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View hokieman's profile

Millimeters to Fractional Inches Conversion

by hokieman
posted 09-30-2017 10:22 PM


41 replies so far

View corelz125's profile

corelz125

3731 posts in 2219 days


#1 posted 09-30-2017 11:15 PM

I use an app on my phone for conversions. Its called handyman calculator by kalyani also has a ton of other features for measurements

View Madmark2's profile

Madmark2

3096 posts in 1831 days


#2 posted 09-30-2017 11:37 PM

35mm Cup centers @ 13/16 & use a self center #8 drill pilot for the screw hole.

M

-- The hump with the stump and the pump!

View Andybb's profile

Andybb

3330 posts in 1846 days


#3 posted 10-01-2017 12:11 AM

Thanks. I will check out the app but as handy as my phone apps are, when I’m in the shop these are much faster for me. I just put them in a plastic sleeve attached by a string to hang on the side of my bench and router table respectively. I always know where they are. Low tech in 1/64ths”.

My other trick for stuff less than 6 inches is to use my calipers and and let it do the conversion for me.

————————————————————————————————————————————————————————

I like this one also.

-- Andy - Seattle USA

View Woodknack's profile

Woodknack

13584 posts in 3623 days


#4 posted 10-01-2017 02:58 AM

Seems like it would be easier to buy a metric rule than constantly converting. I have rules and tapes in inches, metric, and tenths of an inch; they all come in handy. Earlier my daughter needed a bunch of stuff cut and the parts list was in tenths, 1.83”, 1.71”, etc. No trouble at all.

-- Rick M, http://thewoodknack.blogspot.com/

View WoodES's profile

WoodES

198 posts in 2934 days


#5 posted 10-01-2017 03:15 AM

Type mm into Google, a conversion website will be the result.

View 000's profile

000

2859 posts in 2142 days


#6 posted 10-01-2017 03:39 AM

I just use 25.4 and divide or multiply depending on which I’m converting.
I always have my phone with me anyway, so nothing else to carry around or find. Just pull it out and use the calculator app.

View AlaskaGuy's profile

AlaskaGuy

6748 posts in 3552 days


#7 posted 10-01-2017 03:49 AM

The instructions that came with my Blum under mount drawer slides had both MM and imperial measurement right on the instruction. No conversion necessary.

I do have metric tapes and steel rules and my calipers read both MM and imperial. I can convert either way with a touch of a button.

-- Alaskan's for Global warming!

View Andybb's profile

Andybb

3330 posts in 1846 days


#8 posted 10-01-2017 05:33 AM


Seems like it would be easier to buy a metric rule than constantly converting. I have rules and tapes in inches, metric, and tenths of an inch; they all come in handy. Earlier my daughter needed a bunch of stuff cut and the parts list was in tenths, 1.83”, 1.71”, etc. No trouble at all.

- Rick_M


Apologies to the OP for the hijack. I have an architects rule that I haven’t used in 30 years and I was a chemistry major so have no problem with the math or conversions. My issue is that I am a 60 year old American curmudgeon and my brain is calibrated to imperial. If you tell me it’s 37C outside I have no reference but I know what 98F feels like. My table saw fence is in inches, my router lift is in inches as well as almost everything else I measure or cut with so I convert back to inches most of the time. Lumber stores here are starting to measure thicknesses in mm so I do know that 3mm plywood fits in an 1/8th inch groove.

I remember back in the 70’s we were going to switch to metric and were ready to bite the bullet but unfortunately it just never happened.

Then there’s the Brits. A boxer weighs 12 stone 4 at the weigh in? WTF is that?! :-) Is a lid still 3 fingers?

-- Andy - Seattle USA

View robscastle's profile

robscastle

8266 posts in 3447 days


#9 posted 10-01-2017 08:30 AM

Blum drawer slides and soft close hinges

-- Regards Rob

View AlaskaGuy's profile

AlaskaGuy

6748 posts in 3552 days


#10 posted 10-01-2017 08:39 AM

I never said a word about Blum Hinges. In fact nobody has except very brief mention by the OP

-- Alaskan's for Global warming!

View Fred Hargis's profile

Fred Hargis

7229 posts in 3736 days


#11 posted 10-01-2017 02:36 PM


Maybe one day the US will convert to metric but I doubt it.

