How Fastpitch Softball Works

By 4Baseball Staff · November 5, 2026 · 11 min read

A clear introduction to fastpitch softball: the field, the ball and bat, the underhand windmill pitch, hitting and baserunning rules, a seven-inning game, and how it compares with baseball.

Fastpitch softball looks like baseball played on a smaller diamond, and for the first inning that description is good enough. The bases are closer, the ball is bigger, and the pitcher throws underhand. Those differences change nearly everything else: how a hitter sees the ball, how a runner steals, and why a one-run lead in the late innings feels so large.

This guide explains how the game works for someone who has watched baseball but never followed softball, or who is about to watch a daughter's first tournament. It covers the field and equipment, the structure of a game, the windmill pitch and the rules that govern it, hitting and baserunning, defense, and the levels of play from youth leagues to the Olympics. Where the details vary by league, the text says so, because softball has several governing bodies and each writes its own rulebook.

The field and the equipment

A fastpitch field is a compressed baseball field. The bases are 60 feet apart, compared with 90 feet in baseball. The pitcher throws from a flat circle and not from a raised mound, and the distance from the pitching plate to home plate is 43 feet in the usual rule sets for high school, college and adult play. Younger divisions use shorter distances set by their governing bodies. Home plate is the same 17-inch width as in baseball. Outfield fences are commonly in the range of 200 to 220 feet for older players, much closer than in a professional baseball park.

The ball is larger and, despite the name, is not soft. It has a core and a cover and is thrown hard enough to demand a glove, a catcher's mask and helmets with face protection. Bats must be certified by the governing body for the level of play, and the certification mark is printed on the barrel. Fastpitch bats are made lighter than baseball bats of the same length, and the weight difference is described by the bat's "drop," the length in inches minus the weight in ounces. A bigger drop means a lighter bat. Check your league's bat rule before buying, because a bat approved for one organization can be illegal in another.

Players wear helmets at the plate and on the bases in most rule sets, and many wear a face mask in the infield, particularly pitchers and corner infielders. Catchers wear the same protective gear as in baseball. If you are shopping for a young player, follow the league's published equipment rules and a coach's guidance and not a marketing claim.

The shape of a game

A game has seven innings. Each team bats until it makes three outs, the home team bats second, and the winner is the team with more runs after seven innings, unless the game ends early or goes to extra innings.

There are three rules that surprise new viewers.

• The run rule. Most organizations end the game early when one team leads by a large margin after a set number of innings. The exact numbers differ, and a common version is a lead of eight runs after five innings. Check your league's rule.
• The extra-inning runner. In many rule sets, if the game is tied after seven innings, each team starts its turn at bat in extra innings with a runner on second base. The aim is to end ties faster and protect pitchers' arms.
• The designated player and flex. In many rule sets the lineup can include a designated player (DP), who hits but does not play defense, and a FLEX, who plays defense. The arrangement lets a coach keep both a strong hitter and a strong fielder in the game. The substitution rules are detailed, so read your rulebook before you rely on them.

Scoring and counting match baseball. Four balls are a walk, three strikes are an out, three outs end the half-inning, and a runner scores by touching all four bases. The infield fly rule applies, as do the usual rules for foul balls, force plays and tag plays. If you know baseball's scorekeeping, you can keep a softball scorebook; the scoresheet tool on this site works for either.

The windmill pitch

The defining feature of fastpitch is the pitching motion. The pitcher starts with the pivot foot on the pitching plate, swings the throwing arm in a full circle, a motion called the windmill, and releases the ball underhand near the hip as she strides toward the batter. The windmill pitching motion is covered in detail in its own article, and it is worth reading if you coach. The rules, in brief:

• The pitcher must bring both hands together with the ball and pause before the pitch, so the umpire can see the start of the delivery; the rulebook sets limits on how long the pause may last.
• The pivot foot must stay in contact with the plate until the push-off, and the stride must go forward, toward the batter.
• The release must be underhand, with the hand and wrist passing close to the hip; the rulebooks set the exact limits.
• Rule sets differ on how much the pitcher may leap or drag the pivot foot, which is why umpires spend a lot of time watching the feet. The details are a regular source of illegal-pitch calls.

An illegal pitch usually results in a ball for the batter and an advance for runners, so the umpire's call matters.

Pitchers throw several pitches. The fastball is the foundation. The change-up is a slower pitch that disrupts timing. Movement pitches include the drop, which breaks downward, the curve and the screwball, which break sideways in opposite directions, and the rise, which is thrown with backspin. The rise does not truly climb in most physical analyses; backspin makes the ball fall less than a batter expects, which looks like rising. That distinction explains why hitters swing under it.

Why the reaction time is short

Underhand does not mean easy. Consider a worked example with illustrative numbers, not measurements. A 65-mile-per-hour fastpitch pitch travels about 95 feet per second. The pitcher releases the ball several feet in front of the pitching plate because of her stride, so the ball covers perhaps 38 feet. That takes about 0.4 seconds. A 90-mile-per-hour baseball pitch travels about 132 feet per second and covers perhaps 54 feet from the release point, which takes about 0.41 seconds.

The reaction times are nearly the same, even though the softball is thrown far more slowly. The shorter distance cancels the lower speed, and the spin on the ball can make it break sharply. That is why a good fastpitch pitcher can be as hard to hit as a good baseball pitcher.

Hitting and the strike zone

The strike zone is the area over home plate between the batter's armpits and the top of her knees. The pitch must pass through the zone to be a strike unless the batter swings. Because the ball arrives in about the same time as a baseball pitch and may rise or drop, coaches commonly teach a short, compact swing.

