Home lock calculator
Door Handing and Swing Checker
Record hinge side and swing direction before buying handing-specific hardware.
Result
Handing code (1=LH 2=RH 3=LHR 4=RHR)
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Outswing door (1 = yes)
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Formula
Calculation logicConfirm handing with the manufacturer before ordering a handing-specific lock.
Strikes, Handing, and Swing
Strike first, lock second
A 2-1/4 in T-strike is the common swap. For kick-in resistance, fit a security strike with 3-in screws that bite the stud, not just the jamb.
Order the right hand
Stand outside facing the door. Hinges left + swings in = left-hand (LH). Outswing doors reverse the code (LHR/RHR) and want security hinges. Most smart keypads assume a handing, so set it on install day.
Verify before you buy
- Stand outside facing the door
- Record swing with a short video
- Set keypad orientation on install day