The Global Tip Calculator calculates tips for Hotels & Restaurants, Porters and Taxi''s with tip hints for 84 countries around the globe. The calculator allows you to change any value in the calculation including the tip amount, the percentage, the total to be paid and the bill amount, all other values are adjusted as you change one value. The porter tip calculation provides entry fiels for numbers of suitcases and the tip per suitcase. The Taxi tip calculation includes fields for Fare, Toll, Tip percentage and Total to be paid.