A pitching line of 5.2 means five innings and two thirds, equivalent to 17 outs. Convert innings pitched to outs before adding contributions and convert the total back after the addition.
Translate the display into one unit
MLB’s glossary relates innings pitched to recorded outs. Three outs make an inning and one out contributes one third. The official scoring rules provide the fuller statistical framework. For this worked conversion, an IP display has a whole-inning part and a remaining-out part.
Start with 5.2. Five groups of three outs give 15, and the final two give 17. A display of 5.1 is 16 outs. The difference between those two lines is one out. Keep the word outs beside the result when transferring it into a spreadsheet or written calculation.
Add two pitching contributions
| Contribution | Out calculation | Outs |
|---|---|---|
| First pitcher, 5.2 | 5×3+2 | 17 |
| Next pitcher, 1.1 | 1×3+1 | 4 |
| Combined | 17+4 | 21, displayed as 7.0 IP |
Carry three remaining outs into a full inning
Ordinary decimal addition would turn 5.2+1.1 into 6.3. The remaining two plus one outs form another full inning, so the resolved combined amount is 7.0. Working through 21 outs makes the carry visible and avoids relying on a memorised exception.
Another example is 0.2+0.2. Two outs plus two outs equals four outs, so the combined notation is 1.1. A true decimal value can be useful for calculations that expect a decimal fraction, but it needs an explicit conversion and a clearly different column label. A column that stores raw outs avoids rounding before addition.
Use the statistic for the right measurement
Seventeen outs describes statistical credit. The pitch count, real minutes on the field and time remaining in the broadcast each have a different measurement. For the combined IP, convert each displayed contribution to outs, sum the outs, then divide by three.
The quotient supplies the whole innings and the remainder supplies the final 0, 1 or 2. That method also makes a data-entry error easier to find. A remaining-out column of 3 has yet to be carried into a whole inning. For an official result, start with the published pitching line, especially if a short clip leaves the credited outs unclear. The worked arithmetic converts that accepted line into a consistent unit. If the combined line contains 26 outs, eight complete innings account for 24 of them. The two remaining outs give 8.2 IP. Keep 26 in the working column if you need to add another pitcher’s outs later.
Sources and review
- Innings Pitched — Glossary — Major League Baseball
- Official Baseball Rules —2026 Edition — Office of the Commissioner of Baseball