You cannot "calculate" the front of a box. You can calculate its dmensions, or its area but calculating it does not make sense.
As for calculating its size or area, the answer will depend on what information you have and what you require.
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multiply the height by the width
If it's just the front surface of a box then it's simply a 2D shape, the area can be calculated by multiplying the length by the width. Answer will be in units squared.
You measure the sides, and multiply the top and side.
height x length
No. If you want the area of a single surface of a box, simply multiply the height by the width of the surface of interest.