chase 11.87
1918 Stuffy McInnis 12.10
1917 Stuffy McInnis 11.69
1916 Vic Saier 11.54
1915 George Stovall 11.66
1914 George Burns 12.10
1913 Del Gainer 11.34
1912 Stuffy McInnis 10.67
1911 Ed Konetchy 10.91
1910 George Stovall 11.33
1909 Jake Stahl 11.14
1908 George Stovall 12.08
1907 Jiggs Donahue 12.65
1906 Jiggs Donahue 11.79
1905 Tom Jones 11.90
1904 Tom Jones 11.46
1903 John Ganzel 11.47
1902 George LaChance 11.52
1901 Harry Davis 11.52
1900 Jake Beckley 10.59
1899 Bill Everitt 11.66
1898 Tommy Tucker 11.29
1897 Perry Werden 10.94
1896 Patsy Tebeau 11.60
1895 Jake Beckley 10.79
1894 Jack Doyle 10.45
1893 Roger Connor 11.16
1892 Lew Whistler 11.15
1891 John Reilly 11.30
1890 Roger Connor 11.50
1889 Cap Anson 11.10
1888 Bill Phillips 11.87
1887 Billy O'Brien 11.39
1886 Mox McQuery 11.03
1885 Cap Anson 11.54
1884 John McGuinness 11.71
1883 Charlie Comiskey 11.51
1882 Charlie Comiskey 11.35
1881 Cap Anson 11.13
1880 Joe Start 11.76
1879 Joe Start 12.15
1878 Joe Start 12.00
1877 Joe Start 11.90
1876 Joe Gerhardt 12.54
1875 Herman Dehlman 12.85
1874 Herman Dehlman 13.40 new record
1873 Herman Dehlman 12.80 new record
1872 Herman Dehlman 12.46 new record
1871 Denny Mack 11.54 new record