You can use the blank Google search box as a calculator. Just enter an equation, like 2+2, and then press Enter or Google Search to have Google tell you 2 + 2 = 4. For multiplication, use the asterisk (*), like this: 2*3. For division, use the slash (/), like this: 10/3. (Use the equal sign [=] at the end of your equation if you’re worried Google might not realize your query is actually math.) You can also use the search box to perform unit conversions, like this: 5 kilometers in miles or how many teaspoons in a cup? For a chart listing of units of measure that Google can convert, check out Nancy Blachman’s site, GoogleGuide, at www.googleguide. com/calculator.html.

The calculator works for simple equations and for seriously complex problems, too, like logarithms and trigonometric functions. You can find a rundown of its capabilities at www.google.com/help/calculator.html. And if you know what physical constants are, or the phrase “base of the natural system of logarithms”makes your heart pitter patter with joy, GoogleGuide does a terrific job of steering you through these features.

Tip: For a great alternativeinterface to Google’s calculator, check out Soople at http://soople.com/soople_in-tcalchome.php.