Convert to New Units

From:

( Initial Units or Expression )

To:

( New Units )

Result:

( Initial Value with New Units )

 

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Help Information

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

The "From" Entry

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

The "To" Entry

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

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