Values below a ratio of 9.25 are sea kayaks, abbreviated SK. Ratios between 9.25 and 11.5 are fast sea kayaks, abbreviated FSK. Ratios equal to and above 11.5 are high performance kayaks, abbreviated HPK For this table boats with a ratio below FSK are SK. Boats with dimensions above those listed for HPK are HPK.
The left column is the boat beam in inches. Each FSK/HPK column is a increment to the listed beam.
The values in the body of the table are the waterline length to transition to the next class. So for a 17.0" beam - boats shorter than 13'1.25" are SK, boats from 13'1.25" to 15'6.832" are FSK and boats longer than 16'3.5" are HPK. The same table but in metric is provided below.
| 0 | 0.125 | 0.25 | 0.375 | 0.5 | 0.625 | 0.75 | 0.875 | ||||||||||
| FSK | HPK | FSK | HPK | FSK | HPK | FSK | HPK | FSK | HPK | FSK | HPK | FSK | HPK | FSK | HPK | ||
| 14 | 10'9.500" | 13'5.000" | 10'10.656" | 13'6.438" | 10'11.812" | 13'7.875" | 11'0.969" | 13'9.312" | 11'2.125" | 13'10.750" | 11'3.281" | 14'0.188" | 11'4.438" | 14'1.625" | 11'5.594" | 14'3.062" | |
| 15 | 11'6.750" | 14'4.500" | 11'7.906" | 14'5.938" | 11'9.062" | 14'7.375" | 11'10.219" | 14'8.812" | 11'11.375" | 14'10.250" | 12'0.531" | 14'11.688" | 12'1.688" | 15'1.125" | 12'2.844" | 15'2.562" | |
| 16 | 12'4.000" | 15'4.000" | 12'5.156" | 15'5.438" | 12'6.312" | 15'6.875" | 12'7.469" | 15'8.312" | 12'8.625" | 15'9.750" | 12'9.781" | 15'11.188" | 12'10.938" | 16'0.625" | 13'0.094" | 16'2.062" | |
| 17 | 13'1.250" | 16'3.500" | 13'2.406" | 16'4.938" | 13'3.562" | 16'6.375" | 13'4.719" | 16'7.812" | 13'5.875" | 16'9.250" | 13'7.031" | 16'10.688" | 13'8.188" | 17'0.125" | 13'9.344" | 17'1.562" | |
| 18 | 13'10.500" | 17'3.000" | 13'11.656" | 17'4.438" | 14'0.812" | 17'5.875" | 14'1.969" | 17'7.312" | 14'3.125" | 17'8.750" | 14'4.281" | 17'10.188" | 14'5.438" | 17'11.625" | 14'6.594" | 18'1.062" | |
| 19 | 14'7.750" | 18'2.500" | 14'8.906" | 18'3.938" | 14'10.062" | 18'5.375" | 14'11.219" | 18'6.812" | 15'0.375" | 18'8.250" | 15'1.531" | 18'9.688" | 15'2.688" | 18'11.125" | 15'3.844" | 19'0.562" | |
| 20 | 15'5.000" | 19'2.000" | 15'6.156" | 19'3.438" | 15'7.312" | 19'4.875" | 15'8.469" | 19'6.312" | 15'9.625" | 19'7.750" | 15'10.781" | 19'9.188" | 15'11.938" | 19'10.625" | 16'1.094" | 20'0.062" | |
| 21 | 16'2.250" | 20'1.500" | 16'3.406" | 20'2.938" | 16'4.562" | 20'4.375" | 16'5.719" | 20'5.812" | 16'6.875" | 20'7.250" | 16'8.031" | 20'8.688" | 16'9.188" | 20'10.125" | 16'10.344" | 20'11.562" | |
| 22 | 16'11.500" | 21'1.000" | 17'0.656" | 21'2.438" | 17'1.812" | 21'3.875" | 17'2.969" | 21'5.312" | 17'4.125" | 21'6.750" | 17'5.281" | 21'8.188" | 17'6.438" | 21'9.625" | 17'7.594" | 21'11.062" | |
| 23 | 17'8.750" | 22'0.500" | 17'9.906" | 22'1.938" | 17'11.062" | 22'3.375" | 18'0.219" | 22'4.812" | 18'1.375" | 22'6.250" | 18'2.531" | 22'7.688" | 18'3.688" | 22'9.125" | 18'4.844" | 22'10.562" | |
| 24 | 18'6.000" | 23'0.000" | 18'7.156" | 23'1.438" | 18'8.312" | 23'2.875" | 18'9.469" | 23'4.312" | 18'10.625" | 23'5.750" | 18'11.781" | 23'7.188" | 19'0.938" | 23'8.625" | 19'2.094" | 23'10.062" | |
| 25 | 19'3.250" | 23'11.500" | 19'4.406" | 24'0.938" | 19'5.562" | 24'2.375" | 19'6.719" | 24'3.812" | 19'7.875" | 24'5.250" | 19'9.031" | 24'6.688" | 19'10.188" | 24'8.125" | 19'11.344" | 24'9.562" | |