- hokieman

Unfortunate, but so true…...we really, really hate change (apparently).

-- Our village hasn't lost it's idiot, he was elected to congress.

View Markmh1's profile

Markmh1

115 posts in 1686 days


#12 posted 10-04-2017 01:10 PM

I’ve always used .03937 as a multiplier.

A millimeter is .03937 inches. Punch MM’s into your calculator, multiply, and you’re done. Remember fractional inches are just a division problem. 13/16 is 13 divided by 16= .8125. .8125 divided by .03937 = 20.67 MM.

If you want to figure in your head and get ballpark, just use 40 thousandths.

We went to the moon in inches.

Mark

View Woodknack's profile

Woodknack

13584 posts in 3623 days


#13 posted 10-04-2017 03:58 PM

If I want to convert units, I pick up my phone and say, “Google, convert X to Y.” And it spits out an answer quicker than I can open an app or reference chart. I carry it everywhere I go, might as well put the tech to work.

-- Rick M, http://thewoodknack.blogspot.com/

View AlaskaGuy's profile

AlaskaGuy

6748 posts in 3552 days


#14 posted 10-04-2017 05:32 PM



If I want to convert units, I pick up my phone and say, “Google, convert X to Y.” And it spits out an answer quicker than I can open an app or reference chart. I carry it everywhere I go, might as well put the tech to work.

- Rick_M

What you going to do when the network is down or the battery gives up or you drop it in the toilet?

-- Alaskan's for Global warming!

View Bohaiboy's profile

Bohaiboy

76 posts in 3037 days


#15 posted 10-04-2017 05:49 PM

I have lived in numerous countries and all but US use metric. Metric is easy, so much easier than imperial. Unfortunately, as Americans, we are always trying to convert from metric back to imperial. For instance, if a cutout calls for 72 mm, we are scratching our heads to try to think how many 1/8 or 1/16th that will be versus taking it as an absolute. If I need to have 72 mm, it is very easy, it is 36 mm, 1/2 is 18 mm and so on. Whereas 72 mm is 2.835”, the fractional portion lies somewhere between 13/16 and 7/8” (14/16”) But then trying to divide those by 2 or 4 creates additional math headaches.

Think of it this way, what size is your car engine? I bet it is in liters of displacement and no one even considers converting that to cu. in. the way engines used to be. JMTCW.

-- Tim, Houston, TX area

View oldnovice's profile

oldnovice

7753 posts in 4610 days


#16 posted 10-04-2017 05:53 PM

Being able to do it correctly, without any aids, only works up to four beers!

-- "Facts do not cease to exist because they are ignored." -- Aldous Huxley

View 000's profile

000

2859 posts in 2142 days


#17 posted 10-04-2017 08:19 PM



I have lived in numerous countries and all but US use metric. Metric is easy, so much easier than imperial. Unfortunately, as Americans, we are always trying to convert from metric back to imperial. For instance, if a cutout calls for 72 mm, we are scratching our heads to try to think how many 1/8 or 1/16th that will be versus taking it as an absolute. If I need to have 72 mm, it is very easy, it is 36 mm, 1/2 is 18 mm and so on. Whereas 72 mm is 2.835”, the fractional portion lies somewhere between 13/16 and 7/8” (14/16”) But then trying to divide those by 2 or 4 creates additional math headaches.

Think of it this way, what size is your car engine? I bet it is in liters of displacement and no one even considers converting that to cu. in. the way engines used to be. JMTCW.

- Bohaiboy

A decimal is still a decimal.
What do you do when the measurement falls somewhere in between 4 and 5mm ?

View torus's profile

torus

545 posts in 1656 days


#18 posted 10-04-2017 08:34 PM


What do you do when the measurement falls somewhere in between 4 and 5mm ?

It is easy – it is 4.5 mm ;)

-- "It's getting better..." - put this on my RIP stone!

View AlaskaGuy's profile

AlaskaGuy

6748 posts in 3552 days


#19 posted 10-04-2017 08:55 PM

What do you do when the measurement falls somewhere in between 4 and 5mm ?

It is easy – it is 4.5 mm ;)

- torus

Well yeah but you have to be able to see those little lines.

-- Alaskan's for Global warming!

