what's ERA suppose to mean in baseball???

Question

as titile's described.

Answer 1

Earned Run Average for the pitcher

its the average of runs a pitcher let up in 9 innings

Answer 2

ERA stands for Earned Run Average.

It's a statistic used to compare and evaluate pitches. It's the average number of earned runs a pitcher allows over a nine inning period.

In the current era of baseball, an ERA anywhere near 3.00 is very good.

The difference between earned runs and unearned runs must be understood as well. If baserunners are allowed to get on base and/or score as a result of an error, those runs are considered unearned. They do not count towards a pitchers ERA.

A new stat in recent years, WHIP, measures the Walks and Hits a pitcher allows in the average Innings Pitched.

Answer 3

ERA stands for Earned Run Average (or Equal Rights Amendment, but's that a whole other story). It's a measure of a pitchers effectiveness. It tells you, on average, how many earned runs (runs that score because of errors are not included) the pitcher would give up for every nine innings pitched. You figure an ERA by dividing total runs allowed by total innings pitched, then multiply by nine. For instance, a pitcher has pitched 198 innings and given up 63 runs.
63 / 198 = .318
.318 * 9 = 2.86 ERA, which is pretty good.

Answer 4

Obviously, the question has been answered. ERA = Earned Run Average, the average number of earned runs given up by a pitcher per 9 innings. In today's game, anything below 4.00 is considered pretty good.

A lot of answerers also tried to point out the difference between an earned run and an unearned run. True, that if a baserunner reaches base due to an error, and subsequently scores, that run is unearned. However, there is much, much more to determining whether a run is "earned" or "unearned."

For example, say there are two outs. The next guy up gets on base by an error. For some unknown reason, the pitcher suddenly loses effectiveness and the team begins hitting him all over the place, with the team hitting around and scoring 6 runs, all off of singles, doubles, triples, walks, etc. NONE of these six runs are earned, because the pitcher SHOULD have been out of the inning.

Here are the actual rules from MLB's website about what constitutes an earned run:

EARNED RUNS
10.18
An earned run is a run for which the pitcher is held accountable. In determining earned runs, the inning should be reconstructed without the errors (which include catcher’s interference) and passed balls, and the benefit of the doubt should always be given to the pitcher in determining which bases would have been reached by errorless play. For the purpose of determining earned runs, an intentional base on balls, regardless of the circumstances, shall be construed in exactly the same manner as any other base on balls.
(a) An earned run shall be charged every time a runner reaches home base by the aid of safe hits, sacrifice bunts, a sacrifice fly, stolen bases, putouts, fielder’s choices, bases on balls, hit batters, balks or wild pitches (including a wild pitch on third strike which permits a batter to reach first base) before fielding chances have been offered to put out the offensive team. For the purpose of this rule, a defensive interference penalty shall be construed as a fielding chance.
(1) A wild pitch is solely the pitcher’s fault, and contributes to an earned run just as a base on balls or a balk.
(b) No run shall be earned when scored by a runner who reaches first base (1) on a hit or otherwise after his time at bat is prolonged by a muffed foul fly; (2) because of interference or obstruction or (3) because of any fielding error.
(c) No run shall be earned when scored by a runner whose life is prolonged by an error, if such runner would have been put out by errorless play.
(d) No run shall be earned when the runner’s advance is aided by an error, a passed ball, or defensive interference or obstruction, if the scorer judges that the run would not have scored without the aid of such misplay.
(e) An error by a pitcher is treated exactly the same as an error by any other fielder in computing earned runs.
(f) Whenever a fielding error occurs, the pitcher shall be given the benefit of the doubt in determining to which bases any runners would have advanced had the fielding of the defensive team been errorless.
(g) When pitchers are changed during an inning, the relief pitcher shall not be charged with any run (earned or unearned) scored by a runner who was on base at the time he entered the game, nor for runs scored by any runner who reaches base on a fielder’s choice which puts out a runner left on base by the preceding pitcher.

The link below offers these rules as well as examples.

Answer 5

Earn Run Average(Runs Times 9 divided by innings pitched = ERA

Answer 6

Earned Run Average

Answer 7

Earned Run Average

Answer 8

ERA stands for Earned Run Average, it measures how many runs a pitcher would give up per nine innings pitched.

You take the number of earned runs, divide by the number of innings pitched then multiply by 9. Simple.

Answer 9

Earned Run Average

Answer 10

In baseball statistics, earned run average (ERA) is the mean of earned runs given up by a pitcher per nine innings pitched. It is determined by multiplying the number of earned runs allowed by nine and dividing by the number of innings pitched. Runners reaching base on errors (even errors by pitchers) do not count toward ERA if they later score.