Cumulative number of innings (including fractional innings) pitched by a pitcher.

Innings Pitched is the number of innings a pitcher plays in a game. Because there are three outs in an innings, innings are divided into thirds. A pitcher who pitches just one out (one third of an inning) is described as having pitched "0.1" innings. Innings Pitched is often abbreviated as 'IP'. In the Box Score, IP refers to the innings pitched in that one game. In the Pitching Dialog, the IP column shows inning totals for an entire season or career.

The number of innings pitched with decimals for added accuracy. A pitcher with 3.1 innings pitched had three full innings of work then retired one batter in his fourth inning of work. IPS