In this study, dimensional changes of vacuum fried bananas were modeled using empirical equations and the Heywood shape factor. The thickness and volume ratio of the fried bananas followed a second order model while the Heywood shape factor of the product initially decreased then increased substantially indicating significant volume expansion. SEM images clearly verify the increase in the pore size of the products due to gas vapor expansion during the frying process. Products ripened for 2 days and fried at 110 C under 8 kPa pressures produced the highest degree of expansion, but sensory evaluations showed that there was no significant difference in the overall acceptability of the product based on the number of ripened days.