Baseball Diamond Diagram: Field Dimensions, Distances and Layout

A baseball diamond looks simple from the stands, but every line and distance on it has a purpose. This guide gives you a plain diagram of the field and the standard distances used at the top levels, then explains how youth fields differ and how to read the layout when you watch or play. If you are looking for who plays where, our guide to baseball positions explained covers the players. This page is about the field itself.

Baseball diamond diagram

The infield is a square rotated so that one corner points at home plate. Here is a simple text diagram, with the standard position numbers in brackets:

                    Center field (8)
       Left field (7)               Right field (9)

                      Second base
                 Shortstop (6)  2nd baseman (4)

     Third base (5)     Pitcher (1)     First base (3)

                       Home plate
                      Catcher (2)

Real fields are not drawn in a perfect figure, and the exact shape of the outfield changes from park to park. Think of the diagram as a map of the infield with the outfield fanning out behind it.

The standard distances

At the professional level and in most adult baseball, the dimensions are fixed by the official rules:

The base paths form a square 90 feet on each side. Home plate and the three bases are the corners. The pitcher's plate sits a little beyond the center of the square, which is why the distance from home to the rubber is 60 feet 6 inches rather than 63.6 feet, the exact middle.

The infield

The infield includes the four bases and the dirt or grass around them. First, second and third base are white canvas bags fixed to the ground. Home plate is a five-sided slab of white rubber. The area of dirt between the bases and the mound is where most ground balls are fielded.

• Base paths: the lines running between bases, 90 feet each at the top levels. A runner must stay close to the line when a fielder is making a play on him.
• The infield grass and dirt cutouts: groundskeepers shape these differently from park to park.
• Foul lines: these run from home plate past first and third base to the outfield wall. They are at a right angle to each other, so the fair territory is a quarter of a circle in shape. A ball that lands on the line is fair.

The pitcher's mound

The mound is a raised circle of dirt in the middle of the infield. The pitcher stands on it and pushes off a white rubber slab called the pitcher's plate or rubber. In professional rules, the mound has a maximum height of 10 inches above home plate and a diameter of 18 feet. The slope is built so the pitcher can throw downhill.

Home plate area

Home plate is flanked by two batter's boxes, one on each side. Each box is a rectangle 4 feet wide and 6 feet long in the official rules. The batter must keep both feet inside the box when the pitch is released. Behind home plate is the catcher's box, where the catcher sets up, and further back is the backstop.

On each side of the field there are also:

• On-deck circles: where the next hitter warms up.
• Coaches' boxes: near first and third base, where base coaches stand.
• Dugouts: the team benches.

The outfield

The outfield is the grass area beyond the infield, bounded by the foul lines and the outer fence. The three outfielders cover left, center and right. The fence distance is not the same everywhere. It differs from stadium to stadium and from one level of baseball to another, so no single number applies. Professional rules set minimum recommended distances for new fields, but older and unusual ballparks differ.

The warning track, the strip of dirt in front of the wall, tells an outfielder that the fence is close. Foul poles mark the foul line at the wall.

Youth baseball and different dimensions

Smaller players use smaller fields. Many youth leagues use shorter base paths and a shorter pitching distance, then move up to 90 and 60 feet 6 inches as the players age.

• Younger age groups often use bases about 60 feet apart.
• Middle age groups often use 60 or 70 feet, with the pitching distance increasing with age.
• Teenage players typically move to the full 90-foot field.

The exact numbers depend on the league, so check the rulebook of your own organization before laying out a field. Softball also uses a smaller diamond, as described in softball vs baseball.

How to read the field as a fan

1. Find home plate. The scoreboard and the backstop are usually behind it.
2. Trace the foul lines. Everything between them is fair territory.
3. Locate the mound. The pitcher's position is slightly closer to home than to second base.
4. Count the bases counter-clockwise. A runner goes from home to first, second, third and back to home.
5. Notice the fielders. Where they stand tells you what the defense expects. See baseball positions by number for the scoring numbers.

Why the shapes matter in the game

• 90 feet between bases was designed so close plays are decided by inches. A fast runner and a good throw produce many tight outcomes.
• Foul territory gives fielders room to catch foul balls, and its size varies from park to park.
• The mound gives the pitcher an advantage. In the 1960s the league lowered the maximum mound height. Rules about the mound have changed over time, so the older numbers differ from today.
• Outfield walls change the number of home runs and doubles a park produces.

Marking a field: a short checklist

If you are marking a field for youth games, here is a simple list:

1. Fix home plate first and run a line to where the pitcher's plate will go.
2. Measure the base paths with a long tape, from home to first and from home to third.
3. Check that both foul lines are at a right angle.
4. Measure between first and third base and between second base and home to confirm the square.
5. Set the pitcher's plate at the age-appropriate distance.
6. Mark the batter's boxes next to home plate.

Check every measurement twice, and use the dimensions your league gives you.

FAQ

How far apart are the bases on a baseball diamond?

Ninety feet at the professional and most adult levels. Younger age groups often use shorter distances.

How far is the pitcher's mound from home plate?

The pitching rubber is 60 feet 6 inches from home plate in professional and most adult baseball. Younger players pitch from shorter distances.

What shape is a baseball diamond?

The infield is a square, with a corner at home plate. The foul lines extend from home plate past first and third base, forming a right angle.

How big is home plate?

It is 17 inches wide, with a five-sided shape that points toward the catcher.

Are all baseball fields the same size?

No. The infield is fixed by the rules, but outfield fences differ by park and level, and youth leagues use smaller distances.