Kayak Fishing Setup Calculator

Fishing kayaks are especially sensitive to overloading because anglers stand, lean, and cast — all of which raise or shift the center of gravity in ways that ordinary paddling doesn't. This calculator adds up your paddler weight, fishing gear, tackle and accessories, and expected catch weight into a total load, then expresses that as a percentage of your kayak's manufacturer-rated capacity. The stability rating climbs steadily as load rises from empty toward 60% of capacity, topping out at a perfect 100 right at that 60% mark — the point where the hull sits deep enough to resist tipping but hasn't started dragging. From 60% up to 75% the rating holds flat at 95, a wide comfortable margin that's still excellent even though it's a hair below that 60% peak; past 75% it declines, and loads beyond 85% score sharply worse as the hull nears its limit.

In practice this means the single best-scoring load is right around 60% capacity, with the 60-75% band representing "still very good" rather than "best." A separate paddling-efficiency penalty kicks in once total load crosses 70% of capacity, modeling the real drag increase from riding low in the water — this is deliberately a different threshold than the stability curve, so a kayak can be stability-rated well but already losing speed. The draft-increase figure (how much deeper the hull sits) is a rough linear estimate — roughly 0.15 inches deeper for every 10 pounds added — not a hull-specific hydrostatics calculation, since actual draft depends heavily on hull shape. The gear-budget figure tells you how many more pounds you can add and still land at the recommended 75% capacity ceiling, which is the single most actionable number here for deciding whether that extra cooler or second rod fits your safety margin.