What is reach in boxing?

Reach is the distance from fingertip to fingertip with both arms stretched horizontally, essentially the boxer's arm span. A longer reach lets a fighter land jabs and straight punches from a safer distance than a shorter opponent.

What is the ape index?

The ape index is reach minus height. A positive value means a boxer's arms are longer than they are tall, which is a sought-after trait. Many elite boxers have an ape index of several centimetres, giving them range beyond their height.

Does a reach advantage guarantee a win?

No. Reach is one factor among many. A longer fighter who keeps distance and jabs can dominate, but a shorter, busier fighter who slips inside and works the body can neutralise reach entirely, as boxing history repeatedly shows.

How big a reach gap matters?

A difference under about an inch is negligible. From one to four inches gives a noticeable but workable edge, and beyond four inches the shorter boxer faces a serious range problem that demands pressure and infighting to overcome.

What is reach-to-height ratio used for?

The reach-to-height ratio normalises reach against stature so you can compare wingspans between boxers of different heights. A ratio above one means proportionally long arms; it complements the absolute reach differential.

Boxing Reach Advantage Calculator

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Reach is one of the first numbers commentators quote before a fight, because range dictates how a bout is fought. This calculator compares two boxers’ heights and reaches to show who controls distance and what that mismatch means in the ring.

How it works

From each boxer’s height and reach the tool computes three figures:

reach differential   = reach A − reach B
ape index            = reach − height        (per boxer)
reach-to-height ratio = reach / height       (per boxer)

A positive reach differential means Boxer A is longer. A positive ape index means a boxer’s arms are longer than they are tall — a genuine asset. The tool converts the gap to inches to classify it as even, modest, or large and gives the matching tactical note.

Tips and notes

Treat reach as a tendency, not a verdict. A long boxer should live behind the jab and keep the fight at range; a shorter one must close distance, cut the ring off, and trade on the inside where long arms lose leverage. Many great fighters won from the short side by making the taller opponent uncomfortable up close. Use the ape index to spot fighters who punch above their height — long arms on a compact frame are a recurring trait among champions.