View Woodknack's profile

Woodknack

13584 posts in 3623 days


#20 posted 10-04-2017 11:10 PM



What you going to do when the network is down or the battery gives up or you drop it in the toilet?
- AlaskaGuy

Well I’m not clumsy and I don’t let the battery run dead but it is possible the internet could coincidentally go down at that moment and I would have to face the minor inconvenience of manually converting or just use the less familiar system of measurement.

What do you do when the batteries go dead on your digital calipers or you drop them in the toilet?

-- Rick M, http://thewoodknack.blogspot.com/

View AlaskaGuy's profile

AlaskaGuy

6748 posts in 3552 days


#21 posted 10-04-2017 11:15 PM

What you going to do when the network is down or the battery gives up or you drop it in the toilet?
- AlaskaGuy

Well I m not clumsy and I don t let the battery run dead but it is possible the internet could coincidentally go down at that moment and I would have to face the minor inconvenience of manually converting or just use the less familiar system of measurement.

What do you do when the batteries go dead on your digital calipers or you drop them in the toilet?

- Rick_M


I have more than one digital caliper…...and a couple metric tapes and rules. If I can’t make it then I go eat some pickled frozen MukTuk

Oh yeah I have a big magnifying glass too. If I just have to get work done I go to cubits

-- Alaskan's for Global warming!

View Woodknack's profile

Woodknack

13584 posts in 3623 days


#22 posted 10-05-2017 01:27 AM



I have more than one digital caliper…...and a couple metric tapes and rules. If I can t make it then I go eat some pickled frozen MukTuk

Oh yeah I have a big magnifying glass too. If I just have to get work done I go to cubits

- AlaskaGuy

See, no need to worry. :)

-- Rick M, http://thewoodknack.blogspot.com/

View fliming's profile

fliming

1 post in 970 days


#23 posted 02-23-2019 08:44 AM

If you need an alternate of this tool you can easily convert your conversions here by simply following this https://mm-to-inches.net

View Sylvain's profile

Sylvain

1395 posts in 3742 days


#24 posted 02-23-2019 09:37 AM

This week, I made a little dovetail box for my chisels.
I didn’t measure anything, using only hand tools.

Using mm comes from metal working/engineering and makes sense in woodworking if you use machines.

If you go shopping for furniture (except maybe in US) dimensions are given in cm (centimeter). {IKEA.US web site shows the two systems.}
Centimeter is what I used at primary school while learning metric system ( commensurate to a school notebook). For me it is concrete; millimeter is somewhat more abstract.

I use cm if I want to design something in wood which needs defined dimensions. Now If I have to install Blum equipment, I will have to use the dimensions given by the instructions, no choice.

When doing scientific calculations, I would not use “1 mm” but “1 E-03 m” because using basic units will prevent magnitude errors.

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

View JohnDon's profile

JohnDon

193 posts in 2412 days


#25 posted 02-23-2019 04:20 PM

I use a cheap plastic caliper (HF sells them for $2). Slide cursor on mm scale, immediately see fractions on other scale; easier to align than double scale rule.

View GR8HUNTER's profile

GR8HUNTER

8982 posts in 1955 days


#26 posted 02-23-2019 04:26 PM

for the line boring machine we had you had to buy a tape measure in MM to lay out holes cause if your using BLUM this is the easiest way on doing it then stretchers and all work out just right :<)))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN :<))

View ArtMann's profile

ArtMann

1483 posts in 2059 days


#27 posted 02-23-2019 04:48 PM

Decimal inches work just as well as the metric system and for the same reasons.

View xeddog's profile

xeddog

360 posts in 4250 days


#28 posted 02-23-2019 04:53 PM


What do you do when the measurement falls somewhere in between 4 and 5mm ?

It is easy – it is 4.5 mm ;)

- torus


Wouldn’t that be 4,5mm? I think I would say 4-ish mm

Wayne

View CWWoodworking's profile

CWWoodworking

2207 posts in 1422 days


#29 posted 02-23-2019 05:51 PM

I live in a world where millimeters don’t exsist.

View Sam99's profile

Sam99

1 post in 795 days


#30 posted 08-17-2019 03:12 PM

Yes, I am using MM to Inches to convert Millimeters to Inches

View MrRon's profile

MrRon

6184 posts in 4486 days


#31 posted 08-17-2019 08:51 PM

This metric vs imperial measuring system keeps popping up. I guess it will never be resolved, nor should it. Either system works just fine. I am now retired, but in my past job, I had to work in both systems. I never had a problem doing so. I feel right at home using either system. I prefer the imperial system because that is what I grew up using. If you grew up with the metric system, then that is what you would prefer. Everything I do, is in the imperial decimal system. Even woodworking is done using decimals; fractions are not close enough for the work I do. I know many are not conversant in mathematics, but I am lucky in that mathematics comes as second nature to me. I switch between imperial to metric to decimal without a pause. Decimal equivalents are etched into my brain, so I don’t have to refer to charts. If one works with numbers on a continual basis then it becomes second nature.

View oldnovice's profile

oldnovice

7753 posts in 4610 days


#32 posted 08-18-2019 04:45 AM

How about converting fortnights per furlong?
Pardon me, it’s late at night and I am bushed!

-- "Facts do not cease to exist because they are ignored." -- Aldous Huxley

View knockknock's profile

knockknock

473 posts in 3416 days


#33 posted 08-18-2019 09:03 AM

I have Inch/Metric rulers and combination squares. I wish rulers came by default with the scales on my GEI MODEL 1086A .

-- 👀 --

View MrRon's profile

MrRon

6184 posts in 4486 days


#34 posted 08-18-2019 06:53 PM

I wonder if Alexa or Echo could be programmed to make instant metric/imperial conversions? You could say “ALEXA convert 6 ounces to grams” or “ALEXA convert 7 inches to millimeters”.

View Woodknack's profile

Woodknack

13584 posts in 3623 days


#35 posted 08-18-2019 06:58 PM

Google assistant will convert. I don’t have Alexa installed to test.

-- Rick M, http://thewoodknack.blogspot.com/

View RobS888's profile

RobS888

2829 posts in 3088 days


#36 posted 08-18-2019 08:27 PM



Decimal inches work just as well as the metric system and for the same reasons.

- ArtMann

I don’t know about that, mm being smaller would require less decimal places. In fact many times you wouldn’t need a decimal with mm, but do with decimal inch. Why would that matter to me? 12.5mm is easier to remember, notate, and find on a scale than 0.492126 inches.

-- I always knew gun nuts where afraid of something, just never thought popcorn was on the list.

View LeeRoyMan's profile

LeeRoyMan

2158 posts in 969 days


#37 posted 08-18-2019 08:53 PM

convert 1 3/16” to metric.
If your good with rounding up or down to the nearest 1/2 mm than I guess your good with that.
When you know the decimal to fraction equivalents, I don’t see a problem no matter what the decimal is.
Number is a number.

View therealSteveN's profile

therealSteveN

8858 posts in 1817 days


#38 posted 08-19-2019 02:31 AM

I see America being a choice country. I never see tools, bits, rulers, pretty much anything sold that you can’t also get metric equivalent. I understand that manufacturers use both, and to work on things you may need both, but in the items you make from the ground up, if you like Metric, you can certainly make it metric.

-- Think safe, be safe

View Lazyman's profile

Lazyman

7959 posts in 2630 days


#39 posted 08-19-2019 02:46 AM

How about the new The new Metric / Inches unified ruler

One ruler to rule them all. ;-)

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View Rich's profile

Rich

7456 posts in 1832 days


#40 posted 08-31-2019 11:05 PM

Going back to the original post—that the OP is converting units for installing Blum hardware, exact conversions aren’t needed most of the time. For the drawer slides for instance, one of the measurements is the drawer width relative to the opening and the drawer side thickness. In the literature, they specify both mm and inches. For example, on the 563 undermount if the drawer side is 1/2” the drawer should be the opening width minus 5/8” or 16mm. It doesn’t matter that 5/8” isn’t exactly 16mm, because it’s close enough. In fact that’s the case for pretty much all of the measurements. If it says 12mm and all you have is an imperial rule, 1/2” is good enough.

The only time exact placement is needed is for the hinge and adapter plates, and for those, I use drilling templates and jigs. If you are a weekend warrior and install a couple of hinges a year, then use the hardware and an awl to locate your holes. The volume of work I do warrants the jigs and templates.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View rsneha's profile

rsneha

1 post in 519 days


#41 posted 05-19-2020 10:18 AM

I usually use this mm to inches converter

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