| Slate size | Pieces per square | Exposure |
| Inches | at 3″ headlap | at 3″ headlap |
| 24 x 12 | 115 | 10.5″ |
| 22 x 12 | 126 | 9.5″ |
| 22 x 11 | 137 | 9.5″ |
| 20 x 14 | 121 | 8.5″ |
| 20 x 12 | 141 | 8.5″ |
| 20 x 11 | 154 | 8.5″ |
| 20 x 10 | 170 | 8.5″ |
| 18 x 14 | 137 | 7.5″ |
| 18 x 12 | 160 | 7.5″ |
| 18 x 11 | 175 | 7.5″ |
| 18 x 10 | 192 | 7.5″ |
| 18 x 9 | 213 | 7.5″ |
| 16 x 14 | 158 | 6.5″ |
| 16 x 12 | 185 | 6.5″ |
| 16 x 11 | 201 | 6.5″ |
| 16 x 10 | 222 | 6.5″ |
| 16 x 9 | 246 | 6.5″ |
| 16 x 8 | 277 | 6.5″ |
| 14 x 12 | 218 | 5.5″ |
| 14 x 11 | 238 | 5.5″ |
| 14 x 10 | 262 | 5.5″ |
| 14 x 9 | 291 | 5.5″ |
| 14 x 8 | 327 | 5.5″ |
| 14 x 7 | 374 | 5.5″ |
| 12 x 10 | 320 | 4.5″ |
| 12 x 8 | 400 | 4.5″ |
| 12 x 6 | 534 | 4.5″ |
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