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How do you measure PC fan size?

Ok. Time to ask a stupid question. How in Gods green earth do you measure a PC case fan. Iv heard diagonally, down the middle, screw hole to screw hole, edge to edge. I want a definitive answer. How to you measure a PC case fan. PC that needs the fan in case that helps: gateway dx4870-ub318

Thank you.
16 answers Last reply Best Answer
More about measure fan size
  1. Personally, I think 120mm means 120mm diameter fan.
  2. edge to edge

    EDIT to fix dead image link.

    92mm fan.
  3. Never mind my answer....
  4. Ok. Im having to measure the fan by using the case. I measured from hole to hole and got 85mm and 70mm. ( i can mount 2 diffferent size fans) I cant measure a fan due to the fact of not having one. I know a 120 is too big and a 80mm is to small. So is a 92mm what i need?
  5. I will get you 80 and 92mm hole spacings.

    stand by.
  6. Best answer
    I get about 71-71.5 for an 80mm and about 82-82.5 for a 92mm fan.

    Looks like you do have the 80/92mm setup on that case.
  7. I used a thread and online ruler http://iruler.net, because had nothing that could be used for measuring
  8. From QuietPC.com

    How do I measure fan size?

    The size of fan you need will generally be determined by the size of the fan fitting position in your PC case. The sizes of all the fans on our website are shown as measured along any one of the fan's four sides, NOT the distance between the fan's screw holes! Our most popular fan size is 120mm, followed by 80mm. This isn't really dictated by customer preference, but more by recent designs of PC cases.

    As for the thickness (depth) of the fan, generally 25mm (1 inch) is by far the most common depth, although smaller fans can have shallower depths such as 15mm or even 10mm. All our fans are 25mm thick unless otherwise stated. If you have any questions about which fan you should order, please don't hesitate to get in touch.

    If you know the distance between the fan mounting screw holes but don't know what fan size to order, please see the following table. Note that the mounting hole measurements shown below are taken horizontally or vertically between the holes and not diagonally.

    Screw hole spacings and fan sizes
    32mm between screw holes 40mm fan size
    40mm between screw holes 50mm fan size
    50mm between screw holes 60mm fan size
    60mm between screw holes 70mm fan size
    72mm between screw holes 80mm fan size
    83mm between screw holes 92mm fan size
    105mm between screw holes 120mm fan size
  9. Great resource for beginner like me.
    Thank you.
  10. Great info. This should be pinned for others to see and find better. I just bought a case for a build I am doing and it had 3 different fan size slots. This information allowed me to order the exact fan sizes I needed online. I am an expert at building computers but sometimes even I need a little help with such things.

    Thanks so much
    Tim
  11. Thanks for this information - if you'd be kind enough to tell me what size fan will have screwholes 120mm apart this will give me exactly what I need!! You'd be an official life-saver!!

    editus said:
    From QuietPC.com

    How do I measure fan size?

    The size of fan you need will generally be determined by the size of the fan fitting position in your PC case. The sizes of all the fans on our website are shown as measured along any one of the fan's four sides, NOT the distance between the fan's screw holes! Our most popular fan size is 120mm, followed by 80mm. This isn't really dictated by customer preference, but more by recent designs of PC cases.

    As for the thickness (depth) of the fan, generally 25mm (1 inch) is by far the most common depth, although smaller fans can have shallower depths such as 15mm or even 10mm. All our fans are 25mm thick unless otherwise stated. If you have any questions about which fan you should order, please don't hesitate to get in touch.

    If you know the distance between the fan mounting screw holes but don't know what fan size to order, please see the following table. Note that the mounting hole measurements shown below are taken horizontally or vertically between the holes and not diagonally.

    Screw hole spacings and fan sizes
    32mm between screw holes 40mm fan size
    40mm between screw holes 50mm fan size
    50mm between screw holes 60mm fan size
    60mm between screw holes 70mm fan size
    72mm between screw holes 80mm fan size
    83mm between screw holes 92mm fan size
    105mm between screw holes 120mm fan size
  12. 140mm fans have a 124-125mm hole spacing. That seems to be the closest.
  13. Thanks nukemaster that's what the internet is suppose to be all about, great post.
  14. good thread thanks guys
  15. Pyrofan said:
    Ok. Time to ask a stupid question. How in Gods green earth do you measure a PC case fan. Iv heard diagonally, down the middle, screw hole to screw hole, edge to edge. I want a definitive answer. How to you measure a PC case fan. PC that needs the fan in case that helps: gateway dx4870-ub318

    Thank you.


    Screw hole spacings and fan sizes:

    32mm between screw holes - 40mm fan size

    40mm between screw holes - 50mm fan size

    50mm between screw holes - 60mm fan size

    60mm between screw holes - 70mm fan size

    72mm between screw holes - 80mm fan size

    83mm between screw holes - 92mm fan size

    105mm between screw holes - 120mm fan size
  16. This thread is nearly 3 years old.

    I am going to lock this due to the age.
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