A forms based utility that converts values in one unit to any other.

Lists conversion relationship between U.S. customary units and SI (International System) units, and gives conversion factors for commonly needed values — area, length, pressure, force, and volume — as well as gauge standards for sheet metal, wire, and pipes, and measures of hardness, stress, and temperature.

A series of helpful tools for use by international travelers, including a world public holidays calendar, a currency converter, maps, a metric converter, weather sites, electricity requirements (by continent and country), dialing codes, a international clothing size chart, and a time zone clock.

“A Medical Algorithm is any computation, formula, survey, or look-up table, useful in healthcare. We have collected over 1600 algorithms (taken from the biomedical literature, including research journals and textbooks) spanning major medical domains, organized into 43 chapters. To ensure the widest possible audience, the algorithms have been implem …

“Units conversion offering a very extensive range of categories and units. This interactive facility not only converts between units but also includes descriptions of usage and definitions of many of the units.”

This site provides conversions “from/to metric and imperial and US measurement systems.” It calculates the results and gives the factors for length, area, volume/capacity, mass (weight), and temperature conversions.

A guide to appropriate amounts to tip people who provide different kinds of services, including in barbershops and hair salons, casinos, cruise ships, restaurants, and trains.