Rigging Bench · Field Tool

Speargun Powerband Size Calculator

Cut your latex to length for a clean, repeatable draw. Enter your measured band route and pick your tubing.

Swipe the diagram — or tap it to zoom

Shaft loaded, band stretched: measure D from the muzzle band anchor back to the loading notch, following the band’s path — not the barrel. Measure all the way to the notch; the wishbone at the end of that run isn’t latex, which is what the formula subtracts as W.

With the shaft loaded, measure from the muzzle band anchor to the loading notch, along the band’s path.

Relative power
2.83.33.8
6810

Built by Fishes One Hook — spearfishing gear & technique.