None. An inch is a measure of distance while a square inch is a measure of area. The two measure different things and according to basic dimensional analysis conversion from one to the other is not a valid operation.
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315 millimeters=12.4015748 inches
Approximately 315 inches.
315 millimeters (mm) = 12.4 inches (1 inch = 25.4 millimeters)
315
Approx 29.3 square metres.