Master Key System Calculator
Key bitting calculation for master and sub-master groups.
Inputs
Results
Total key combinations
1,000,000
MACS-compliant combos168,070
Available change keys42,016
Keys per group (max)10,504
Incidental keys (risk)96
Capacity used (%)0.1%
System feasible (1/0)1
Estimated cost$1,046
How to Use This Calculator
- Enter the number of individual doors (changes) in the system.
- Set the number of master key levels needed (grandmaster, master, sub-master).
- Input the number of key holders at each level.
- Review the minimum key blank series and cylinder count required.
- Select a restricted keyway to prevent unauthorized key duplication.
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