Tip: You can type calculator and conversion commands directly into any Google search box, like this: 32 degrees fahrenheit in celsius.

A collection of numeric, scientific, time, currency and unit conversion calculators.

A collection of interactive sites on the web that estimate, calculate, evaluate, translate, etc.; i.e. it is a collection of links to sites that actually perform calculations, doing the work for you. The site is divided into the categories: Science/Math, Health, Finance, and A Measure of Everything Else.

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