DIRECTORY: Calculator Collection

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Science  22 Nov 2002:
Vol. 298, Issue 5598, pp. 1521
DOI: 10.1126/science.298.5598.1521c

Web calculators are not just for finding out how many drachmas equal $1 or what time it is in Ulan Bator, Mongolia. At Martindale's Calculators Online Center, you can do just about anything from calculating the estimated running speed of an extinct brontosaurus to figuring out the expected due date of your pregnant Nigerian dwarf goat.

With over 16,495 calculators indexed on this site, look no further to remind yourself how to convert grams to moles or degrees Fahrenheit to degrees Celsius. Part of Martindale's larger online science reference work (Science, 17 July 1998, p. 303), this site is organized alphabetically by topic, with annotations discussing each calculator's pros and cons. You can also explore how several different calendars can be used to look up today's date in the ancient Mayan timekeeping system, or translate your name into Egyptian hieroglyphics.

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