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How To Calculate Ring Height

27K views 23 replies 16 participants last post by  AndrewRose 
#1 · (Edited)
A while back I made a ring height calculator since I got tired of guessing what rings to use.

I've worked it over quite a bit to make it easier to use. You'll need the distance from the top of your hand guard to the top of your scope mount rail, the distance from the top of the rear sight to the top of the rail and some specs on your scope (eyepiece OD, objective OD and tube diameter). Then enter your preferred clearance between the hand guard and rear sight ( remember to leave room for covers) and it'll show your minimum ring height. Once all that is entered you can reverse calculate it by entering a manufacturer's ring height and it'll show how much clearance you'll have.

The best way to measure is with a caliper but if close is close enough for you then a 1/32" measuring tape will work.

The spreadsheet is in Excel .xls format and free to download.

If you have any questions on it send me a PM.

As an alternative method you can stack pennies evenly on the front and back of your mount placing your scope on the stacked pennies till it clears. Then measure the stack to find out how tall of rings you need. - This wasn't my idea, just stealing it and passing it on.

Either method works, one you need the mount and scope specs, the other you need the mount and scope.
 
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#9 ·
Thanks guys. This will make it easier for post mild TBI.
 
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#16 ·
I've got a copy but the forum wont let me post the xls file, the servers must be setup to exclude xls files due to possible virus attacks and such. If you have a way for me to post or email the file to you I'll do it, let me know.
 
#17 ·
Ok, Im not seeing any file to find out how tall of rings I need to mount my new optic. I have the Sadlak airborne optic mount and I want to use my primary Arms 1-6x acss Raptor optic...can anyone tell me what height 30mm rings I need to keep my optic as low as possible? I appreciate any help and if I have just not seen the file I apologize.
 
#19 ·
You should be able to use LOW; but you might have to move the scope rearward a little to have the power ring to clear the rear sight. Also stack dimes on the mount and place the scope on the dimes ;; when you get what you like;; measure the dimes with a micrometer and than search for rings that are that tall or close to that.
 
#24 ·
I'm focusing on the optics and mounts for the moment. I'm not positive but I may be buying a Delta 14 chassis with a very adjustable cheek riser.

I appreciate all of the replies, it has made my decision making process much faster.
 
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