Remember the golden rule: "You should tip 20% on the entire service cost, not per individual," says Schweitzer.

How much should you tip your hairdresser? We asked three etiquette experts, two salon professionals and a certified financial planner. Most of these experts suggest leaving 15% to 20%, depending on the service and your satisfaction. Going with 20% is nice for the stylist and you because that math is pretty simple.

Average cost for a haircut can range from $30 – $100. Haircut prices for women average about $43, while a man's haircut averages $28, according to the Professional Beauty Association, an organization for beauty industry professionals.

Salons charge for the quality of the consultation, the skill of the stylist, and the overall experience. It costs money to provide this level of service, from the associated fees of running a well-equipped salon to the time each stylist dedicates to their clients.