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Kinney's Shooting Supply

Ring Sizing Tool

To use this Ring Sizing tool, convert all sizes from inches to millimeters.
Enter inches in decimal form, then hit "Enter".
Equals mm
To calculate your ring height begin here:
A. Enter the actual outside diameter, in millimeters, of the Objective end of your scope
Note: Use the actual measurement, not the stated lens size of your scope.
Note: Be sure to account for lens covers if you use them.
mm
B. Enter the size of your scope tube in millimeters.
Note: Use 25.4 mm for 1" scopes.
mm
C. Enter height in millimeters of any adapter rail if you are using one.
Note: Enter 0 if you are not using one.
mm
D. Place a straight edge across the receiver and measure the distance from this level down to the barrel.
Enter that number here:
mm
Answer:
This is the minimum height of the rings that you will need for the scope to clear the barrel.
Note: If you are using a 20/25MOA rail you may have to add a little to the calculated height.
mm