This disclosure includes surgical depth gauges and related methods. Some gauges have a probe assembly including a probe having proximal and distal ends, the distal end including one or more prongs, each having a distal-most tip, being movable between a retracted position and a deployed position in which the tip is farther from a longitudinal axis of the probe than when the prong is in the retracted position, and being biased toward the deployed position. Some probe assemblies include a cannula having proximal and distal ends, where the probe is disposable within the cannula such that moving the distal end of the probe toward and away from the distal end of the cannula causes each of the prongs to move between the retracted and deployed positions. Some depth gauges include a sleeve disposable over the probe assembly.
