Disc Stability Calculator

Turn and fade live on different scales for every brand. This collapses them into one normalized stability number so you can compare any two discs on the same axis.

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or enter flight numbers manually

Speed Glide Turn Fade

How the number works: normalized stability = turn + fade. Understable discs have negative turn that pulls the number down; fade pulls it up. The result lands roughly on a −4 (very understable) to +5 (very overstable) scale, with 0 being dead straight. It's a quick cross-brand proxy — speed, glide, and how beat-in a disc is all still affect real flight.