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Asteroids can reach as large as Ceres, which is 940 km (about 583 miles) across. On the other hand, one of the smallest, discovered in 1991 and named 1991 BA, is only about 20 feet (6 meters) across. Nearly all asteroids are irregularly shaped, although a few are nearly spherical, such as Ceres.
How does the total mass of all asteroids compare to the mass of a terrestrial world? The largest; Ceres is a little less than a third the diameter of our room. Can be considered a dwarf planet. The total mass of all asteroids does not compare to the mass of a terrestrial world...much smaller.