Convert to Base Metric Units (Unit Conversion

Conversion Tool

From: (Initial Units or Expression)


Result: (Initial Value with Base Metric Units)

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

Help

Examples

From	Result
foot	0.3048 meters
83 deg-F	301.48333333 kelvin
(6 * 18) mile^2	2.7971871592e+8 meters^2
70.4 kg + 115 lb	122.56312255 kilograms
(20ft + 2in) * (15ft - 8in)	26.85413984 meters^2
-16.2 + sqrt(16.2^2 - 4 * 3.1 * 0.7)	-0.27015379861
(5 qt + 2 gal)/ 4.751 seconds	0.0025894734368 meter^3 / second
pi (4.7 cm)^2 sin(41 deg)	0.0045529041288 meters^2
50 meters * 25 meters * 10 ft	3810 meters^3
(2000 V/m) * 35 cm * 2 elementary-charges	2.243047142e-16 meter^2 kilograms / second^2

The results are returned in the base units of the modern metric system called the International System of Units (or SI units). The base units are meter (length), kilogram (mass), second (time), kelvin (temperature), ampere (electric-current), mole (amount-of-substance), and candela (luminous-intensity). Although they are dimensionless derived units, this tool also reports radians (plane-angle) and steradians (solid-angle) for clarity.

"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