What is the mercy rule in slowpitch softball?

Under USA Softball rules, most adult slowpitch games end when a team leads by 20 after three innings, 15 after four, or 10 after five. NSA uses 15, 12 and 10. Local leagues often set their own.

What is the mercy rule in fastpitch softball?

USA Softball women's fastpitch uses 15 runs after three innings, 12 after four, or 8 after five. NSA fastpitch uses 12, 10 and 8.

Does the home team get to bat when the mercy rule is reached?

Yes. If the visiting team reaches the run limit in the top of an inning, the home team still bats in the bottom of that inning.

Is a five-run inning limit an official softball rule?

Not in most adult divisions. National rulebooks use per-inning caps mainly in senior play. Many rec leagues add a five-run limit as a local rule.

Softball Mercy Rule by Organization

By Patrick Poulin · Updated October 29, 2026

The mercy rule, or run rule, ends a softball game early when one team is far enough ahead after a set inning. In USA Softball slowpitch it's 20 runs after three innings, 15 after four, or 10 after five. NSA adult slowpitch uses 15, 12 and 10; USSSA's limits depend on the division. Local leagues set their own, so check your rule sheet.

How the mercy rule works#

A mercy rule (also called a run rule or run-ahead rule) ends the game when one team leads by a set number of runs after a set number of innings. Under USA Softball and NSA rules the home team still gets its turn: if the visitors reach the limit in the top of an inning, the game isn't over until the home team has batted.

USA Softball#

From the 2026 Official Rules of Softball. USA Softball requires a run-ahead rule at its National Championships; leagues may set their own.

Slowpitch

Most adult slowpitch: 20 after 3 innings, 15 after 4, or 10 after 5.
Men's Class A and B, Women's Open and Seniors: 20 after 4, or 15 after 5.
16-inch slowpitch: 12 after 4, or 10 after 5.

Fastpitch and modified

Men's fastpitch: 15 after 3, 12 after 4, or 7 after 5.
Women's and junior fastpitch: 15 after 3, 12 after 4, or 8 after 5.
Modified pitch: 15 after 3, 12 after 4, or 10 after 5.

USSSA slowpitch#

From the 2026 Official Slow Pitch Rule Book:

Men's B and C: 25 after 3, 20 after 4, 15 after 5.
Men's D and E: 20 after 3, 15 after 4, 10 after 5.
Women's, all divisions: 20 after 3, 15 after 4, 10 after 5.
Mixed (coed) Major: 30 after 3, 20 after 4, 15 after 5.
Mixed B through E: 20 after 3, 15 after 4, 10 after 5.

USSSA adds a flip-flop rule: when the home team is losing by more than the run rule, it stays at bat and becomes the visiting team for that inning, so the game can end the moment the trailing team fails to close the gap. State programs may adopt their own run rule.

NSA#

From the 2026 NSA Slowpitch and Fastpitch Rulebooks:

Adult slowpitch, including coed: 15 after 3, 12 after 4, or 10 after 5.
Men's A and B slowpitch: 20 after 3, 20 after 4, or 12 after 5.
Fastpitch: 12 after 3, 10 after 4, or 8 after 5.

Senior Softball-USA#

From the 2026 Senior Softball-USA Rulebook: Major Plus is 22 after 4 innings, then 15 after 5 or 6. Every other division is 20 after 4, then 15 after 5 or 6.

Per-inning run limits#

Many rec leagues also cap the runs a team can score in one inning, often at five, with the last inning "open" (unlimited). That's mostly a local league rule. In the national rulebooks it appears only in senior play: USA Softball's men's senior slowpitch (7 runs in Major and Major Plus, 5 in AAA and AA), NSA senior play, and Senior Softball-USA (5 runs, 7 in some Major Plus divisions), each with an unlimited last inning.

Writing your league's rule#

Pick one rule and print it on your rule sheet: the run margin, the inning it starts, whether it applies in playoffs, and whether there's a per-inning cap. Then a lopsided game ends the same way every time, whoever is umpiring.

Common Questions

What is the mercy rule in slowpitch softball?: Under USA Softball rules, most adult slowpitch games end when a team leads by 20 after three innings, 15 after four, or 10 after five. NSA uses 15, 12 and 10. Local leagues often set their own.
What is the mercy rule in fastpitch softball?: USA Softball women's fastpitch uses 15 runs after three innings, 12 after four, or 8 after five. NSA fastpitch uses 12, 10 and 8.
Does the home team get to bat when the mercy rule is reached?: Yes. If the visiting team reaches the run limit in the top of an inning, the home team still bats in the bottom of that inning.
Is a five-run inning limit an official softball rule?: Not in most adult divisions. National rulebooks use per-inning caps mainly in senior play. Many rec leagues add a five-run limit as a local rule.

About the author. Patrick Poulin founded Softball.love and manages adult rec softball teams. More about Patrick →