Canon Office Products LS-555H Business Calculator
This little calculator folds up for easy portability and protection of the keypad and screen. Among the smallest and lightest picks on our list, this compact unit from Canon shifts between solar and battery power sources and comes with an OFF button to conserve energy. The LCD display is nice and large, with bold, easily read numbers; but the keys are about the size of a fingertip, so it may not be well suited for all consumers. However, if you're looking for an easy little calculator that performs all of the necessary mathematical functions on the go, the LS-555H is for you.