Baseball Diamond
Courts & Fields · 10 specs
Direct Answer
Official baseball diamonds are regulated by Major League Baseball (MLB Official Baseball Rules Rule 2.01). The infield is a 90 × 90 ft (27.43 × 27.43 m) square rotated 45 degrees. The pitcher's rubber is located exactly 60 ft 6 in (18.44 m) from the back tip of home plate on a mound raised 10 in (25.4 cm). Regulation outfield fences typically range from 325–350 ft at the foul poles to 400+ ft in center field.
Source: MLB (Major League Baseball) Official Baseball Rules Rule 2.01: Layout of the Field · Last reviewed Aug 28, 2026
Specs
| Base Path Distance | 27.43 m (90.0 ft between consecutive bases) |
| Pitching Distance | 18.44 m (60.0 ft 6.0 in from home plate apex to rubber) |
| Pitcher's Mound Height | 25.4 cm (10.0 in above home plate level) |
| Pitcher's Mound Diameter | 5.49 m (18.0 ft circular circle) |
| Pitcher's Rubber Plate | 61.0 × 15.2 cm (24.0 × 6.0 in white rubber) |
| Home Plate Geometry | 5-Sided 17-Inch Pentagon (17" front, 8.5" sides, 12" apex) Standard |
| MLB Base Size (Enlarged 2023) | 45.72 × 45.72 cm (18.0 × 18.0 in square foam-filled canvas) |
| Home to 2nd Base Diagonal | 38.79 m (127.0 ft 3.375 in) |
| Recommended Minimum Foul Pole Distance | 97.54 m (320.0 ft minimum along foul lines) |
| Recommended Minimum Center Field Distance | 121.92 m (400.0 ft minimum) |
The 60'6" Mound Geometry & 2023 Enlarged Bases
- 60 Feet 6 Inches Origin: Established in 1893 by the National League (moved back from 50 ft). The mound rises at a slope of 1 inch per foot beginning 6 inches in front of the pitcher's rubber plate.
- 2023 Base Enlargement (15" → 18"): Major League Baseball increased 1st, 2nd, and 3rd base dimensions from 15 inches to 18 inches square, shortening the base-to-base running distance by 4.5 inches to improve player collision safety and promote stolen base attempts.