While many methods exist, a simple and accurate way is to measure your torso.

Sit up straight on a flat surface and measure from the surface in between your legs to your nose. Follow the chart below:

Torso Size Straight Canoe Paddle Size Bent Canoe Paddle Size
20" Youth 36 n/a
22" Youth 42 n/a
24" Youth 48 n/a
26" 51 or 52 48
28" 54 50
30" 56 or 57 52
32" 57 or 58 54
34" 60 56
36" 62 n/a
38" 64 n/a

An easy way to measure in the field is to place the grip of the paddle between your legs (while sitting) and mark where the shoulder is (where blade meets shaft). The shoulder on a straight shaft should be at your forehead; the shoulder on a bent shaft should be at your nose.

Note: this is only a guideline to sizing. Seat height, style of paddling, and arm length can all effect the size you need. Demo paddling is always recommended.