| |||

## Examples | ||||
---|---|---|---|---|

## From | ## To | ## Result | ||

foot |
inch | 12 inches | ||

83 deg-F | deg-C | 28.333333333 degrees-Celsius | ||

(360 * 160) ft^2 | acre |
1.3223140496 acres | ||

70.4 kg + 115 lb | lb | 270.20543258 pounds-mass | ||

(20ft + 2in) * (15ft - 8in) | yd^2 | 32.117283951 yards^2 | ||

-16.2 + sqrt(16.2^2 - 4 * 3.1 * 0.7) | 1 | -0.27015379861 | ||

(1/4) mile / 4.751 seconds | miles/hour | 189.43380341 miles / hour | ||

pi (4.7 cm)^2 sin(41 deg) | mm^2 | 4552.9041288 millimeters^2 | ||

50 meters * 25 meters * 10 ft |
imperial gallons | 8.3808283602 * 10^5 gallons-UK | ||

(2000 V/m) * 35 cm * 2 elementary-charges | eV | 1400 electron-volts |

Enter the units or the mathematical expression with units that you want to convert. This can be as simple as a unit name or as complex as a formula involving additions, subtractions, multiplications, divisions, powers, square roots, and scientific functions (sin, cos, tan, arcsin, arccos, arctan, sinh, cosh, tanh, log, ln, and exp). The expression entry is very flexible; try typing an expression as you would normally write it.

## Expression Features | ||||
---|---|---|---|---|

## Feature | ## Example | ## Interpretation | ||

## Abbreviations are supported (see the name index). |
ft | foot | ||

m |
meter | |||

## Standard metric power prefixes are supported. | millisecond | 0.001 seconds | ||

kilometer | 1000 meters | |||

## Scientific notation is supported | 4.2 * 10^-3 | 0.0042 | ||

4.2e-3 | 0.0042 | |||

2 * 10^3 | 2000 | |||

2e3 | 2000 | |||

## "^" is the power operator. |
4^2 | 16 | ||

mile^2 | mile mile | |||

second^-1 | 1 / second | |||

## sqrt is the square root function. | sqrt(4 m^2) | 2 meters | ||

sqrt(-37) |
(not supported) | |||

## sin, cos, tan, arcsin, arccos, arctan, sinh, cosh, tanh, log, ln, and exp represent their respective scientific functions. A trig function argument without units is considered to be in radians but you can also use units such as deg with function arguments. | cos(pi/3) | 0.5 | ||

cos((pi/3) rad) |
0.5 | |||

cos(60 deg) | 0.5 | |||

sin(100 grad) | 1.0 | |||

tan(800 mil) | 1.0 | |||

## "*" or a space between expressions represents the multiply operator. However, if the expressions are simple and have the same dimensions, a space is treated as an addition (which is common with written expressions). | (4 * 5) grams | 20 grams | ||

3 newtons * 2 meters | 6 newton meters | |||

5ft 45lbf | 225 foot pounds-force | |||

6ft 4in |
6 feet + 4 inches | |||

2hr 37min | 2 hours + 37 minutes | |||

## Modifiers square, sq, squared, cubic, cu, cubed, and reciprocal have their normal meaning. | square meter | meter^2 | ||

sq yard | yard^2 | |||

second squared | second^2 | |||

cubic inch | inch^3 | |||

cu yd | yard^3 | |||

cm cubed | centimeter^3 | |||

reciprocal second | 1 / second | |||

## In general, a "-" connecting names is treated the same as a space. If you need a subtraction operator or negative sign involving just unit names, put at least one space around the "-". | kilogram-meter/second^2 | kilogram meter/second^2 | ||

kg - lb | (subtraction) | |||

cubic-yard | yard^3 | |||

cubic -yard | (-yard)^3 | |||

## Sometimes a "-" is used to distinguish a unit name from an expression with the same words. |
kilogram-calorie | the unit kilocalorie | ||

kilogram calorie | a mass times an energy |

An expression for the "To" entry typically involves only units that are combined with multiplications, divisions, and powers. However, it is possible to use more general expressions like those for the "From" entry. Consider these special examples:

## Special "To" Entry Examples | |||||
---|---|---|---|---|---|

## From | ## To | ## Result | ## Problem Solved | ||

32 ft | 15 in | 25.6 * (15 inches) |
How many 15 inch stones will fit along a 32 foot path? Answer: 25.6 | ||

17000 miles/hour | c | 2.534980383 * 10^-5 speed-of-light-in-vacuum | What fraction of the speed of light is this space ship traveling? Answer: 2.534980383 * 10^-5 |