The Power Meter (K.O.ゲージ, K.O. Gauge) is a special mechanic used by Little Mac in Super Smash Bros. 4, shown above his damage meter. It can be filled if Little Mac takes or deals damage. Once the bar is full, the bar becomes a flashing "K.O." sign, causing his neutral special move, the Straight Lunge, to be replaced with a powerful uppercut with the potential for a one-hit KO.

The meter is emptied when the one-hit KO move version is used, successfully or not. The meter will also be emptied if Little Mac is KO'd.

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