The metric system is a system of measurement that uses the meter, liter, and gram as base units of length (distance), capacity (volume), and weight (mass) respectively.
LENGTH  Meter (m) 
MASS  Gram (g) 
VOLUME  Liter (L) 
Metric system prefixes tell you how much bigger or smaller a unit is than the base unit. These prefixes are all powers of 10, which makes converting from one metric measurement to another very simple. Here are some common prefixes.
KILO: 1,000 × Base
HECTO: 100 × Base
DECA: 10 × Base
[BASE]
DECI: 0.1 × Base
CENTI: 0.01 × Base
MILLI: 0.001 × Base
MICRO: 0.000001 × Base
One of the biggest advantages that the metric system offers is that its units scale by powers of 10. Because of this, converting within metric measurements is usually as easy as multiplying or dividing a given measurement by a power of 10 to find the new value (or, as a shortcut, simply moving its decimal point). Here are some examples, but we encourage you to examine the general process and practice converting metric to metric on your own to get the hang of the procedure.
TO CONVERT  TO  OPERATION  BECAUSE 
kilometers  meters  divide by 1,000  meters is 3 steps down from kilometers 
kilometers  centimeters  divide by 100,000  centimeters is 5 steps down from kilometers 
meters  decameters  multiply by 10  decameters is one step up from meters 
grams  kilograms  divide by 1,000  grams is 3 steps down from kilograms 
TO CONVERT  TO  OPERATION 
centimeters  inches  divide by 2.54 
meters  inches  multiply by 39.37 
meters  feet  multiply by 3.281 
meters  yards  multiply by 1.094 
meters  miles  divide by 1609.34 
kilometers  miles  divide by 1.6093 
TO CONVERT  TO  OPERATION 
grams  ounces  divide by 28.3495 
kilograms  ounces  multiply by 35.274 
pounds  grams  multiply by 453.592 
kilograms  pounds  multiply by 2.205 
kilograms  tons  divide by 907.184 
TO CONVERT  TO  OPERATION 
milliliters  teaspoon  divide by 4.92892 (some texts just use 5) 
milliliters  tablespoon  divide by 14.7868 (some texts just use 15) 
liter  fluid ounce  multiply by 33.814 
liter  cup  multiply by 4.167 
liter  gallon  divide by 3.78541178 
**Please round as required by your specific course.
TO CONVERT  TO  FORMULA 
Celsius (C)  Fahrenheit (F)  Multiply by 1.8, then add 32 i.e., F = 1.8C + 32 
Fahrenheit (F)  Celsius (C)  Subtract 32, then divide by 1.8 i.e., C = (F  32)/1.8 
Celsius (C)  Kelvin (K)  add 273.15 i.e., K = C + 273.15 
Fahrenheit (F)  Kelvin (K)  Subtract 32, then divide by 1.8, then add 273.15 i.e., K = (F  32)/1.8 +273.15 
There are various ways to measure angles:
Note: the minutes and seconds used in trigonometry do not refer to measures of time, they refer to angle measurements.
LENGTH 

MASS 

VOLUME 

TO CONVERT  TO  OPERATION 
inches  feet  divide by 12 
inches  yards  divide by 36 
feet  yards  divide by 3 
square feet  square yards  divide by 9 
cubic feet  cubic yards  divide by 27 
feet  miles  divide by 5280 
yards  miles  divide by 1760 
TO CONVERT  TO  OPERATION 
ounces  pounds  divide by 16 
pounds  tons  divide by 2000 
TO CONVERT  TO  OPERATION 
teaspoon  tablespoon  divide by 3 
tablespoon  fluid ounce  divide by 2 
fluid ounce  cup  divide by 8.115 
cup  pint  divide by 1.972 
pint  quart  divide by 2 
quart  gallon  divide by 4 
**Please round as required by your specific course.
TO CONVERT  TO  MULTIPLY BY 
inches  centimeters  2.54 
inches  meters  0.0254 
feet  meters  0.3048 
yards  meters  0.9144 
miles  meters  1609.34 
miles  kilometers  1.6093 
TO CONVERT  TO  MULTIPLY BY 
ounces  grams  28.3495 
ounces  kilograms  0.0283 
pounds  grams  453.592 
pounds  kilograms  0.453592 
tons  kilograms  907.184 
TO CONVERT  TO  MULTIPLY BY 
teaspoon  milliliters  4.92892 (some texts just use 5) 
tablespoon  milliliters  14.7868 (some texts just use 15) 
fluid ounce  liter  0.02957353 
cup  liter  0.23658824 
gallon  liter  3.78541178 
**Please round as required by your specific course.
TO CONVERT  TO  MULTIPLY BY 
degrees  radians  (π ÷ 180°) 
radians  degrees  (180° ÷ π) 
degrees  minutes  60 
degrees  seconds  3,600 
minutes  seconds  60 
minutes  degrees  (1 ÷ 60) 
seconds  degrees  (1 ÷ 3,600) 
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