Math calculators

Find a percent of a number, or what percent one number is of another.

Calculate the percent increase or decrease between two numbers.

Convert any fraction to a decimal — or back.

Calculate your grade point average from letter grades and credit hours.

Calculate your exact age in years, months, and days.

Find the number of days, weeks, or months between two dates.

Simplify and scale ratios.

Compute mean, variance, and standard deviation from a list of numbers.

Find the mean, median, and sum of a list of numbers.