Aristotelia calculatrix is a moth of the Gelechiidae family. It was described by Meyrick in 1923. It is found in Brazil (Para, Amazonas). The wingspan is 7-9 mm. The forewings are light greyish-ochreous irregularly irrorated dark fuscous and with an oblique dark fuscous fascia from the costa at one-third not reaching the dorsum, the lower portion forming an angular prominence posteriorly. There is an oblique fascia from the costa at two-thirds reaching two-thirds across the wing, the upper part dark fuscous, the lower ochreous-brown. There is also an inwardly oblique dark fuscous spot on the costa before the apex, edged whitish anteriorly, more or less connected beneath by a dark fuscous dash in the disc with the preceding. The hindwings are rather dark grey.