Two kinds of hitting are more common in softball than in baseball. The first is the slap. A left-handed hitter, who stands on the first-base side of the plate and is already a step closer to first base, starts moving toward the pitch as it approaches, then hits a soft ground ball to the left side of the infield. The goal is to reach first base on speed. The second is the bunt, which is often used to move runners over. Both are legal, and both put pressure on infielders to charge and throw quickly.

Power is part of the game, too. At the higher levels, home runs are an important part of the offense. The home run rules are the same as baseball's: a fair ball over the fence is a home run, and the fence is much closer than in a baseball park.

Baserunning: leaving on the release

The most important baserunning rule differs from baseball. In fastpitch, a runner may not leave her base until the pitcher releases the ball. A runner who leaves early can be called out, with the penalty depending on the rule set. So there are no lead-offs in the baseball sense. Runners start from the base, at the instant of release, and run.

Stealing is still a huge part of the game. With bases only 60 feet apart, a fast runner reaches the next base quickly, while a catcher must catch the pitch, transfer the ball and throw. The result is a game where the catcher's throwing arm matters and where a single walk can turn into a run quickly. A runner on second base is in scoring position on almost any single. That is the logic behind starting extra innings with a runner on second.

Tag-ups, force plays, rundowns and obstruction work as in baseball. Sliding is common, and many leagues require runners to slide or avoid contact at certain bases; the exact rules and the safe-sliding guidance vary. Follow the league's rules and a coach's instruction.

Defense and positions

Nine players take the field: a pitcher, a catcher, four infielders and three outfielders. The positions have the same names as in baseball. Because the field is smaller, the infielders play closer to the batter, and the corner infielders charge hard on bunts and slaps. Softball positions and defense goes through each spot.

The catcher's role is large. A fastpitch catcher calls the pitches in many programs and has to throw out runners who left on the release. Pitchers throw a lot of pitches in a tournament weekend, and youth organizations publish their own limits on pitching; follow your organization's guidelines and an informed coach, and talk to a doctor if a pitcher has pain.

Keeping score: ERA is per seven innings

Softball statistics use the same names as baseball, with one adjustment that trips up newcomers. Because a regulation game is seven innings, earned run average is figured per seven innings and not per nine. The formula is earned runs times seven, divided by innings pitched. A pitcher who allows 2 earned runs in a complete seven-inning game has an ERA of 2.00 for that game. The same performance in baseball terms, 2 earned runs in 7 innings, would work out to 2.57 per nine innings, so you cannot compare a softball ERA with a baseball ERA directly.

Batting average, on-base percentage and slugging percentage are computed the same way as in baseball. The stat calculator on this site handles the baseball formulas, and you can adapt the ERA formula by hand with the multiplier of seven. Pitchers are also judged on strikeouts per seven innings and on walks, since control is a large part of what separates a pitcher who dominates from one who gets hit hard.

Watching your first game

A short walk through a half-inning shows how the rules fit together. A leadoff hitter walks on four pitches. The next hitter, a left-handed slapper, runs toward the pitch and chops a ground ball to the shortstop, who has to charge, field and throw to first quickly; if she is late, the batter is safe and the first runner moves to second. With runners on first and second and nobody out, the defense is under pressure: the pitcher cannot afford a walk, and the catcher is ready to throw out a runner who breaks on the release.

The third hitter bunts the runners over, and the coach now has a choice between playing for one run or trying for more. A single would score the runner from second, because the bases are close together. With a runner on third, defenses often play the infield in on the grass to cut off the run. From this one half-inning you can see the main ideas of the game: contact over power in many innings, a premium on speed and bunting, and a defense that must react in a split second.

If you are new to the sport, three things are worth watching. First, the pitcher's feet, because the illegal-pitch call depends on them. Second, the runners, who must stay on their bases until the ball is released. Third, the count, because a good fastpitch hitter will take a pitch outside the zone and wait for a mistake.

Levels of play

Fastpitch is played at nearly every level. Youth leagues run by age group, with shorter distances and, in some divisions, a smaller ball. High school and college play follow rule sets published by their governing bodies. College fastpitch is a national sport, and its championship is the Women's College World Series. Adult leagues and travel tournaments fill the summer, and some recreation leagues play slowpitch, a different game with an arc pitch and ten players, explained in fastpitch versus slowpitch.

Softball has also been an Olympic sport. It appeared in the Games from 1996 through 2008, returned for Tokyo, was not on the program in Paris in 2024, and is scheduled to return for Los Angeles in 2028. The international governing body for the sport is the World Baseball Softball Confederation.

Common questions

Is the ball soft? No. The name dates to an early version of the game, and today's ball is firm and thrown hard.

Why is the pitching distance shorter? Because the field is smaller and the pitcher throws underhand. The two changes together are balanced so the pitch is challenging but fair.

Can a runner lead off? No. A runner must stay on the base until the ball is released.

What is the difference between fastpitch and slowpitch? In fastpitch the pitcher throws fast and hard from 43 feet with a windmill delivery. In slowpitch the pitcher lobs the ball in an arc, the defense has ten players in many leagues, and stealing is not allowed in most.

Do all organizations use the same rules? No. USA Softball, the NCAA, high school federations and travel organizations publish different rulebooks. Check the rules for your league before you rely on any detail, including the ones here.

Where to go next

Learn the pitching motion in the windmill article, then follow the college game through the Women's College World Series. For more on the sport on this site, visit the softball section and the softball topic page.