Calculate tip, total, and per-person share.
Splitting a restaurant bill fairly, including tip, is a very common everyday math problem.
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Diners and travelers, especially in tipping cultures.
Three calculators in one: percent-of, X is what % of Y, and percentage change.
Calculate exact age in years, months, days and total days.
Days, weeks, months, and years between two dates.
Calculate Body Mass Index in metric or imperial units.
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