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Common Unit Conversion Factors

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: ↓inchesfeetyardsmilescentimetersmeterskilometers
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. feetsq. yardssq. milesacressq. meterssq. kilometers
sq. feet by →   1   0.11110.000000035870.0000229   0.09290.0000000929
sq. yards by →   9   1   0.00000032280.0002066   0.83610.0000008361
sq. miles by →27,878,400   3,097,600   1   6402,589,988   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 →10,763,910.41,195,990   0.3861   247.11,000,000   1

Units of Volume, cubes

To calculate:
Multiply measurement in: ↓cubic inchescu. feetcu. yardscu. centimeterscu. meters
cubic inches by →10.00057870.00002143316.3870.000016387
cu. feet by →172810.03703728,316.850.028317
cu. yards by →46,656271764,554.8580.764555
cu. centimeters by →0.06102370.00003531470.0000013079510.000001
cu. meters by →61,023.735.31471.307951,000,0001
ounces by →1.80470.00104440.00003868 29.57350.0000295735
quarts by →57.750.033420.00123778946.3530.000946353
pints by →28.8750.016710.00061889473.1760.000473176
gallons by →2310.133680.004951133,785.410.00378541
liters by →61.02370.03531470.001307951,0000.001

Units of Volume, containers

To calculate:
Multiply measurement in: ↓ouncesquartspintsgallonsliters
cubic inches by →0.5541130.0173160.0346320.0043290.016387
cu. feet by →957.529.92259.8447.4805228.3168
cu. yards by →25,852.7807.8961,615.79201.974764.555
cu. centimeters by →0.0338140.00105670.002113380.0002641720.001
cu. meters by →33,8141,056.692,113.38264.1721,000
ounces by →10.031250.06250.00781250.0295735
quarts by →32120.250.946353
pints by →160.510.1250.473176
gallons by →1284813.78541
liters by →33.8141.056692.113380.2641721

Units of Weight/Mass

To calculate:
Multiply measurement in: ↓ouncespoundstonsgramskilograms
ounces by →10.06250.0000312528.34950.0283495
pounds by →1610.0005453.5920.453592
tons by →32,0002,0001 907,185907.185
grams by →0.0352740.002204620.000001102310.001
kilograms by →35.2742.204620.00110231,0001

Units of Temperature

To convert between degrees Farenheit and degrees Celcius:

oC = (oF - 32) * (5/9)

oF = (oC * 9/5) + 32

Can't find what you need to calculate something? Check out or page of Helpful Formulas and Calculations or contact us for assistance.