This project explored a newly developed computer-based voice input, speech output (VISO) calculator. Three high school students with visual impairments educated at a state school for the blind and visually impaired participated in the study. The time they took to complete assessments and the average number of attempts per problem were recorded when they used the VISO calculator and their typical individualized method of calculation. The results indicated that the time to complete assessments and the average number of attempts per problem decreased as the students continued to use the VISO calculator. Students reported positive perceptions of the calculator, particularly noting the independence it provided as compared to their typical means of calculation. Implications for practice, limitations of the study, and future research directions are discussed. (Contains 1 figure.)