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Metric System

Homeschool Fast Facts!
-Conversion Calculator-

Metric System

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Background: International System of Units
The name International System of Units (SI) was given to the system by the 11th General Conference of Weights and Measures (CPGM) in 1960.  At the 14th CGPM in 1971, the current version of the SI was completed.

In this Fast Fact we provide a calculator to convert some commonly used U.S. Customary Units (CU) and International System of Units (SI).

To Use Calculator:
  1. Type a known value into the left column.
  2. Hit the "Tab" key or click outside the cell just filled.
  3. Read the answer in the right column.

click an underlined word to jump to area of interest
Length Area Mass Liquid Volume Temperature

Length
Type in a known number
for conversion
Conversion Factor Tab or click
and read the results
inches * 25.4 =  millimeters
feet * 30.48 =  centimeters
yards * 0.9144 =  meters
miles * 1.609344 =  kilometers

millimeters * 0.03937 =  inches
centimeters * 0.032808 =  feet
meters * 1.093613 =  yards
kilometers * 0.621371 =  miles
 
Area
Type in a known number
for conversion
Conversion Factor Tab or click
and read the results
square inches * 6.4516 =  sq centimeters
square feet * 0.09290304 =  sq meters
square miles * 2.589988 =  sq kilometers
acres * 0.4046873 =  hectares

square centimeters * 0.155 =  sq inches
square meters * 10.7639 =  sq feet
square kilometers * 0.386102 =  sq miles
hectares * 2.471044 =  acres
 
Mass
Type in a known number
for conversion
Conversion Factor Tab or click
and read the results
ounces (avoirdupois) * 28.34952 =  grams
pounds (avoirdupois) * 0.453924 =  kilograms
short tons (2000 lbs.) * 0.9071847 =  metric tons

grams * 0.035275 =  ounces (avoirdupois)
kilograms * 2.204622 =  pounds (avoirdupois)
metric tons * 1.102311 =  short tons (2000 lbs)
 
Liquid Volume
Type in a known number
for conversion
Conversion Factor Tab or click
and read the results
fluid ounces (US) * 29.57353 =  milliliters
pints (US) * 0.4731765 =  liters
quarts (US) * 0.9463529 =  liters
gallons (US) * 3.785412 =  liters

milliliters * 0.033814 =  fluid ounces (US)
liters * 2.113376 =  pints (US)
liters * 1.056688 =  quarts (US)
liters * 0.264172 =  gallons (US)
 
Temperature
Type in a known number
for conversion
Conversion Factor Tab or click
and read the results
°Fahrenheit - 32 / 1.8 =  °Celsius
°Celsius * 1.8 + 32 =  °Fahrenheit
 
 
  1. Thanks to Alan Simpson at coolnerds.com for posting javascript & examples used in above calculations.
  2. Thanks to National Institute of Standards & Technology for conversion factors used in above calculations.
  3. Rounding errors may occur when reversing calculations.
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