Abstract: A pocket calculator holder for selectively detachably securing the holder to a waist belt of a user or to a shoulder strap provides for the use of a holder body having a closed bottom, closed sides and an open top. The holder body is secured to the shoulder strap or to a wearer's belt through the use of a pair of spaced-apart strips attached to the back portion of the holder body. One of the ends of the strips is securedly attached to the back portion of the holder body, while the second end is provided with a fastener element to fasten with a co-aligned mating fastener element attached to the back portion of the holder body. The second embodiment provides for the use of a pair of spaced apart strips mounted on an underside of a flap which is securedly attached to a back portion of the holder body. The strips on the underside of the flap form loops with the underside of the flap for receiving a shoulder strap therein.