Convert from block [East U.S.] to stride [great]

Unit Definition (block [East U.S.])
The Block is an informal unit of distance popular in the U.S. A block is the average distance between street intersections in the rectangular street grids common in most American cities. The length of a block in Eastern USA is about 1/20 mile or 80 meters.

Unit Definition (stride [great])
Distance between consecutive prints of the same foot in a track, measured from the same point on each foot.