A unit of measurement is a definite amount of a physical quantity, defined and adopted by convention and or law, that is used as a standard for measurement of the same physical quantity of any amount. A unit of measurement can measure quantities such as length, area, volume, wiehgt/mass, power, energy, heat and pressure, for examples. Americans and their products commonly use the 'English' system of measurements, which consists of things like, feet, inches, miles, pounds, gallons, and degrees Fahrenheit. The metric system is another standard used internationally and, uncommonly, in the US. This system uses units such as meter, liter, kilogram and degrees Celcius.

When making any calculations that use measurements of a physical quantity, such as multiplying length and width to get area or calculating the rough volume of a pond, you must always ensure that you are using measurements all in the same units. To do this, we use numbers called conversion factors. These numbers are the fraction in difference between two units of measurement. For your convienence, we have provided tables below of the most common units and their conversion to other common units.

To use these tables, find the unit that have a measurement in on the left side of the table. Then move right along the table until you find the column for the unit you want the measurement to be in. Multiply your first measurment by the number under the unit you want the measurement to be in, and you converted the measurement from one unit of measurement to another.

## Units of Length

To calculate: | |||||||

Multiply measurement in: ↓ | inches | feet | yards | miles | centimeters | meters | kilometers |

inches by → | 1 | 0.08333 | 0.02777 | 0.0000158 | 2.54 | 0.0254 | 0.0000254 |

feet by → | 12 | 1 | 0.33333 | 0.000189 | 30.5 | 0.305 | 0.000305 |

yards by → | 36 | 3 | 1 | 0.000567 | 91.5 | 0.915 | 0.000915 |

miles by → | 63,400 | 5,280 | 1,760 | 1 | 161,000 | 1,610 | 1.61 |

centimeters by → | 0.394 | 0.0328 | 0.01093 | 0.00000621 | 1 | .01 | 0.00001 |

meters by → | 39.4 | 3.28 | 1.093 | 0.000621 | 100 | 1 | 0.001 |

kilometers by → | 39,400 | 3,280 | 1,093 | 0.621 | 100,000 | 1,000 | 1 |

## Units of Area

To calculate: | ||||||

Multiply measurement in: ↓ | sq. feet | sq. yards | sq. miles | acres | sq. meters | sq. kilometers |

sq. feet by → | 1 | 0.1111 | 0.00000003587 | 0.0000229 | 0.0929 | 0.0000000929 |

sq. yards by → | 9 | 1 | 0.0000003228 | 0.0002066 | 0.8361 | 0.0000008361 |

sq. miles by → | 27,878,400 | 3,097,600 | 1 | 640 | 2,589,988 | 2.59 |

acres by → | 43,560 | 4840 | 0.0015625 | 1 | 4,046.856 | 0.0040469 |

sq. meters by → | 10.76391 | 1.19599 | 0.0000003861 | 0.000247 | 1 | 0.000001 |

sq. kilometers by → | 10,763,910.4 | 1,195,990 | 0.3861 | 247.1 | 1,000,000 | 1 |

## Units of Volume, cubes

To calculate: | |||||

Multiply measurement in: ↓ | cubic inches | cu. feet | cu. yards | cu. centimeters | cu. meters |

cubic inches by → | 1 | 0.0005787 | 0.000021433 | 16.387 | 0.000016387 |

cu. feet by → | 1728 | 1 | 0.037037 | 28,316.85 | 0.028317 |

cu. yards by → | 46,656 | 27 | 1 | 764,554.858 | 0.764555 |

cu. centimeters by → | 0.0610237 | 0.0000353147 | 0.00000130795 | 1 | 0.000001 |

cu. meters by → | 61,023.7 | 35.3147 | 1.30795 | 1,000,000 | 1 |

ounces by → | 1.8047 | 0.0010444 | 0.00003868 | 29.5735 | 0.0000295735 |

quarts by → | 57.75 | 0.03342 | 0.00123778 | 946.353 | 0.000946353 |

pints by → | 28.875 | 0.01671 | 0.00061889 | 473.176 | 0.000473176 |

gallons by → | 231 | 0.13368 | 0.00495113 | 3,785.41 | 0.00378541 |

liters by → | 61.0237 | 0.0353147 | 0.00130795 | 1,000 | 0.001 |

## Units of Volume, containers

To calculate: | |||||

Multiply measurement in: ↓ | ounces | quarts | pints | gallons | liters |

cubic inches by → | 0.554113 | 0.017316 | 0.034632 | 0.004329 | 0.016387 |

cu. feet by → | 957.5 | 29.922 | 59.844 | 7.48052 | 28.3168 |

cu. yards by → | 25,852.7 | 807.896 | 1,615.79 | 201.974 | 764.555 |

cu. centimeters by → | 0.033814 | 0.0010567 | 0.00211338 | 0.000264172 | 0.001 |

cu. meters by → | 33,814 | 1,056.69 | 2,113.38 | 264.172 | 1,000 |

ounces by → | 1 | 0.03125 | 0.0625 | 0.0078125 | 0.0295735 |

quarts by → | 32 | 1 | 2 | 0.25 | 0.946353 |

pints by → | 16 | 0.5 | 1 | 0.125 | 0.473176 |

gallons by → | 128 | 4 | 8 | 1 | 3.78541 |

liters by → | 33.814 | 1.05669 | 2.11338 | 0.264172 | 1 |

## Units of Weight/Mass

To calculate: | |||||

Multiply measurement in: ↓ | ounces | pounds | tons | grams | kilograms |

ounces by → | 1 | 0.0625 | 0.00003125 | 28.3495 | 0.0283495 |

pounds by → | 16 | 1 | 0.0005 | 453.592 | 0.453592 |

tons by → | 32,000 | 2,000 | 1 | 907,185 | 907.185 |

grams by → | 0.035274 | 0.00220462 | 0.0000011023 | 1 | 0.001 |

kilograms by → | 35.274 | 2.20462 | 0.0011023 | 1,000 | 1 |

## Units of Temperature

To convert between degrees Farenheit and degrees Celcius:

^{o}C = (^{o}F - 32) * (5/9)

^{o}F = (^{o}C * 9/5) + 32

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