MLB: 30 yards, although it's usually referred to as 90 feet.
Other leagues may have different distances.
90 feet = 30 yards.
Almost every baseball field is a different size.
I'm not exactly sure which question your asking, so I'm going to answer it several ways. The bases are 90 feet apart, or 30 yards. And just for the heck of it.. 27.432 meters 1080 inches
If you are talking about the length of a professional field than about 115 yards apart, soccer fields are around 15 yards longer than football fields, but if you just want a youth field about 78 yards away, if you want a small field in a backyard or playground to have fun, at least 15-30 yards
some items that are measrued in US customary are the yards on a football field, and the the length between the bases in baseball.
90 feet = 30 yards
usually its any field. for example, a backyard , a lawn , football field ,even a baseball field.
It all depends on which field you are at. Most MLB parks are from 380 yards to 420 yards.
The general answer is "linear measurement". Specific possibilities would be feet, yards, and meters.
If you're asking how far apart are the two uprights on a single goal post, they are 18 feet 6 inches apart in college and pro, and 23 feet 4 inches apart in high school. If you're asking how far apart is one team's goal post from the other team's goal post on the opposite end of the field, they are 120 yards apart. (10 yards for each end zone and 100 yards for the length of the field in-between.)
A rounders pitch measures 77 yards square with the bases at 27 yards apart. The foul line is outside of the two side adjacent lines.
Officials use yards, as a football field is 100 yards.