Assuming you mean square inches:
190mm * 24mm = 4560 mm²
Converting 4560 mm² to in²:
4,560 mm²*1 cm²
100 mm²*1 in²
6.4516 cm²=7.068014136 in²
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The width of a quarter is 24mm ( millimeters)
In UK the 1st class postage stamp measures 24mm high and 20mm across. - as one example Depends on the country, and value.
2.4cm
50mm x 24mm or 54mm x 25mm
Exact is difficult but it is approximately 2.713 cc.