Striking Reach Calculator

Both start from the same isolated arm length, but the cross adds shoulderWidthCm × 0.55 plus 12 cm, while the jab adds shoulderWidthCm × 0.4 plus 8 cm. The larger multiplier and fixed offset reflect that a rear-hand cross gets extra distance from hip rotation and full shoulder turn into the punch, whereas the lead-hand jab is thrown with less body rotation behind it.

Hook range is 70% of your calculated jab range, and uppercut range is 50% of jab range — both scaled down rather than built up from arm length independently. This models the real biomechanical trade-off where bending the arm for a hook or uppercut sacrifices reach in exchange for the leverage and power those punches generate at closer range.

Front kick range is inseamCm + 25, a fixed hip-extension and lean-back allowance, while roundhouse range is inseamCm × 1.1 + 20 — the 10% multiplier on inseam reflects that a roundhouse travels a wider circular arc with more hip rotation, extending its reach beyond a straight-line kick even though both start from the same leg length.

Reach index is your reach divided by your height — most fighters sit around 1.0, and values above roughly 1.04 indicate unusually long arms relative to height. Ape index is simply reach minus height in centimeters, so a positive number means your wingspan exceeds your height; both are real scouting metrics used because a favorable ratio has historically correlated with a striking-distance advantage in boxing and kickboxing, though technique and footwork still decide who lands.

When your reach exceeds your opponent's (a positive reachAdvantage), the calculator pulls the optimal range inward slightly — jabRange minus 30% of your reach advantage — rather than just reporting raw jab range. This models the idea that the most useful fighting distance for a longer-limbed fighter is a bit closer than their absolute maximum reach: far enough to still land, but positioned to better control the space where a shorter opponent can't yet counter.