CoordinateBounds

CoordinateBounds[coords] gives a list {{xmin, xmax}, {ymin, ymax}, ...} of the bounds in each dimension of the region defined by coords.

CoordinateBounds[coords, δ] pads the ranges of coordinates by ±δ in each dimension.

CoordinateBounds[coords, Scaled[s]] pads by the scaled amount s in each dimension.

CoordinateBounds[coords, {p1, p2, ...}] pads by p1, p2, ... in successive dimensions.

Examples

Get bounds of a set of points:

CoordinateBounds[{{1, 2}, {3, 4}, {5, 6}}]
(* {{1, 5}, {2, 6}} *)

With padding:

CoordinateBounds[{{0, 0}, {1, 1}}, 0.5]
(* {{-0.5, 1.5}, {-0.5, 1.5}} *)

Please visit the official Wolfram Language Reference for more details.