Everyday math
Percentages, ratios, averages — quick math without a spreadsheet.
- Time CalculatorAdd or subtract time periods, or calculate the duration between two clock times.
- Hours CalculatorCalculate hours and minutes worked between two times, with optional break time deduction.
- Percentage Increase CalculatorCalculate percent change from one value to another. Works for increases and decreases.
- GPA CalculatorCalculate your unweighted and weighted GPA on a 4.0 scale. Supports honors and AP/IB course weighting.
- Days Between Dates CalculatorCalculate the exact number of days, weeks, months, and business days between any two dates.
- Percentage Difference CalculatorCalculate the percent difference between two values. Symmetric — order does not matter.
- Percentage Off CalculatorCalculate the discounted price and how much you save. Type the original price and the percent off.
- Ratio CalculatorSolve a ratio for any missing value. Type three numbers, get the fourth.
- Average CalculatorCalculate the mean, median, and mode of any list of numbers. Paste any list separated by commas, spaces, or new lines.