Metric and Imperial Conversion Formula Tables

Ian C. Langtree Content Writer/Editor for Disabled World
Published: 2017/12/20 - Updated: 2020/11/07
Contents: Summary - Main - Related Publications

Synopsis: Handy conversion tables show you the formulas to convert from metric system measurements to the imperial system and visa versa allowing you to do your own calculations for the conversion you need. The metric system is a decimalised system of measurement in the sense that all multiples and sub-multiples of the base units are factors of powers of ten of the unit. In the U.S. Americans frequently spell 'metre' as 'meter', and 'litre' as 'liter'; however 'metre' and 'litre' are the official BIPM names for these units.

Main Digest

Our handy conversion tables show you the formulas to convert from metric system measurements to the imperial system and visa versa allowing you to do your own calculations for the conversion you need.

Metric System

The metric system is a decimalised system of measurement in the sense that all multiples and sub-multiples of the base units are factors of powers of ten of the unit. Fractions of a decimal unit are rarely used.

The metric system, and metre was first fully described by Englishman John Wilkins in 1668 in a treatise presented to the Royal Society some 120 years before the French adopted the system. It is believed that the system was transmitted to France from England via the likes of Benjamin Franklin. In the U.S. Americans frequently spell 'metre' as 'meter', and 'litre' as 'liter'; however 'metre' and 'litre' are the official BIPM names for these units.

Imperial System

Imperial units are the measurement units that were historically used in the British Commonwealth countries. They were very similar, but not identical, to the units that are still predominantly used in the United States. Some of the differences are:

Our handy conversion tables below show you the formulas to convert from metric system measurements to the imperial system and visa versa allowing you to do your own calculations for the conversion you need. Measurement conversions include weight, mass, length, volume, and temperature.

Continued below image.
Section of a yellow tape measure using the superior metric system unit of standard measurement.
Section of a yellow tape measure using the superior metric system unit of standard measurement.
Continued...
Metric to Imperial Conversion Chart
ConvertToMultiply by
Kilometers Miles 0.62
Kilometers Feet 3280.8
Meters Feet 3.28
Centimeters Inches 0.39
Millimeters Inches 0.039
Liters Quarts 1.057
Liters Gallons 0.264
Milliliters Cups 0.0042
Milliliters Ounces 0.0338
Celsius Fahrenheit °C x 9/5 + 32 = °F
Kilogram Tons 0.0011
Kilogram Pounds 2.2046
Grams Ounces 0.035
Grams Pounds 0.002205
Milligrams Ounces 0.000035
Imperial to Metric Conversion Chart
Convert To Multiply by
Fahrenheit Celsius (°F - 32) x 5/9 = °C
Inches Meters 0.0254
Inches Centimeters 2.54
Inches Millimeters 25.40
Feet Meters 0.30
Yards Meters 0.91
Yards Kilometers 0.00091
Miles Kilometers 1.61
Ounces Milliliters 29.57
Cups Milliliters 236.6
Quarts Liters 0.95
Gallons Liters 3.785
Ounces Milligrams 28350
Ounces Grams 28.35
Pounds Kilograms 0.454
Tons Kilograms 907.18
Convert Length: Inch, Foot, Yard
  • 1 inch = 2.54 centimeters
  • 1 inch = 25.4 millimetres
  • 1 foot = 0.3048 meters
  • 1 foot = 30.48 centimetres
  • 1 foot = 12 inches
  • 1 yard = 0.9144 meters
  • 1 yard = 91,44 cm
  • 1 yard = 3 feet
  • 1 yard = 0.000568181818 miles
Convert Imperial to Metric Area: Inches, Feet, Acres
  • 1 square inch = 6.452 square cm
  • 1 square foot = 929.0304 square cm
  • 1 square yard = 8361.2736 square cm
  • 1 square yard = 9 square feet
  • 1 acres = 0.404685642 hectares
  • 1 square mile = 2.59 km
Distance: Miles
  • 1 mile = 1.609344 kilometers
  • 1 mile = 1,760 yards
Volume: Liter
  • 1 liter = 1.0566882 US quarts
  • 1 liter = 10 deciliters
  • 1 liter = 100 centiliters
  • 1 liter = 0.264172051 US gallons
Convert Imperial to Metric Speed: MPH
  • 1 mile per hour = 1.609344 kilometers per hour
Temperature: Fahrenheit
  • (Fahrenheit - 32) x 0.55 = Celsius
Volume: Cup, Pint, Quart, Gallon
  • 1 pint = 2 cups
  • 1 quart = 8 pints
  • 1 US quart = 0.94635295 liters
  • 1 gallon = 4 quarts
  • 1 US gallon = 3.7854118 liters
Weight: Gram, Dram, Kilogram
  • 1 gram = 0.0352739619 ounce
  • 1 dram = 0.0625 ounce
  • 1 gram = 0.564383391 drams
  • 1 dram = 1.7718452 grams
  • 1 kilogram = 2.20462262 pounds
  • 1 gram = 1000 milligrams
  • 1 kilogram = 0.00110231131 US tons
Weight: Ounces, Pounds, Tons
  • 1 ounce = 28.3495231 grams
  • 1 ounce = 16 drams
  • 1 ounce = 0.0625 pounds
  • 1 pound = 16 ounces
  • 1 pound = 0.45359237 kilograms
  • 1 grain = 64.79891 milligram
  • 1 US ton = 907.18474 kilograms
Distance: Kilometers
  • 1 kilometer = 0.621371192 miles
  • 1 kilometer = 1000 meters
Length: Centimeter, Meter
  • 1 centimeter = 0.393700787 in.
  • 1 centimeter = 0.01 meters
  • 1 meter = 3.2808399 feet
  • 1 meter = 1.0936133 yards
  • 1 meter = 0.001 kilometers
  • 1 meter = 100 centimeters
Convert Metric to Imperial Speed: KPH
  • 1 kilometer per hour = 0.621371192 miles per hour
Temperature: Celsius
  • (Celsius x 1.8) + 32 = Fahrenheit
Convert Metric to Imperial Area: Centimeters, Hectares
  • 1 sq. cm = 0.15500031 sq. in.
  • 1 sq. cm = 0.00107639104 sq. ft
  • 1 sq. cm = 0.000119599005 sq. yrds.
  • 1 hectares = 2.47105381 acres

Hard and Soft Measurement Conversions

Hard Conversions

A hard conversion (adaptive conversion) may not be exactly equivalent. A hard conversion changes the measurement to numbers and units in the new system that are easier to work with. Nominal values are sometimes allowed and used, and a hard conversion sometimes involves a slightly different substitution configuration, or measurement, of the item in question.

Soft Conversions

Some conversion measurements from a system of units to another needs to be exact - this means there is no increasing - or decreasing - the precision of the first measurement unit. This is called soft conversion. Soft conversion does not involve changing the actual physical configuration of the thing that is being measured.

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Cite This Page (APA): Langtree, I. C. (2017, December 20). Metric and Imperial Conversion Formula Tables. Disabled World. Retrieved April 16, 2024 from www.disabled-world.com/calculators-charts/metimp.php

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