Door Backset Calculator

Calculate the precise backset distance for your smart lock installation. Ensure perfect alignment between lock and door frame with professional-grade accuracy.

Door Specifications

Enter your door measurements and lock specifications for precise backset calculation.

Standard range: 1.375" to 3"

About Door Backset

The backset is the distance from the edge of the door to the center of the lock hole. This measurement is critical for proper lock installation and ensuring the lock bolt aligns correctly with the strike plate.

Standard Backset Sizes

  • 2-3/8" (60mm): Most common for residential doors
  • 2-3/4" (70mm): Standard for commercial applications
  • Custom: Some applications may require non-standard backsets

ANSI/BHMA Standards

This calculator follows ANSI/BHMA A156.2 standards for lock installation specifications, ensuring compatibility with standard door hardware and proper security functionality.