Door Latch Backset Checker

Round corner: most common retrofit.
Square corner: older and commercial doors.
Drive-in: no plate; the latch presses into the bore.

Check a replacement latch backset against common residential sizes.

Result

2-3/8 in match (1 = yes)

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2-3/4 in match (1 = yes)

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Verify the replacement latch faceplate and installation template before purchase.

Residential doors use 2-3/8 in or 2-3/4 in, measured edge to hole center. Adjustable latches cover both; fixed latches do not.

Wrong plate means chiseling. Bring the old latch to the store when in doubt.