The most common backset is 2 3 8 but 2 3 4 is also quite common usually used on exterior doors.
Standard door lock backset.
Pack your locks with a 2 3 8 inch or 2 3 4 inch latch depending on which backset you specify.
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If you dont have any hardware on your door just measure from the edge of the door to the center of the bore hole the large hole where the door knob assembly is mounted.
This dimension is used for all types of locking devices including cylindrical and mortise locks as well as deadbolts and handle sets.
The term backset is used to describe the location of a lock in relation to the edge of a door.
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The backset is the distance from the edge of the door to the center of the 2 1 8 inch bore hole.
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In the united states there are two common backsets for residential door locks.
And you might find all three on a residential home or a 2 3 8 on a commercial building.
As commercial hardware normally uses a 2 3 4 backset while residential uses 2 3 8 backset.
However in our area you actually have three choices.
While some lock locations are fairly standard they can vary based on hardware design manufacturer and region.
2 3 8 2 3 4 or 5 backset.
You might think that it would be a simple answer.