The Greek originals of the following works of Eutocius are preserved: Commentaries on the first four books of the Conics of ApolloniusOn the Sphere and CylinderOn the Quadrature of the CircleOn the Two Books on Equilibrium, of Archimedes.

These commentaries were of ordinary value, as long as geometrical help in understanding the text was required. Torelli wishes that Eutocius had applied himself to all the writings of Archimedes. But they have a merit which will preserve them, independently of their mathematical value; they contain incidentally so much information on the lost writings of Greek geometers, and on the methods of Greek arithmetic, that they are integrant parts of the history of Greek learning. Torelli found them frequently give, by way of citation, a more satisfactory text of Archimedes than that of the remaining mannscripts, which he attributes to the goodness of Isidore's edition: haec causa fuit, cur Archimedem in Eutocii domo conquirerem ubi melius quandoque quam in propria habitabat.