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| Math Central | Quandaries & Queries |
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Question from philip, a parent: Hi, I would like to know how to convert inches to mm in my head, I use socket sets and want to know an easy way to work out what 3/16, 7/32 is in mm. Thanks Phil |
Hi Phil,
The wrenches measured in millimeters are not exactly the same size as the wrenches measured in inches so the best you can do is an approximation. One conversion factor I carry around in my head is the 2.54 cm = 1 inch. There are 10 millimeters in a centimeter so 25.4 mm = 1 in. If you divide both sides by 32 you get
1/32 in = 25.4/32 = 0.79375 mm
thus
1/32 in is about 0.8 mm.
This may be what you need.
7 × 8 = 56 and hence 7/32 in is approximately 5.6 mm
3/16 = 6/32 and 6 × 8 = 48 so 3/16 in is approximately 4.8 mm.
I hope this helps,
Harley Weston
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