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#1
09-26-2006, 09:48 PM
 Unregistered Guest Posts: n/a
scale conversions

If I have a A3 drawing that tells me the scale is 1:250@ A1 what is the scale at A3

Is there a conversion chart to assist?
#2
09-28-2006, 10:53 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,340 Rep Power: 12
Re: scale conversions

I found a cool chart part way down the page here:
http://www.cl.cam.ac.uk/~mgk25/iso-paper.html

From A1 to A3 is 50% reduction.
#3
06-25-2007, 05:57 PM
 Unregistered Guest Posts: n/a
Re: scale conversions

i need to convert a scale from A1 1:100 to A3 what would the scale be at A3
#4
05-13-2008, 06:38 AM
 Unregistered Guest Posts: n/a
Re: scale conversions

I am trying to do the same. Convert A1 1:100 to A3. Can I take it that the scale on the A3 IS 1:50?

Thanks
#5
05-15-2008, 01:31 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,296 Rep Power: 11
Re: scale conversions

Quote:
 Originally Posted by Unregistered I am trying to do the same. Convert A1 1:100 to A3. Can I take it that the scale on the A3 IS 1:50? Thanks
A1 is bigger than A3, so my immediate reaction is that it would go the other way: A3 is 1:200. Try working out the size of something that makes sense, and convert it on both scales. It will become crystal clear which one is correct.
#6
05-15-2008, 04:15 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,708 Rep Power: 17
Re: scale conversions

Quote:
 Originally Posted by Mrs X A1 is bigger than A3, so my immediate reaction is that it would go the other way: A3 is 1:200. Try working out the size of something that makes sense, and convert it on both scales. It will become crystal clear which one is correct.
Agree that it will be 1:200 on the smaller A3 paper.
In any case a scale (line with scale lengths marked off)should always be included on the drawing as reproduction is never exactly perfect, paper stretches with humidity, etc. Any critical dimensions should be transferred to the scale line with dividers.
#7
05-15-2008, 06:06 AM
 Unregistered Guest Posts: n/a
Re: scale conversions

Thanks for your help guys.
#8
08-28-2008, 02:32 AM
 Unregistered Guest Posts: n/a
Re: scale conversions

A1 is twice the size of A3: so converting 1:100@A1 would be 1:200@A3 and that means a 50% reduction in the size of the original. A1 is bigger than A3
#9
07-15-2009, 04:33 PM
 Unregistered Guest Posts: n/a
Re: scale conversions

Hi Guys,

I had a fair bit of trouble when first learning scale conversions for paper sizes.

A little rule i was told is always double the scale for A3 paper sizes when using an A1 scale.

Eg. 1:100 (A1) = 1:200 (A3) , 1:500 (A1) = 1:1000 (A3)

Same rule only reversed when scaling from A3 to A1, so you will halve the scale.

Eg. 1:100 (A3) = 1:50 (A1) , 1:500 (A3) = 1:250 (A1)

Hope that helps. Also there is a website that explains everything in detail. Pretty handy for learning how to convert A0 to A1.

just go to wiki and search paper sizes. sorry it doesnt allow guests to post links.

Tony.
#10
05-05-2010, 08:58 AM
 500daysofsummer Guest Posts: n/a
Re: scale conversions

Its easy: lets say you have a 1:500 drawing at A3, and you want to know what the scale is when you blow it up to A1.

This is an enlargement percentage of 200%. (Go to ww.cl.cam.ac.uk/~mgk25/iso-paper. ) - just add a 'w' at the beginning and html at the end - unregistereds cant post links...

So; enlargement percentage 200%. Take your original scale (in this case it was 1:500, so we use 500). Divide this by 100, and then multiply by the enlargement percentage: 200.

So it is (500/100) x 200 = 1000.

Therefore the new scale is 1:1000

This works for any conversion of any scale of any (ISO) paper size. Sweet eh?

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