Stand-Up Paddleboard Size Calculator

Total weight feeds directly into the volume formula — the calculator adds your entered gear weight to your body weight before converting to kilograms and multiplying by the skill-based factor, so 10 extra lbs of gear raises recommended volume by the same amount as 10 extra lbs of body weight would. This matters most for touring and expedition-style paddling, where dry bags and coolers add real, buoyancy-relevant weight.

The calculator applies a fixed use-based adjustment on top of the weight-derived midpoint volume: +15L for touring (to carry overnight gear and maintain glide when loaded), +5L for racing, +10L for yoga/fitness (extra stability margin), and -10L for surfing, since a lower-volume board sits lower in the water and turns more responsively on a wave face. These are additive offsets, not multipliers, so their effect is proportionally larger on a lighter paddler's smaller base volume.

Each activity has a length range (for example 10-11 ft for all-around), and the calculator positions you within that range based on a weight factor that scales linearly from 120 lbs (bottom of the range) to 300 lbs (top of the range). Heavier paddlers need more waterline length to maintain glide efficiency and displacement, so a 250 lb all-around paddler and a 130 lb all-around paddler land at different points in that same 10-11 ft window.

It's set at 1.5 times your combined paddler-plus-gear weight, which is a stability margin rather than a hard limit — a board loaded near its rated maximum capacity sits lower and feels tippier, so buying to this 1.5x threshold gives you buoyancy in reserve rather than running the board at its edge.