The conversion factor is 25.4mm per inch.
so, multiply your inch dimension by 25.4 and that is your answer in millimeters.
-----> 3.75 inches x 25.4 = 95.25mm
-----> 7 inches x 25.4 = 177.8mm
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compare it with cm .....mm x 10 cm
To find 76 mm on a tape measure, first locate the metric side of the tape, which is usually marked with millimeters (mm). Count 76 small lines from the zero mark; each line represents 1 mm. Alternatively, if the tape also shows centimeters (cm), you can find 7.6 cm, as there are 10 mm in each cm.
Are you sure it won't strain your brain?
You find a tape measure and take the measurement across the door, then the length of it, then if necessary the thickness.
The answer depends on the tape measure. It is quite likely it is 375 centimetres = 3.75 metres, but it is not possible to be sure.