Compute the ERA ratio between a pitcher's ERA and league average ERA and assign a base grade:
| Grade | ERA ratio |
|---|---|
| A&B | less than 0.25 |
| A&C | 0.25-0.40 |
| A | 0.40-0.72 |
| B | 0.72-0.80 |
| C | 0.80-1.00 |
| D | more than 1.00 |
If a pitcher has made a start, he gets a starting grade. I reduce the starting grade once if there are fewer than 28 starts; twice if there are fewer than 6.
If a pitcher has more than 10 relief appearances or if he has at least as many relief appearances as starts, he gets a relief grade. If a pitcher's IP is under 55, the pitcher's relief grade is reduced once. If it's under 25, the relief grade is reduced twice.
The strikeout rating is determined by the ratio of K/9 to the league K/9:
| Strikeout Rating | K ratio |
|---|---|
| KXY | more than 2.20 |
| KX | 2.00 - 2.20 |
| KY | 1.90 - 2.00 |
| K | 1.66 - 1.90 |
| XY | 1.40 - 1.66 |
| X | 1.17 - 1.40 |
| Y | 0.92 - 1.17 |
The walk rating is determined by the ratio of BB/9 to the league BB/9:
| Walk Rating | BB ratio |
|---|---|
| ZZ | less than 0.30 |
| Z | 0.30-0.83 |
| W | more than 1.26 |
Future considerations: