Can someone please convert Inches into mils

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Forum topic by Shzard posted 07-25-2012 12:03 PM 1527 views 0 times favorited 12 replies Add to Favorites Watch
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2 posts in 2644 days

07-25-2012 12:03 PM

Topic tags/keywords: question tip planer shaping arts and crafts modern

I found some plans of a x2 seat + table setup that I would like to make for my Nana

As I do not live in America I do not understand Inches and such

I have tried using google to convert but I’m not sure on the rounding

Thats the original plans

I would like some if possible to convert into metric

12 replies so far

View JAGWAH's profile


929 posts in 3596 days

#1 posted 07-25-2012 12:12 PM

I use Construction Master 5 on my IPhone help me when I have to deal with your crazy metrics. It works both ways. But what helps me most was dealing with it directly by buying a metric tape rule and building accordingly.

Here’s my effort at the conversion.

-- ~Just A Guy With A Hammer~

View JJohnston's profile


1622 posts in 3803 days

#2 posted 07-25-2012 12:20 PM

If you use Windows, download this converter. It’s one of the best, and easiest. You’ll still have to convert the fractional part of the inch to decimal. I assume you know how to do that.

Otherwise, convert the fractional inch to decimal, then multiply by 25.4 to get millimeters. No need to worry about rounding, since you will be test-fitting each piece and taking it to whatever final dimension fits.

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

View Sawkerf's profile


1730 posts in 3580 days

#3 posted 07-25-2012 01:16 PM

1 inch = 25.4 cm

-- Adversity doesn't build reveals it.

View KnickKnack's profile


1098 posts in 4078 days

#4 posted 07-25-2012 02:40 PM

1 inch = 25.4 cm
I think you meant MM—————1 inch = 25.4 mm :-)

There are a lot of “conversion charts” around – this one, for example.
As JJ said – these are all approximate, so you need to “make sure it fits” yourself.

-- "Do not speak – unless it improves on silence." --- "Following the rules and protecting the regulations is binding oneself without rope."

View LukieB's profile


966 posts in 2842 days

#5 posted 07-25-2012 03:23 PM

25.4 is all you need to know. To convert inches to millimeters take the inches measurement (let’s say 1.5 inches) and multiply it by 25.4 (1.5 inches x 25.4 = 38.1 mm)

To convert mm to inches simply reverse the formula, take your mm measurement (let’s say 12.7mm) and divide by 25.4 (12.7 mm divided by 25.4 = .5 inches or 1/2”.

Also, when you’re doing this you need the decimal equivalent for your calculations. Most drawings will be in fractions. 1/4”, 1/2”, 3/4” are easy, (.25,.5,.75) and all you need to do for the trickier ones is divide the fraction. 9/16” would be 9 divided by 16 = .5625

Hope that helps, and makes sense, and doesn’t just sound like the ramblings of a crazy person : )

-- Lucas, "Someday woodworks will be my real job, until then, there's this"

View Paul M Cohen's profile

Paul M Cohen

86 posts in 4290 days

#6 posted 07-25-2012 05:53 PM

Since you have the plans in Sketchup it should be able to do it. Under model info just change the units.

-- Paul, Beaverton OR,

View hhhopks's profile


659 posts in 2889 days

#7 posted 07-25-2012 06:16 PM

I thought inches is to keep all these tool companies in business! It’s like a subsidy.
They get to sell you two sets of tools. One metric and one English.
In addition, its an excuse to keeps our (US) kids dumb as the school system spents ungodly amount of time teaching it(with very poor result).

-- I'll be a woodworker when I grow up. HHHOPKS

View HerbC's profile


1801 posts in 3371 days

#8 posted 07-25-2012 09:12 PM


If I remember correctly, it took only a couple of days to learn English measures when I was in the second grade. Of course that’s over 50 years ago… But we had much better teachers then.


-- Herb, Florida - Here's why I close most messages with "Be Careful!"

View Dallas's profile


3599 posts in 2999 days

#9 posted 07-25-2012 09:56 PM

Interesting take on it hhhopks.

Let’s see, during WWI, the US saved the collective European posterior with a piece of lead and copper .30” across.

The same sized piece of lead and copper did it again in WWII.

For years, during the cold war the US Imperial measurement of .30” kept citizens of West Berlin able to move about freely.

That is until the United Nations decided to standardize ammunition sizes, so now everything is 7.62mm…. which divided by 25.4 comes out to what??? Hmmmmm, That would be, ..... no wait for it,.......Yes, wait,....... .30”

Aside from the fact that most of my tools have both Metric and Imperial measurements on them.

Maybe there is something to be said for both methods of measurement.

-- Improvise.... Adapt...... Overcome!

View Grandpa's profile


3263 posts in 3187 days

#10 posted 07-25-2012 11:01 PM

I have a tape measure that is metric on one edge and inches on the other. I have one and that is one too many. They are worthless. It is always the side you need and the wropng system on it. Just get a calsulator and sit down with it for 30 minutes and you will have all your dimensions converted. 2.54 or 25.4 depending on what you want in the end. that is all you need to know. ....unless you convert to bars for pressure. Not going there.

View Sawkerf's profile


1730 posts in 3580 days

#11 posted 07-25-2012 11:31 PM

Oops, you’re right, Knicknack. Must have been in a hurry. – lol

-- Adversity doesn't build reveals it.

View Shzard's profile


2 posts in 2644 days

#12 posted 07-26-2012 12:56 AM

Thank you to everyone who helped, I have converted all my dimensions into mils ready to buy the timber

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