| Rule-of-Thumb Fillet Weld Sizes |
| Plate Thickness (t) | Strength Design | Rigidity Design | |
| Full Strength Weld (ω = 3/4 t) | 50% of Full Strength Weld (ω = 3/8 t) | 33% of Full Strength Weld (ω = 1/4 t) | |
| 1/4 | 3/16 | 3/16* | 3/16* |
| 5/16 | 1/4 | 3/16* | 3/16* |
| 3/8 | 5/16 | 3/16* | 3/16* |
| 7/16 | 3/8 | 3/16 | 3/16* |
| 1/2 | 3/8 | 3/16 | 3/16* |
| 9/16 | 7/16 | 1/4 | 1/4* |
| 5/8 | 1/2 | 1/4 | 1/4* |
| 3/4 | 9/16 | 5/16 | 1/4* |
| 7/8 | 5/8 | 3/8 | 5/16* |
| 1 | 3/4 | 3/8 | 5/16* |
| 1 1/8 | 7/8 | 7/16 | 5/16 |
| 1 1/4 | 1 | 1/2 | 5/16 |
| 1 3/8 | 1 | 1/2 | 3/8 |
| 1 1/2 | 1 1/8 | 9/16 | 3/8 |
| 1 5/8 | 1 1/4 | 5/8 | 7/16 |
| 1 3/4 | 1 3/8 | 3/4 | 7/16 |
| 2 | 1 1/2 | 3/4 | 1/2 |
| 2 1/8 | 1 5/8 | 7/8 | 9/16 |
| 2 1/4 | 1 3/4 | 7/8 | 9/16 |
| 2 3/8 | 1 3/4 | 1 | 5/8 |
| 2 1/2 | 1 7/8 | 1 | 5/8 |
| 2 5/8 | 2 | 1 | 3/4 |
| 2 3/4 | 2 | 1 | 3/4 |
| 3 | 2 1/4 | 1 1/8 | 3/4 |