百分比計算器

Calculate exact age in years, months, and days from a date of birth - plus total months, weeks, days, hours, and minutes, the weekday you were born, and a countdown to your next birthday.

Calculate the missing width or height for any aspect ratio, simplify a size to its ratio, and scale images or video without distortion.

Calculate the mean, median, mode, range, and standard deviation of any list of numbers. Paste comma, space, or line-separated values and get every summary statistic at once.

Calculate gross profit margin, markup, and selling price from cost and revenue. Solve for price from a target margin and see margin versus markup side by side.