MK Calc is a free web based service which enables you, the professional locksmith, to create simple master key systems in a flash.

• All major bands; Schlage, Best, Lockwood & many more
• Inline & Small Form Interchangeable Core (SFIC)
• From 3 to 7 chambers
• Download to Spread Sheet, HTML or MK Express
• 1, 2 or 3 level Master Key Systems
• Flexible chamber allocation
• Design, view & edit on your Phone, Tablet or Desktop

• It is free; Register and have a play...
• Take a look at the FAQ Page