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Are you trying to measure a person's height as they stand on a scale? My nurse does it with a scale and T-bar mounted on the wall.
English BMI Formula
BMI = ( Weight in Pounds / ( Height in inches x Height in inches ) ) x 703
Metric BMI Formula
BMI = ( Weight in Kilograms / ( Height in Meters x Height in Meters ) )
For precise measurements of body height use measurements in the early morning and in the late afternoon. Body height might vary by 1" due to compression of the spinal bones.
Or you could use an ultrasonic ranging device pointing down at the person's head.
maybe the SRF05 Technical Documentation is a place to start...