Salon Sanitation Calculator

Required Contact Time comes entirely from the Disinfection Method lookup -- ten, two, or zero minutes for Barbicide, spray, or autoclave respectively (lines 20-25) -- and none of the volume inputs (clients, stations, tool sets, or cost per ounce) feed that table. Busy days change how many cycles you run and what you spend, but the minimum wet contact time the calculator reports is fixed by the method you select.

Each method follows a separate formula. Barbicide adds two ounces per station plus half an ounce per client immersion (lines 44-46). Hospital-grade spray multiplies surface wipes by two ounces and adds one ounce per tool cycle (lines 47-48). Autoclave skips chemical tool immersion and charges one and a half ounces per surface wipe only (lines 50-51), while pouch cost is handled separately in the autoclave branch (lines 58-62).

The calculator compares how long a tool set is tied up -- required contact time plus five drying minutes -- against how often that station actually needs a fresh set, based on your real client volume (Clients per Day divided across Stations over an eight-hour day) (lines 81-89). Busier stations and longer contact times both raise the rotation count; a slow station with a fast disinfectant can get by on two sets, while a busy station with a long-contact disinfectant needs more. The result multiplies by station count (line 90), then subtracts the tool sets you already have per station (line 91). If your current inventory cannot cover that rotation window, Additional Sets to Buy reports the gap.

Sanitation Cost per Client divides Total Daily Cost -- disinfectant spend plus autoclave pouch cost when applicable (lines 55, 64) -- by Clients per Day and rounds to cents (lines 79-81). On a day with zero clients the per-client figure is zero, because the division guard requires a positive client count.