Everyone has a stingy friend who barely tips 10 percent at a restaurant and another friend who tips over 20 percent regardless of the service.

So how much should you really tip for various services?

Although there are no clear-cut rules on tipping etiquette, there are some unwritten guidelines that people follow.

When at a restaurant, there are several opportunities at which you should tip the people who serve you.

First, if you valet your car, it is suggested it is suggested to tip $2 or $3 when you receive your car after the event.

When you get inside, sometimes there is a coat check or somewhere you can put your coat (usually in more upscale restaurants). When using this service, tip $1 per coat when you receive your coat after the event.

The most common tip to give at a restaurant is the waiter.

Most people know that giving 15 percent of the bill is customary, but if the service is exceptional, it is common to give as much as 20 percent.

Even if the service is unsatisfactory, do not walk out of the restaurant without tipping. Instead, speak to a manager there to resolve any issues and then leave around 10 percent.

Similar to restaurants, when you go to a bar, it is customary to tip the bartender.

People usually leave $1 or $2 for the bartender.

But, a good rule of thumb to use is either 15 percent of the tab or at least fifty cents per drink.

Usually, drinks are anywhere between $3 and $6, so leaving $1 in these cases is common.

At many places, such as Starbucks, you will see a tip jar.

It is not necessary to tip at these places because the service they provide is minimal.

However, it is suggested to tip if you have a complicated order or receive change that you would rather not carry around.

Another place where tipping is standard is at hotels.

When you arrive at your hotel, there will usually be a bellhop ready to help you with your bags.

Typically, give $1 per bag and an additional tip for any trouble he has with your bags.

Also, before you leave for the day, you should put anywhere between $2 and $5 on a table in your room for the hotel maids to collect once they finish cleaning.

Although you do not see this service being performed, a good tip will ensure the best service from them for the duration of your trip.

Other services you should tip for are taxi rides, food delivery, hair styling and spa services.

For taxi rides, usually 15 percent is enough, but it usually depends on how far you travel.

You should give an additional tip if the taxi driver helps you load and unload your bags, usually just an extra dollar or so.

For food delivery, you should pay about 10 percent of the bill if the delivery is normal.

But, you should also consider giving the delivery person a little extra for any difficulties they may have had, such as inclement weather and trouble finding the delivery address.

If the bill is less than $10, however, do not give less than $1.

For hairstylists, it varies depending on the services you are getting.

Give 10 percent to 20 percent for the haircut, and $1 or $2 additional for the other services they provide you.

Finally, for spa services, it depends on who is treating you.

If the owner is the one providing the service, no tip is necessary.

However, if service is being done by someone else, the typical 15 percent to 20 percent should suffice, depending on the quality and efficiency.

Even though these are suggested amounts, you are always welcome to tip more than exceptional service. If you do so, it will likely be received very well by the worker.

And, in turn, he or she will treat you like a celebrity.