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Europe's Metric System

Travel with Grams, Meters, Liters, and Centigrade
This explains the metric system as used in Europe and how to convert USA to metric units.

Comparison between European metric and American units of measure.

These comparisons of units of measure are practical for everyday use when traveling in Europe. Of course there are other useful comparisons, like the ratio of mile to kilometer for those driving in Europe and the European way of measuring temperature. Exact conversion factors for these and other units are provided in tables below.

Carpe diem. Vivere bene! Gratia Deo.

Chapter 27 of

HOW TO EUROPE: The Complete Travelers Handbook
John Bermont

John Bermont — Chef du Site

This entire book is published totally free on-line by the author and photographer, yours truly, with help from my daughter Stephanie. Yes, you can copy — if you ask first. Please read my copyright and permissions statements. Visit my home page at enjoy-europe for truck loads of more helpful illustrated travel information sans pareil. If you have questions or comments after reading this chapter please see NOTE TO READERS. Updated 28 October 2015.

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You'll have to go metric in a hurry.


Weights and measures in Europe are drastically different than those we know in the USA. Every country uses the metric system, with only a few exceptions and those are only allowed in Britain, within limits. So if you didn't learn it in middle school this chapter is a quick lesson in a fundamental part of the European infrastructure.

By the way, electricity has nothing to do with the metric system but it is also shockingly different in Europe. Before you plug in anything over there be sure to read my chapters on electricity:

  1. Electric Converters: Why You Should NEVER EVER Use a Converter.
  2. European Electricity: Voltage, Frequency, Watts. Converters, Plugs, Adapters..



First, let's take a short refresher course on ordinary American weights and measures. The American system is derived from the system historically used in Britain. Because it is "derived from" you may correctly infer that they are not identical.

The smallest unit of weight in everyday use is the Avoirdupois ounce. We call it the ounce. Next up is the pound, 16 ounces. Then we jump to the ton, 2,000 pounds. Internationally speaking, the American ton is known as the short ton. A hundredweight, 100 pounds, is also used in commerce.

American liquid measurements normally start with the fluid ounce, not to be confused with the ounce used in weight measurement. Increasing quantities are the pint of 16 fluid ounces, the quart of two pints, and the gallon of four quarts. A pint of water weighs about one pound. Cooks also use the cup measurement of 8 ounces.

Length measurement starts with the inch, about the length of the last digit of your index finger. Then 12 inches make a foot, three feet make a yard, and 5,280 feet make a mile.


Troy weights, named after the French city Troyes, are used for precious metals. The troy ounce is about 10% heavier than an avoirdupois ounce. But a troy pound is 18% lighter than an avoirdupois pound. The reason for this apparent discrepancy is that there are 16 ounces in an avoirdupois pound and only 12 ounces in a troy pound. Unless you are a jeweler you won't often see troy weights.


The first stop for Americans is often England. There is where you'll find your first confusion. The British formerly used the same names for weights and measures that we do but this is now generally illegal. A British green grocer was arrested and tried for selling bananas by the pound. He was convicted of this heinous crime and summarily punished. Britain is a member of the European Union which has decreed metric for all members. Britain has joined the metric club with limited exceptions to the old system.

Road signage is still in miles and ale is still served by the pint in British pubs, indefinitely. A British mile is the same distance as an American mile but a British pint is an imperial pint, 20% larger than an American pint. A British pint has 20 imperial ounces so you would expect that it would be 25% larger than an American pint of 16 ounces. But, the imperial fluid ounce is smaller than an American fluid ounce. The correct answer is that an imperial pint is 20% more than an American pint. Now you can find a trivia game and win the weights and measures category.

Oops, the game is not over. When you buy your brew in a store it has to be in a metric container. An imperial pint is 568.26 milliliters. If the pub pint of ale ever gets outlawed you would have to order a five-sixty-eight-point-twenty-six. I guess the bar keeper will know you've had too many when you can't get all of that out of your mouth.

A unique British unit of weight is the stone. People weigh themselves in stone, or at least they did before the UK went metric. One stone is 14 pounds.


Metrics in America

Most Americans have heard that the United States is converting to the metric system. Some busy-bodies are not content with the simple units of measure that we grew up with and for various reasons they have advocated that the USA convert to the metric system. Their rationale is that most of the rest of the world has already gone metric. I say "So what?" In fact, metric was made legal in the USA way back in 1866 but never sold a napkin. If it ain't broke why fix it? Pounds, yards, and gallons worked for daddy so why change it?

In recent years the metric advocates have succeeded in getting Congress to require metric units on many products. For the past 10 years or so all product labels now have the metric equivalent of the weight, length, or volume in parenthesis next to the good old American way of measuring things. For example, here I have a 20 ounce (567 gram) can of sugar and a box of hand wipes 8 inches x 12.5 inches (203.2 millimeters x 317.5 millimeters). Having those metric units on the labels is just so darn practical — not.


I know what some of you are thinking by now. But before you start accusing me of having metriphobia please be aware that I have been using both American and metric units from university days throughout my career, doing it comfortably for decades. I am a chemical engineer. In doing design calculations for chemical and gas process plants and oil refineries I must use data from laboratories. The lab chemists use metric units for EVERYTHING in the laboratory. Chemical engineers must use all that metric lab data and produce results in American units for darn near EVERYTHING. Pump specifications must be written in gallons per minute and pipe sizes in nominal inches. Therefore, I have been converting grams-per-liter to pounds-per-gallon and doing many similar calculatons since long before electronic calculators and computers came along and made the task a bit easier.

There is a gradual change taking place in this niche of technology. The change is primarily driven by American multi-national companies which want to use global standards for business purposes, not because they love metric meters and liters and grams and such. That's good. Let the free market decide, not some political hack or government clod with nothing else to do today.

