- 1). Use a metric ruler and measure the width, length and height of the boxcar. Write the dimensions down.
- 2). Measure the height of the boxcar wheels. Add the height measurement of the wheels to the height measurement of the boxcar.
- 3). Divide each measurement by 3.55 millimeters and write the answer down.
- 4). The answer derived from dividing each measurement by 3.55 millimeters is the equivalent to the standard measurement of feet in American culture. Write feet behind each answer. Example: An HO box car that is 35.55 millimeters in wide is a model of a 10-foot-wide boxcar.
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