Blog

Step-by-step guides, formulas, and worked examples from the Quick Calculators team.

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  How to Calculate a Tip (15%, 18%, 20%)

  Calculate a tip by multiplying the bill by the tip rate as a decimal. Quick methods for 15%, 18%, and 20%, splitting the tip, and worked examples.

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  How to Calculate a Percentage of a Number

  Calculate a percentage of a number by converting the percent to a decimal and multiplying. Formula, worked examples, and the reverse and percentage-change methods.