The following chart can be used to find the right size of Spade anchor for your application. Unlike other manufacturers, Spade's sizing chart is accurate and includes a margin of safety. These sizings are accurate for use as a "storm anchor" on a typical monohull.
When sizing an anchor choose the model that corresponds the largest required for either the length or weight. For multihulls, choose 1 size larger than recommended in the table (think windage).
| Boat Length | Max Boat Weight | Anchor Model | Weight: Galvanized & Stainless | Weight: Aluminum |
| 21 ft. | 2200 lbs. | 40 | 12 lbs. | 6 lbs. |
| 24 ft. | 4850 lbs. | 60 | 21 lbs. | 10 lbs. |
| 34 ft. | 9920 lbs. | 80 | -- | 15 lbs. |
| 41 ft. | 14330 lbs. | 80 | 33 lbs. | -- |
| 52 ft. | 26450 lbs. | 100 | 44 lbs. | 26 lbs. |
| 59 ft. | 35270 lbs. | 120 | 55 lbs. | -- |
| 65 ft. | 44000 lbs. | 140 | 66 lbs. | 41 lbs. |
| 75 ft. | 50700 lbs. | 160 | 77 lbs. | -- |
| 75 ft. | 57300 lbs. | 180 | 99 lbs. | -- |
| 82 ft. | 66130 lbs. | 200 | 121 lbs. | 57 lbs. |
| 98 ft. | 88100 lbs. | 240 | 165 lbs. | -- |
| 99 ft. & Over | 330900 lbs. | 380 | 243 lbs. | -- |
*Custom sizes are available for larger applications