How Do I Calculate Percentage Increase or Decrease?
Compare the difference between old and new values with the original value to calculate percentage change.
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How-To
Answers and guides
How Do I Calculate a Discount Price?
Find the discount amount from the original price and percentage, then subtract it to get the final price.
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How Do I Calculate Fuel Cost for a Trip?
Estimate trip fuel cost using distance, vehicle fuel economy and the current price of fuel.
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How Do I Calculate My Age From My Date of Birth?
Age calculations compare the birth date with a target date while accounting for whether the birthday has occurred that year.
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How Do I Convert Kilograms to Pounds?
Convert kilograms to pounds with a standard conversion factor and see quick examples for common weights.
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How Do I Convert Kilometers to Miles?
Use a simple conversion factor to estimate kilometers in miles, with examples for common driving distances.
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Percentage CalculatorCalculate percentages, percentage change and percentage of a number.→
Discount CalculatorCalculate sale price and savings from a percentage discount.→
Fuel Cost CalculatorEstimate trip fuel cost from distance, efficiency and fuel price.→
Age CalculatorCalculate age from a date of birth.→