Beyond using keywords and catch phrases to identify candidates with [1] Google, this search engine also employs very powerful computational language that allows you to perform any type of calculation or conversion. Here are some examples.

-  4+3 displays 7
-  9-4 displays 5
-  3*7 displays 21
-  45/9 displays 5
-  5^3 displays 125 (5 raised to power 3)
-  11%5 displays 1 (the remainder after division)
-  sqrt, nth root ofx (sqrt(64) displays 8, if you need non-square roots you can use for example 3th root of 27)
-  sin, cos, arctan, tan…

Google calculator supports various trigonometric functions, expecting a radians value, that can be expressed also using the pi constant: sin(pi/2), tan (2/3*pi)

-  ln: displays natural (base e) logarithm: ln(e^5)
-  log: displays base 10 logarithm: log(100)
-  !: displays n factorial: 3!

Numbers can be entered also in hexadecimal, octal and binary base, using 0x, 0o and 0b prefixes, for example 5 +0xf+0b1001

Conversions

-  in degrees / in radians: convert radians to degrees: pi/2 in degrees or convert degrees into radians: 90 degrees in radians
-  in hex / in binary / in octal / in decimal: convert to each of the given bases: 16 in hex , 16 in octal, 16 in binary, 0×11 in decimal
-  use 2009 (MMIX) in Roman numerals
-  distance conversions: use 100miles in km , 1m in mm, but also 200000 km in light-second etc.

Examples:

-  100mph in kph
-  1 month in seconds
-  280 Kelvin in Celsius
-  50 Fahrenheit in Celsius
-  3 euros in $ or 3 euros in dollars