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Everyday Math

Percentages, proportions, discounts and bill splitting.

• Percentage calculatorCalculate X% of a value, what percentage one number is of another, and the percent change between two values.
• Rule of threeSolve simple proportions: if A is to B, then C is to D. With practical examples and the difference between direct and inverse proportion.
• Discount calculatorCalculate the final discounted price and how much you save. Table by discount tier and the traps of stacked discounts.
• Tip calculatorCalculate the tip, the total bill and each person's share. With tipping conventions for the US and abroad.