In the USA, most kitchen counters are 36" high. This measurement was standardized many years ago when the average heighth of a female was less than it currently is. They can be set to suit your own tastes (so that you need not bend so much when doing dishes). ie., my counters are 40" high.
The typical kitchen counter height is 36" above the floor. A raised bar is typically 42" above the floor.
6 inches above the counter is good. Counters are 36 inches high, so 42 inches to the bottom of the box.
The standard height for a bathroom outlet is typically around 48 inches above the finished floor level.
The standard height for a refrigerator outlet is typically around 4 to 6 inches above the finished floor.
The recommended height for a washing machine outlet box is typically around 42 inches above the floor.
The recommended height for installing a towel ring above the counter in a bathroom is typically around 48 inches from the floor.
The standard height for a kitchen sink drain is typically around 18 inches above the floor.
The specific requirements outlined in the electrical code for kitchen counter outlets include having outlets spaced no more than 4 feet apart along the countertop, being GFCI protected, and being installed at a certain height above the countertop.
The required height for installing a bathroom GFCI outlet is typically around 42 inches above the finished floor level.
The normal shelf height for standard kitchen cabinets is typically around 18 inches above the countertop.
The recommended height for a sink drain in a kitchen or bathroom is typically around 18 to 20 inches above the floor.
The rough in height for a kitchen sink drain is typically around 16 to 18 inches above the finished floor level.