Convert to New Units (Unit Conversion »)

Conversion Tool

From: (Initial Units or Expression)
To: (New Units)


Result: (Initial Value with New Units)

Library of Units and Constants:	Name Index	Quantity Index	Group Index

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Examples

From	To	Result
foot	inch	12 inches
83 deg-F	deg-C	28.333333333 degrees-Celsius
(360 * 160) ft^2	acre	1.3223087603 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	8.3808283602e+5 gallons-UK
(2000 V/m) * 35 cm * 2 elementary-charges	eV	1400 electron-volts

"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.

As part of the results, the interpretation of your expression is shown in order to verify that it matches what you intended. Wherever you see a unit or constant in the results, click on it to read a description of it. This helps verify that the correct unit or constant was used in the calculation.

Many units, such as the "foot" or "gallon", have multiple variations and the result will change based on the variation you pick. A note is provided in the results when you use units that have variations.

Below are some important expression features:

Expression Features	Examples	Meaning of Examples
Common abbreviations are allowed (see the Name Index)	ft m	foot meter
Standard metric power prefixes are allowed	millisecond kilometer	0.001 seconds 1000 meters
Scientific notation is allowed	4.2e-3 2e3	0.0042 2000
"" 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 (as is common with written expressions).	(4 * 5) grams 3 newtons * 2 meters 5ft 45lbf 5ft 8in (5ft 8in)(4ft 3in) 2hr 37min 14s	20 grams 6 newton meters 225 foot pounds-force 5 feet + 8 inches (5 feet + 8 inches) * (4 feet + 3 inches) 2 hours + 37 minutes + 14 seconds
"^" represents the power operator	4^2 mile^2 second^-1	16 mile mile 1/second
"sqrt" represents the square root function	sqrt(4 m^2) sqrt(-37)	2 meters (error)
"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 like "deg" with function arguments.	cos(pi/3) cos((pi/3) rad) cos(60 deg) sin(100 grad) tan(800 mil)	0.5 0.5 0.5 1.0 1.0
Modifiers "square", "sq", "squared", "cubic", "cu", "cubed", and "reciprocal" have their normal meaning	square meter sq yard seconds squared cubic inch cu yd cm cubed reciprocal seconds	meter^2 yard^2 seconds^2 inch^3 yd^3 cm^3 1/seconds
In general, a "-" connecting names is treated the same as a space. If you need a subtraction operator or negative sign, put at least one space around the "-".	kilogram-meter/second^2 kg - lb cubic-yard cubic -yard	kilogram meter/second^2 kg - lb (subtraction) yard^3 (-yard)^3
Sometimes a "-" is required to distinguish a unit name from an expression with the same words.	kilogram-calorie kilogram calorie	the unit "kilocalorie" a mass times an energy

"To" Entry

This entry accepts an expression in the same form as that described for the "From" entry above. Like the examples above, an expression for the "To" entry typically involves only units combined with multiplications, divisions, and powers. However, it is possible to use more general expressions and constants. Consider these 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	2.534980383e-05 speed-of-light-in-vacuum	What fraction of the speed of light is this space ship traveling? Answer: 2.534980383e-05