For restaurant worker's, it's very hard to maintain their families without tips. By giving tip we are helping them to survive. Giving tips shows our thankfulness to their service, which also makes us a little philanthropist.
It's better to give 10%-15% tip of the total bill amount to the server. To know more about the tip percentages refer this table which shows tip percentages for the corresponding services.
In few cases the service charge will be included in the total bill. So check out the bill amount before giving tip.
Giving tip shows our courtesy and satisfaction to their service
To calculate the tip percentage quickly, use this tool TipCalculator. If you have a smartphone then there are so many tip calculator apps which will be helpful to you for calculating tip amounts and splitting the bill between any number of people