Once height and weight are entered, this handy calculator automatically calculates the BMI. This BMI Calculator can also be used as a normal pocket calculator. It has all four basic calculation functions and an eight-digit display. Energy is provided by a solar cell and a battery in case there is insufficient light in the room to allow solar-powered operation. The SECA BMI Calculator is also indispensable in residential care, as it is recommended that care documentation should include a record of BMI. For adult BMI calculations only.