Convert mm to inches - easy to remember!!
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 15th July 2019, 05:42 PM #1 takitaj   diyAudio Member   Join Date: Apr 2012 Location: Maine Convert mm to inches - easy to remember!! Back in my engineering days I learned an easy and accurate enough way to convert from millimeters or centimeters to inches and back. I thought I would share it with the forums. Some may already know but for those that don't it's one easy number to remember. The magic number is 0.03937 (actual number is 0.03937007874) Convert millimeters to inches, multiply -> mm x 0.03937 = inches Convert inches to millimeters, divide -> inches / 0.03937 = mm To convert to or from centimeters simply move it over one decimal place -> cm x 0.3937 = inches and of course the inverse is the same -> inches / 0.3937 = cm Have fun! TJ Last edited by takitaj; 15th July 2019 at 07:24 PM. Reason: add slight correction
 15th July 2019, 05:47 PM #2 leadbelly   diyAudio Member     Join Date: Dec 2002 Location: Calgary, Alberta Er, thanks? __________________ Don't try to be a great man ... just be a man. Let history make its own judgments. Zefram Cochrane
Galu
diyAudio Member

Join Date: Apr 2018
Quote:
 Originally Posted by takitaj . . .it's one easy number to remember. The magic number is 0.03937
Thanks, but at my age I'm struggling to remember my PIN numbers!

 15th July 2019, 06:04 PM #4 hudelson2   diyAudio Member   Join Date: Aug 2007 Location: Irving, Texas An exact formula to convert millimeters to inches is to divide by 25.4. There are exactly 25.4 millimeters to an inch. Instead of working in inches, why not simply buy a tape measure with metric units? You can buy them at Amazon. John
scottjoplin
diyAudio Member

Join Date: Dec 2015
Location: Penrhyndeudraeth
Quote:
 Originally Posted by takitaj The magic number is 0.03937
No it's not, it's 0.03937007874

analog_sa
diyAudio Member

Join Date: Aug 2002
Location: Cascais
Quote:
 Originally Posted by takitaj Have fun!

Wow! You won't believe the fun i am having. Cannot stop myself converting.

 15th July 2019, 06:24 PM #7 takitaj   diyAudio Member   Join Date: Apr 2012 Location: Maine I have the means to measure both, thank you. Just thought I'd share for others that might be interested. As you know, in the USA we generally still use inches. For me, 0.03937 (actual number is 0.03937007874) stuck better than 25.4, for whatever reason. We're all wired differently. I put it out there, do with it as you wish. Thanks for your feedback! TJ
 15th July 2019, 06:28 PM #8 scottjoplin   diyAudio Member     Join Date: Dec 2015 Location: Penrhyndeudraeth Not meaning to be pedantic (of course I am) but you said easy and accurate..........
 15th July 2019, 06:40 PM #9 takitaj   diyAudio Member   Join Date: Apr 2012 Location: Maine Accurate enough for anything anyone here would use it for! What's 0.00000007874 inches between friends? TJ
diyAudio Member

Join Date: Sep 2003
Location: Ashland, MA
Quote:
 Originally Posted by takitaj Accurate enough for anything anyone here would use it for! What's 0.00000007874 inches between friends? TJ
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