7 baseballs wide
17" width of home plate...
his # is already retired because 42 is retired major league baseball wide.
In Major League Baseball, the pitcher's plate, or pitching rubber, is 24 inches long and 6 inches wide.
According to http://www.infoplease.com/ipa/A0113430.html, the batter's box is 4 feet X 6 feet. In major league baseball the batters box is 60 inches long and 40 inches wide.
Six feet long by four feet wide
In Major League Baseball, there is no limit, this is why you see some players taking very wide turns. However, if he goes into the dugout or something like that, he could be called out.
The dimensions of a Little League batter's box is 3 feet wide by 6 feet long.
"Little League" baseball teams cover a wide range of ages. The "Minor Leagues" specifically cover the ages of 9 to 10, while Tee Ball covers younger ages and Major Leagues cover older ages, up to 18.
The runners lane going down the first base line is 45 feet long and 3 feet wide, begins halfway down the line and ends at first base.
There is no distance from the batter's box to home plate. The batter's box is adjacent to the 8 1/2 inch side of home plate. They are 4 feet wide and 6 feet long for major league baseball.