Travel formulas

Enter Bill, Tip %, and People for the Currency Tip Split Calculator; enter percentage fields as percentage points. The calculator reports Tip, Total, and Per person: Tip is a percent of the bill; split by number of people. People must be a positive whole number, and Bill should be entered in one currency.

Enter Distance (mi) and Avg speed (mph) for the Flight Duration Calculator; retain the units printed in each label. The calculator reports Hours: Duration is distance over speed. Distance and Average speed must be compatible and Average speed must be positive.

Enter Time zones crossed and Direction (0=west,1=east) for the Jet Lag Recovery Calculator; use finite values in the indicated domain. The calculator reports Rough recovery days: Simple rule-of-thumb recovery estimator for time-zone shifts. The estimate is a rough adjustment guide, not a prediction of individual sleep response.

Enter Limit and Current weight for the Packing Weight Remaining Calculator; use finite values in the indicated domain. The calculator reports Remaining: Remaining = limit − current packed weight. Limit and Current weight must use the same unit; a negative Remaining means the bag is overweight.

Enter Distance, Avg speed, MPG, and Fuel $/unit for the Road Trip Cost Calculator; keep Distance and Avg speed compatible with MPG and Fuel $/unit. The calculator reports Hours, Fuel volume, and Fuel cost: Fuel cost from distance, MPG, and price per gallon. MPG and Fuel price must use matching gallon and currency conventions.