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Measurement is as old as history. There are 3 systems of measurement: the English, the Metric and the System International D'unites (or SI). When America separated from England, the colonies retained the English system - at about the same time the metric system was developed in France. This metric system was later modified to develop the SI system. Here we have some conversion calculators for weight, volume, length and pressure.

This is how these work:  just type a number in the field you know, and press the calculate button. It will convert the units for the rest of the boxes. Note that the units are converted first to the first box of each table, and then converted to the respective unit. This double conversion is why if you put in 1 gal, you will not get exactly 8 pints.

Calculators available here: Weight | Volume | Length | Pressure | Energy | Calorific Volume | Velocity | Temperature calculators available below

Other Calculators:
   Easy Unit Converter | Ecoterr Conversion Tools | Monachos' Calculators | Statistics Calculators from UCLA & from CSBSJ |
   Standard Deviation Calculator | Calculators from CSG Network | Business Calculators from Peacock Capital | AskNumbers.com
   Suggest a site 

Kilograms Ounces Pounds Troy
Pounds
Stones Short
Tons
Long
Tons

A pound is a unit of force and a kilogram is a unit of mass. This conversion implies that 1 lb of weight (which is a force) equals the weight exerted by 0.4536 kg of mass assuming the gravity is 9.8m/s2. On the moon, a kilogram will weigh less but still have the same mass.
Liters Fluid
Ounces
Quarts Gallons Imperial
Gallons
Pints Table
Spoons
Tea
Spoons
Meters Inches Feet Yards Miles Nautical
Miles
Microns

Atmospheres In Hg In H2O PSI mm Hg

Pascal

MPa

Energy Conversion Calculator
Btu Calories/Gram Watt Hour Kilowatt Hour Joule
Btu/ft3 kcal/m3 W/m3 J/m3
Meters per
Second
Miles per
Hour
Feet per
Minute
Feet per
Second
Inches per
Second
Kilometers per
Hour
Knots

Temperature Conversion Calculator [provided by V Moore]

Celsius Fahrenheit Kelvin Rankine