Forums >> Community >> Newbies >> How to set custom unit conversion value


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Joined: Mon, Jun 3, 2013
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Dear all I am new in Revit.
the Problem is How i set 25 mm=1 inch in conversion value. i am doing a project with metric scale, i draw the walls and lines etc in milimeter. I like to present my sheets in Imperial scale with 1inch=25mm conv. value not 1 inch= 25.4 value. For example I draw a 1500mm wall and i present it in imperail 5'0", But here it shows 4'11".
Please consider my english is not my native language.
thanks

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In feet and inches, rounded to the nearest 1/256", the dimension would be 4'11 7/128" But you have your units set to round to the nearest 1/8" . Change that setting if you want a more finite number.

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"
In feet and inches, rounded to the nearest 1/256", the dimension would be 4'11 7/128" But you have your units set to round to the nearest 1/8" . Change that setting if you want a more finite number.
"
Thanks for reply.
Yes it is 4'11 7/128. is it will be possible to accurate 5'0". and where i can set units to round to the 1/8". please tell me how.

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You would have to set your units to the nearest foot. Not a good solution.

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"
In feet and inches, rounded to the nearest 1/256", the dimension would be 4'11 7/128" But you have your units set to round to the nearest 1/8" . Change that setting if you want a more finite number.
"
Thanks for reply.
Yes it is 4'11 7/128. is it will be possible to accurate 5'0". and where i can set units to round to the 1/8". please tell me how.

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Joined: Mon, Jun 3, 2013
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You would have to set your units to the nearest foot. Not a good solution.
"
Actually i am not setting nearest to foot. i want to set ratio 1inch =25mm. where cad have a decimal madel can set convertion ratio like this. I think Revit also have this settings thanks.

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Revit does not do conversions to determine dimensions. These are actual dimensions with rounding. They are as accurate as you set the rounding to be. Revit stores all dimensions natively as feet.
Perhaps you should be drawing in feet/inches and rounding your metric to nearest 1/100.
Actually  I don't understand why you don't want accurate dimensions. Rounding to the nearest 1/8" is acceptable construction practice for single dimensions.

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"
Revit does not do conversions to determine dimensions. These are actual dimensions with rounding. They are as accurate as you set the rounding to be. Revit stores all dimensions natively as feet.
Perhaps you should be drawing in feet/inches and rounding your metric to nearest 1/100.
Actually  I don't understand why you don't want accurate dimensions. Rounding to the nearest 1/8" is acceptable construction practice for single dimensions.
"
Thanks for reply. It is not a big deal. but it is factor when contractor or client want to know the accurate imperial measurment in general we count 1 inch = 25 mm but actual calculation is 1 inch = 25.4 mm, hence revit does actual conversion.
It will be very helpfull if there is a settings where can change the conversion ratio in revit.
thanks.

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active
Joined: Mon, Jun 3, 2013
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"
Revit does not do conversions to determine dimensions. These are actual dimensions with rounding. They are as accurate as you set the rounding to be. Revit stores all dimensions natively as feet.
Perhaps you should be drawing in feet/inches and rounding your metric to nearest 1/100.
Actually  I don't understand why you don't want accurate dimensions. Rounding to the nearest 1/8" is acceptable construction practice for single dimensions.
"
Thanks for reply. It is not a big deal. but it is factor when contractor or client want to know the accurate imperial measurment in general we count 1 inch = 25 mm but actual calculation is 1 inch = 25.4 mm, hence revit does actual conversion.
It will be very helpfull if there is a settings where can change the conversion ratio in revit.
thanks.

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13079 Posts

I understand that we have a language problem but please read again.
This is NOT a conversion problem. Revit does not covert dimensions as you are asking for it to do. Conversions using a single unit can be very inaccurate because the error is accumalative and that is what you are trying to do. Revit's dimension is the total length to the nearest decimal place (or inches/feet) that you specify. SO don't think of this as 1" = 25 .... what is it for 60"=?mm
FORGET CONVERSIONS!

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"
I understand that we have a language problem but please read again.
This is NOT a conversion problem. Revit does not covert dimensions as you are asking for it to do. Conversions using a single unit can be very inaccurate because the error is accumalative and that is what you are trying to do. Revit's dimension is the total length to the nearest decimal place (or inches/feet) that you specify. SO don't think of this as 1" = 25 .... what is it for 60"=?mm
FORGET CONVERSIONS!
"
Many Thanks for tryig to understand me about units and conversion. Now I understand to ignor cinversuions. Your tips will help me to doing projects. when i set to the nearest at 6" then all is OK.
Many thanks again for tour help.

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