| 26 | 20'0.500" | 24'11.000" | 20'1.656" | 25'0.438" | 20'2.812" | 25'1.875" | 20'3.969" | 25'3.312" | 20'5.125" | 25'4.750" | 20'6.281" | 25'6.188" | 20'7.438" | 25'7.625" | 20'8.594" | 25'9.062" | |
| 0 | 0.25 | 0.5 | 0.75 | ||||||
| FSK | HPK | FSK | HPK | FSK | HPK | FSK | HPK | ||
| 35 | 323.750 | 402.500 | 326.062 | 405.375 | 328.375 | 408.250 | 330.688 | 411.125 | |
| 36 | 333.000 | 414.000 | 335.312 | 416.875 | 337.625 | 419.750 | 339.938 | 422.625 | |
| 37 | 342.250 | 425.500 | 344.562 | 428.375 | 346.875 | 431.250 | 349.188 | 434.125 | |
| 38 | 351.500 | 437.000 | 353.812 | 439.875 | 356.125 | 442.750 | 358.438 | 445.625 | |
| 39 | 360.750 | 448.500 | 363.062 | 451.375 | 365.375 | 454.250 | 367.688 | 457.125 | |
| 40 | 370.000 | 460.000 | 372.312 | 462.875 | 374.625 | 465.750 | 376.938 | 468.625 | |
| 41 | 379.250 | 471.500 | 381.562 | 474.375 | 383.875 | 477.250 | 386.188 | 480.125 | |
| 42 | 388.500 | 483.000 | 390.812 | 485.875 | 393.125 | 488.750 | 395.438 | 491.625 | |
| 43 | 397.750 | 494.500 | 400.062 | 497.375 | 402.375 | 500.250 | 404.688 | 503.125 | |
| 44 | 407.000 | 506.000 | 409.312 | 508.875 | 411.625 | 511.750 | 413.938 | 514.625 | |
| 45 | 416.250 | 517.500 | 418.562 | 520.375 | 420.875 | 523.250 | 423.188 | 526.125 | |
| 46 | 425.500 | 529.000 | 427.812 | 531.875 | 430.125 | 534.750 | 432.438 | 537.625 | |
| 47 | 434.750 | 540.500 | 437.062 | 543.375 | 439.375 | 546.250 | 441.688 | 549.125 | |
| 48 | 444.000 | 552.000 | 446.312 | 554.875 | 448.625 | 557.750 | 450.938 | 560.625 | |
| 49 | 453.250 | 563.500 | 455.562 | 566.375 | 457.875 | 569.250 | 460.188 | 572.125 | |
| 50 | 462.500 | 575.000 | 464.812 | 577.875 | 467.125 | 580.750 | 469.438 | 583.625 | |
| 51 | 471.750 | 586.500 | 474.062 | 589.375 | 476.375 | 592.250 | 478.688 | 595.125 | |
| 52 | 481.000 | 598.000 | 483.312 | 600.875 | 485.625 | 603.750 | 487.938 | 606.625 | |
| 53 | 490.250 | 609.500 | 492.562 | 612.375 | 494.875 | 615.250 | 497.188 | 618.125 | |
| 54 | 499.500 | 621.000 | 501.812 | 623.875 | 504.125 | 626.750 | 506.438 | 629.625 | |
| 55 | 508.750 | 632.500 | 511.062 | 635.375 | 513.375 | 638.250 | 515.688 | 641.125 | |
| 56 | 518.000 | 644.000 | 520.312 | 646.875 | 522.625 | 649.750 | 524.938 | 652.625 | |
| 57 | 527.250 | 655.500 | 529.562 | 658.375 | 531.875 | 661.250 | 534.188 | 664.125 | |
| 58 | 536.500 | 667.000 | 538.812 | 669.875 | 541.125 | 672.750 | 543.438 | 675.625 | |
| 59 | 545.750 | 678.500 | 548.062 | 681.375 | 550.375 | 684.250 | 552.688 | 687.125 | |
| 60 | 555.000 | 690.000 | 557.312 | 692.875 | 559.625 | 695.750 | 561.938 | 698.625 | |
| 61 | 564.250 | 701.500 | 566.562 | 704.375 | 568.875 | 707.250 | 571.188 | 710.125 | |
| 62 | 573.500 | 713.000 | 575.812 | 715.875 | 578.125 | 718.750 | 580.438 | 721.625 | |
| 63 | 582.750 | 724.500 | 585.062 | 727.375 | 587.375 | 730.250 | 589.688 | 733.125 | |
| 64 | 592.000 | 736.000 | 594.312 | 738.875 | 596.625 | 741.750 | 598.938 | 744.625 | |
| 65 | 601.250 | 747.500 | 603.562 | 750.375 | 605.875 | 753.250 | 608.188 | 756.125 | |
| 66 | 610.500 | 759.000 | 612.812 | 761.875 | 615.125 | 764.750 | 617.438 | 767.625 | |
| 67 | 619.750 | 770.500 | 622.062 | 773.375 | 624.375 | 776.250 | 626.688 | 779.125 | |
| 68 | 629.000 | 782.000 | 631.312 | 784.875 | 633.625 | 787.750 | 635.938 | 790.625 | |
| 69 | 638.250 | 793.500 | 640.562 | 796.375 | 642.875 | 799.250 | 645.188 | 802.125 | |