P · 12 seasons · 2005 – 2017 · B/T: L/L
J. P. Howell is 1st of 0 pitchers in career roto value, a top-tier career by any lens the site offers. 2009 was the high-water mark, worth +5.4, 62nd that season and 4910th of 51,303 player-seasons on record. Career value accumulated in ERA (+2.6), WHIP (+0.4) and saves (+0.0), and drained away in strikeouts (-1.0).
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 2005 | KC | 15 | -2.22 | #1,023 | #79,236 |
| 2006 | TB | 8 | -2.08 | #573 | #62,707 |
| 2007★ | TB | 10 | -1.95 | #538 | #49,979 |
| 2008 | TB | 64 | -2.10 | #929 | #65,164 |
| 2009 | TB | 69 | -2.10 | #571 | #64,345 |
| 2011 | TB | 46 | -2.11 | #611 | #65,863 |
| 2012 | TB | 55 | -2.13 | #610 | #68,982 |
| 2013 | LAD | 67 | -2.13 | #967 | #69,366 |
| 2014 | LAD | 68 | -2.07 | #591 | #59,963 |
| 2015 | LAD | 65 | -2.05 | #594 | #57,954 |
| 2016 | LAD | 64 | -2.09 | #1,068 | #63,603 |
| 2017 | TOR | 16 | -2.07 | #594 | #61,375 |
★ Best season by Z
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 2005 | KC | 15 | -2.45 | #472 | #38,387 |
| 2006 | TB | 8 | -1.90 | #396 | #30,369 |
| 2007 | TB | 10 | -3.59 | #637 | #48,796 |
| 2008 | TB | 64 | 4.81 | #75 | #5,735 |
| 2009★ | TB | 69 | 5.38 | #62 | #4,910 |
| 2011 | TB | 46 | -2.22 | #490 | #34,853 |
| 2012 | TB | 55 | -0.24 | #265 | #19,513 |
| 2013 | LAD | 67 | 2.14 | #143 | #11,179 |
| 2014 | LAD | 68 | 0.72 | #200 | #15,625 |
| 2015 | LAD | 65 | 1.40 | #178 | #13,366 |
| 2016 | LAD | 64 | -1.17 | #365 | #24,374 |
| 2017 | TOR | 16 | -2.45 | #605 | #38,426 |
★ Best season by Z