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2016
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Kirt Blattenberger,
BSEE
 KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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1. Tables of Metric Units of Measurement
In the metric system of measurement, designations of multiples and subdivisions of any unit may be arrived at by combining with the name of the unit the prefixes deka, hecto, and kilo meaning, respectively, 10, 100, and 1 000, and deci, centi, and milli, meaning, respectively, onetenth, onehundredth, and one thousandth. In some of the following metric tables, some such multiples and subdivisions have not been included for the reason that these have little, if any currency in actual usage.yotta,  (Y),  meaning 10^{24}  deci,  (d),  meaning 10^{1}  
zetta,  (Z)  meaning 10^{21}  centi,  (c),  meaning 10^{2}  
exa,  (E),  meaning 10^{18}  milli,  (m),  meaning 10^{3}  
peta,  (P),  meaning 10^{15}  micro,  (μ),  meaning 10^{6}  
tera,  (T),  meaning 10^{12}  nano,  (n),  meaning 10^{9}  
giga,  (G),  meaning 10^{9}  pico,  (p),  meaning 10^{12}  
mega,  (M),  meaning 10^{6}  femto,  (f),  meaning 10^{15}  
kilo,  (k),  meaning 10^{3}  atto,  (a),  meaning 10^{18}  
hecto,  (h),  meaning 10^{2}  zepto,  (z),  meaning 10^{21}  
deka,  (da),  meaning 10^{1}  yocto,  (y),  meaning 10^{24} 
Units of Length
10 millimeters (mm)  = 1 centimeter (cm)  
10 centimeters  = 1 decimeter (dm) = 100 millimeters  
10 decimeters  = 1 meter (m) = 1000 millimeters  
10 meters  = 1 dekameter (dam)  
10 dekameters  = 1 hectometer (hm) = 100 meters  
10 hectometers  = 1 kilometer (km) = 1000 meters 
Units of Area
100 square millimeters (mm^{2})  = 1 square centimeter (cm^{2})  
100 square centimeters  = 1 square decimeter (dm^{2})  
100 square decimeters  = 1 square meter (m^{2})  
100 square meters  = 1 square dekameter (dam^{2}) = 1 are  
100 square dekameters  = 1 square hectometer (hm^{2}) = 1 hectare (ha)  
100 square hectometers  = 1 square kilometer (km^{2}) 
Units of Liquid Volume
10 milliliters (mL)  = 1 centiliter (cL)  
10 centiliters  = 1 deciliter (dL) = 100 milliliters  
10 deciliters  = 1 liter^{†} = 1000 milliliters  
10 liters  = 1 dekaliter (daL)  
10 dekaliters  = 1 hectoliter (hL) = 100 liters  
10 hectoliters  = 1 kiloliter (kL) = 1000 liters 
Units of Volume
1000 cubic millimeters (mm3)  = 1 cubic centimeter (cm^{3})  
1000 cubic centimeters  = 1 cubic decimeter (dm3) = 1 000 000 cubic millimeters 

1000 cubic decimeters  = 1 cubic meter (m^{3}) = 1 000 000 cubic centimeters = 1 000 000 000 cubic millimeters 
Units of Mass
10 milligrams (mg)  = 1 centigram (cg)  
10 centigrams  = 1 decigram (dg) = 100 milligrams  
10 decigrams  = 1 gram (g) = 1000 milligrams  
10 grams  = 1 dekagram (dag)  
10 dekagrams  = 1 hectogram (hg) = 100 grams  
10 hectograms  = 1 kilogram (kg) = 1000 grams  
1000 kilograms  = 1 megagram (Mg) or 1 metric ton(t) 
2. Tables of U.S. Units of Measurement^{††}
In these tables where foot or mile is underlined, it is survey foot or U.S. statute mile rather than international foot or mile that is meant.Units of Length
12 inches (in)  = 1 foot (ft)  
3 feet  = 1 yard (yd)  
161/2 feet  = 1 rod (rd), pole, or perch  
40 rods  = 1 furlong (fur) = 660 feet  
8 furlongs  = 1 U.S. statute mile (mi) = 5280 feet  
1852 meters  = 6076.115 49 feet (approximately) = 1 international nautical mile 
Units of Area^{†††}
144 square inches (in2)  = 1 square foot (ft^{2})  
9 square feet  = 1 square yard (yd^{2}) = 1296 square inches  
2721/4 square feet  = 1 square rod (sq rd)  
160 square rods  = 1 acre = 43 560 square feet  
640 acres  = 1 square mile (mi^{2})  
1 mile square  = 1 section of land  
6 miles square  = 1 township = 36 sections = 36 square miles 
Units of Volume^{†††}
1728 cubic inches (in3)  = 1 cubic foot (ft3)  
27 cubic feet  = 1 cubic yard (yd3) 
Gunter’s or Surveyors Chain Units of Measurement
0.66 foot (ft)  = 1 link (li)  
100 links  = 1 chain (ch) = 4 rods = 66 feet  
80 chains  = 1 U.S. statute mile (mi) = 320 rods = 5280 feet 
3. Notes on British Units of Measurements
In Great Britain, the yard, the avoirdupois pound, the troy pound, and the apothecaries pound are identical with the units of the same names used in the United States. The tables of British linear measure, troy mass, and apothecaries mass are the same as the corresponding United States tables, except for the British spelling "drachm" in the table of apothecaries mass. The table of British avoirdupois mass is the same as the United States table up to 1 pound; above that point the table reads:14 pounds  = 1 stone  
2 stones  = 1 quarter = 28 pounds  
4 quarters  = 1 hundredweight = 112 pounds  
20 hundredweight  = 1 ton = 2240 pounds 
4 gills  = 1 pint  
2 pints  = 1 quart  
4 quarts  = 1 gallon  
2 gallons  = 1 peck  
8 gallons (4 pecks)  = 1 bushel  
8 bushels  = 1 quarter 
20 minims  = 1 fluid scruple  
3 fluid scruples  = 1 fluid drachm = 60 minims  
8 fluid drachms  = 1 fluid ounce  
20 fluid ounces  = 1 pint  
8 pints  = 1 gallon (160 fluid ounces) 
4. Tables of Units of Measurement
(all underlined figures are exact)
Units  Inches  Feet  Yards  Miles  Centimeters  Meters 
1 inch =  1  0.083 333 33  0.027 777 78  0.000 015 782 83  2.54  0.025 4 
1 foot =  12  1  0.333 333 3  0.000 189 393 9  30.48  0.304 8 
1 yard =  36  3  1  0.000 568 181 8  91.44  0.914 4 
1 mile =  63 360  5 280  1 760  1  160 934.4  1609.344 
1 centimeter =  0.393 700 8  0.032 808 40  0.010 936 13  0.000 006 213 712  1  0.01 
1 meter =  39.370 08  3.280 840  1.093 613  0.000 621 371 2  100  1 
Units  Links  Feet  Rods  Chains  Miles  Meters 
1 link =  1  0.66  0.04  0.01  0.000 125  0.201 168 4 
1 foot =  1.515 152  1  0.060 606 06  0.015 151 52  0.000 189 393 9  0.304 800 6 
1 rod =  25  16.5  1  0.25  0.003 125  5.029 210 
1 chain =  100  66  4  1  0.0125  20.116 84 
1 mile =  8 000  5 280  320  80  1  1609.347 
1 meter =  4.970 960  3.280 833  0.198 838 4  0.049 709 60  0.000 621 369 9  1 