Utilities calculators and tools

Everyday tools

Work out the gratuity and split it across the table, with the pre-tax-versus-total choice made explicit instead of assumed.

Convert a number to Roman numerals or a numeral back to a number, with a bar for values past 3,999 and strict checking of the form.

Convert length, weight, temperature, volume, area, speed, time, and digital storage, using exact defined factors.

Generate a strong random password in your browser, and see its entropy in bits, not just a vague "strong" label.

Roll any dice, from a single d20 to a fistful of d6, and see each die, the total, and the range you should expect.

Find the score you need on the final to hit your target, plus the best and worst grades still on the table.

Turn your letter grades and credit hours into a 4.0-scale GPA, with the one switch most tools hard-code: whether an A+ counts as 4.0 or 4.3.

Find the "feels like" temperature from the air temperature and wind speed, using the official NWS formula, with a frostbite flag.

Find how hot it really feels from the temperature and humidity, using the full NWS procedure, with the danger category.

Find the dew point from temperature and humidity, the honest measure of how muggy the air feels, with a comfort band.