People often lump all softball bats together, but “fastpitch” and “slowpitch” are two different games with two different kinds of bat. Grab the wrong one and it won’t just feel off — it may be illegal for your league. Here’s how to tell them apart, plus how softball bats differ from baseball bats.
What’s the difference between fastpitch and slowpitch?
The names describe the pitch. In fastpitch, the pitcher fires the ball in fast and flat with an underhand windmill motion, so hitters need a bat they can get to the zone quickly. Fastpitch bats are usually lighter and more balanced, and they come in a range of drops — commonly around −8 to −13 — so younger and lighter hitters can still generate bat speed.
In slowpitch, the ball arrives in a slow, high arc, and the batter supplies all the power. Because the swing isn’t rushed, slowpitch bats lean heavier and more end-loaded to drive the ball, and they’re often swung at a fixed length and weight (34 inches paired with a heavier barrel is the classic setup). The goal there is mass behind the ball, not quickness.
See our fastpitch bats and slowpitch bats sections for models in each.
Can you use a slowpitch bat for fastpitch (or the other way around)?
Not for sanctioned play. Even though both are “softball” bats with the same 2 1/4-inch barrel, the certification stamps are different, and leagues check for the right one. A slowpitch bat also feels wrong in fastpitch — too heavy and end-loaded to catch up to a quick pitch — and a fastpitch bat usually lacks the end-load a slowpitch hitter wants. Buy for the game you actually play.
How are softball bats different from baseball bats?
Three things set them apart. First, barrel diameter: softball bats are 2 1/4 inches, while baseball bats are typically larger (2 5/8 inches for BBCOR and most travel-ball bats). Second, length: softball bats max out around 34 inches, and slowpitch in particular is almost always swung at that length. Third — and most important — certification. A baseball bat carries a baseball stamp like BBCOR, USSSA, or USA Baseball; a softball bat carries a softball stamp instead. They are not interchangeable, and an umpire won’t let a baseball bat into a softball game or vice versa.
What certification does a softball bat need?
It depends on your league, so confirm before you buy. Fastpitch and slowpitch bats commonly carry stamps from USA Softball (formerly ASA), USSSA, NSA, or ISA, and senior slowpitch has its own SSUSA standard. The stamp is usually printed on the barrel or taper. If you’re not sure which one your league requires, ask the league or check its rulebook — that’s the surest way to avoid buying a bat you can’t use. Our full rundown of stamps lives in our bat certifications guide.
So which one should you buy?
Start with the game: fastpitch or slowpitch. Then match the certification your league requires, and finally pick the length and weight that lets you swing fast and stay on time. For help dialing in size, see what size bat do I need, and for how construction changes the feel, read one-piece vs two-piece and balanced vs end-loaded. Get the category and the stamp right first — everything else is fine-tuning.