See Batter's & Catcher's Box
For home-to-1st and 3rd-to-home, the measurement is taken from the back point, or apex, of home plate to the farthest corner of each of 1st or 3rd base down the foul line. For 1st-to-2nd and 2nd-to-3rd, the measurement is taken from the outfield side of 1st or 3rd base at the corner by the foul line and extends to the center of 2nd base.
1st Base Runner's Lane
The runner’s lane — which is always 3' to the foul side of the 1st base foul line — starts exactly half the distance down the 1st base line and ends at the back edge of 1st base. In other words, it’s marked on the second half of the 1st base line.
Measurement used to ensure the infield is square. May be measured from the back point or apex of home plate to the center of 2nd base. Or, it can be measured from the back corner of 1st base to the back corner of 3rd base.
Infield Arc Radius
Measurement is taken from the center of the front edge of the pitching rubber and extends toward the outfield grass to the distance recommended.
Coach's Box from Foul Line
Measurement for the distance from the foul edge of the foul line to the line in the coach’s box that runs parallel to the foul line.
Coach's Box Length
Distance measured on the long side of the coach’s box.
Coach's Box Width
Distance measured on the short side of the coach’s box.
Batter's Box Length
Distance from front to back of the batter’s box.
Batter's Box Width
Distance from the inside edge of the batter’s box ￼￼￼￼to the outside edge of the batter’s box.
Distance to Backstop
Distance from the back point of home plate (apex) to any portion of the backstop. Distance listed in the table is the minimum for that league. This distance can be greater than the minimum distance, but it cannot be any less.
Minimum Fence Distance
Minimum distance from the apex of home plate, down the right and left field foul lines to the outfield fence.
Minimum Centerfield Fence Distance
Minimum distance from the apex of home plate, along the playing field centerline to the center field fence.
Measurement from the center of the mound outward to the length indicated.
Pitching Rubber Distance
Measurement from the apex of home plate along the centerline to the front center of the pitching rubber on the pitcher’s mound.
Center of Mound
Measured along the imaginary centerline running from the apex of home plate to the center of 2nd base. Measurement runs from the apex of home plate along the centerline to the distance recommended.
Height of the mound at the top of the pitching rubber with respect to the reference point prescribed by the governing body of the league. (Example: Height of mound should be X-inches higher than the surface of home plate.)
Home Plate Radius
Measurement from the apex of home plate outwards to the distance recommended.
Base Cutout Radius
At 1st and 3rd base, the measurement is taken from the back corner of the base inward to the infield grass to the distance recommended. At 2nd base the measurement begins at the center of the base and extends inward to the infield grass to the distance recommended.
1st & 3rd Baseline Width
Width of the skinned baseline. Typically measured from the foul edge of the foul line. Orientation of the foul line in the baseline is at the groundskeepers discretion. Since the 1980s, baseball groundskeepers have moved the foul line to within 1 ft of the infield grass because runners almost always run on the foul side of the foul lines, meaning there is rarely any wear on the fair side of the foul lines. This puts the majority of the skinned area on the foul side of the line where most of the traffic occurs. Prior to this practice becoming standard, the foul line was placed in the middle of the skinned baseline.