Tool 02

Rekey Math

Move the sliders. The chart compares cumulative rekeying cost (dashed) with smart-lock cost (green) and marks the crossover month.

$Flat illustration of many old keys versus one smart lock with crossing cost lines.$

Your portfolio

Units (doors):

Turnovers per unit per year:

Cost per rekey, $:

Smart lock price per door, $:

Software fee per door per month, $:

Years:

Result

Defaults are illustrative; enter your own prices. The result counts only the amounts you enter.

Model: rekeying cost = units × turnovers × price per rekey. Smart locks = units × lock price plus units × monthly fee. It ignores installation time, locksmith labor, lost-key fees, lockout call-outs, key handling and tax. Use your own quotes; this is a planning aid, not financial advice. Inputs are saved only in this browser.