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Reach is measured fingertip to fingertip with arms extended horizontally. A positive differential means longer striking range at equal stance.
Reach advantage = Fighter A reach − Fighter B reachPositive ape index (wingspan exceeds height) correlates with reach advantage in striking arts. Average ape index is near zero; +5 cm or more is notable.
Ape index = Wingspan − HeightEffective punching range is roughly half wingspan plus shoulder width. Leg reach (inseam measurement) separately affects kicking range in MMA.
Jab range ≈ Reach ÷ 2 + shoulder widthUpdated: July 2026
A 74-inch reach fighter against a 70-inch opponent has significant jab range advantage. The shorter fighter must invest in head movement and inside fighting.
Scouting report shows 78-inch wingspan at 72-inch height (ape index +6 inches) — a physical trait favoring counter-striking at distance.
A tall-limbed teenager with +8 cm ape index may naturally suit boxing or kickboxing where reach translates directly to competitive advantage.
Reach and wingspan significantly affect striking range in boxing and MMA. Enter two fighters' arm span and height measurements to calculate reach differential, ape index, and strategic implications for distance management in a matchup.