Dates, conversions, and everything else.
Calculate exact age in years, months, and days from a birth date.
The gap between two dates in days, weeks, months, and working days.
Find the date a number of days, weeks, or months from another date.
Calculate the duration between two times, in hours and minutes.
Calculate your grade point average from course grades and credit hours.
What you must score on the final to land your target grade.
Calculate the tip and total bill, and split it evenly among a group.
Find the sale price and amount saved for any percentage-off discount.
Fuel cost for a journey, and the cost per person if you share it.
Convert either direction between Roman numerals and ordinary numbers.
Counts, reading time, and speaking time for any text.
Generate a strong, random password with customizable length and character sets.
Draw random numbers, with or without repeats.
Convert a color between HEX, RGB, and HSL, with contrast checks.
Bedtimes that let you wake at the end of a sleep cycle rather than the middle of one.