On a more personal note, for many years I was the only person on my block who owned metric wrenches, feeler gauges, and such. When I was young guy I liked to do some of my own auto engine work. My first three cars were a beige Volkswagen Beetle (affectionately known as the "Bug" or the "V-Dub"), a red Karmann Ghia convertible, and a beautiful white Porsche 911S. Vrooom! All of these cars were made in Deutschland (Germany) and all were 101% metric. I still have an open end wrench from the tool set, 8 mm on one end and 13 mm on the other. Actualy I have two of these but I cut one in half so I could get into tighter spots in those nifty little air cooled engines.

Enough of this personal stuff. Let's get into the meat of the metric system.

What Is the Metric System?

The metric system is a decimal system of weights and measures in which the gram is the unit of weight, the meter is the unit of length, and the liter is the unit of volume.

These units are conveniently related:

  • one liter of water weighs 1,000 grams, a.k.a. one kilogram
  • one cubic meter contains 1,000 liters
  • one cubic meter of water weighs 1,000 kilograms.

1,000 kilograms is a metric ton, also known as a long ton. It weighs 2,200 pounds, 200 pounds more than an American ton.

Amounts greater or smaller than grams, meters, and liters are expressed by adding prefixes derived from Greek and Latin words for ten, hundred, and thousand. Thus you have:

Units Prefix Example
1000 kilo- one kilogram = 1000 grams
100 hecto- one hectoliter = 100 liters
10 deca- one decameter = 10 meters
0.1 deci- one decimeter = 1/10 meter
0.01 centi- one centiliter = 1/100 liter
0.001 milli- one milligram = 1/1000 gram

Additional prefixes are available for millions and billions but you won't see those on the store shelves, well, except in computer stores where everything is mega-, giga-, and tera- these days. You already know that.

The centi- prefix is one of the most common you will see and always means 1/100th of whatever. This is easy to remember because the American cent is 1/100th of a dollar. Cent shows up in many other places as well, such as century, centipede, centurion, centigrade, and cent, the French word for 100.


We seldom write out pounds and gallons but usually use lbs. and gals. Europeans do the same with metric units. Here are some common abbrs.:

  Weight Volume Length
kilo- kg kl km
hecto- hg hl hm
deka- dag dal dam
Basic Unit g l m
deci- dg dl dm
centi- cg cl cm
milli- mg ml mm

Using Metric

The conversion factors for the basic units into common American units are:

Basic Unit Conversion Factors
One gram equals 0.0352739 ounces
One liter equals 1.056710 quarts
One meter equals 3.280833 feet

Six place conversion factors are of little use to the traveler. You want to be able to relate quantities in the European units to American units in a flash. It's like learning a foreign language, but far easier because you don't need to learn any grammar.

Think in metric units, approximately. For example, consider the following conversions and the round off approximations in the next column:

Rounded Off Conversion Factors
Exact Conversion Factor Round Off
1 ounce 28.349527 grams 1 oz 30 g
1 kilogram 2.204619 pounds 1 kg 2 lb
100 grams 3.52739 ounces 100 g 1/4 lb
33 centiliters 11.15884 fluid ounces 33 cl 11 fl oz
1 liter 1.06573 quart 1 l 1 qt or ¼ gal
1 gallon 3.785332 liters 1 gal 4 l
1 inch 2.538998 centimeters 1 in 2½ cm
1 foot 30.48006 centimeters 1 ft 30 cm
1 meter 1.093611 yards 1 m 1 yd
1 mile 1.60931 kilometers 1 mi 1½ km

These approximations are close enough to get you through the day.

Familiar derivations of American units are also much different. For instance, automobile engine sizes in the USA are normally rated by cubic inch displacement. Europeans use liters. One liter equals 61 cubic inches. Our horsepower is equal to about ¾ of their kilowatt (KW) so if you see a car with a 100 KW engine that is about 134 HP to you. Americans use kilowatts to measure electricity, not automobile horsepower. For the tires, 30 psi equals approximately 2 atmospheres, 2 bars, and/or 2 kg/cm2. For you sailors, wind speed is measured in meters per second. Ten m/s equals 19 knots. On land, 10 m/s equals 22 mph.

Oops, one last conversion factor – 35 liters per bushel.

Metric Odds and Ends

The touted benefit of the metric system is that units are converted to higher or lower units of measure by factors of ten only. On the other hand, the American system has twelve inches to the foot, three feet to the yard, and many other divisions and multiples of units. One small absurdity of the metric system is that nobody uses many of the named units, e.g. dekagrams and decigrams. Hectograms are rarely used. I've only seen them in produce and fish markets in Italy.

Another problem with the metric system is the size of the basic unit of weight, the gram. The only place where it is at all meaningful is in the post office for weighing mail, but even there an ounce makes more sense than 28 grams. In Europe the maximum weight of an envelope for the minimum price is only 20 grams, about 30% less than in the USA. If you think that our postage rates are atrocious you will positively choke when you see what it costs to send a letter across the city of Paris or a postcard home. For more about the legacy postal system see Sending Snail Mail to & from Europe.

Most products in Europe are sold by the kilogram, kg. A kilogram is 1,000 grams and equal to about 2 pounds. But in Holland the word pond is used colloquially to mean 500 grams, slightly more than an American pound. The Germans have their Pfund and the French their livre to parallel the Dutch. There is obviously a practical need for a unit which is about equal to the American pound but the metric system has nothing to offer. The Dutch also use the word ons for 100 grams. However the translation of ons is ounce and that is only 28 grams, not 100.

I don't know if McDonald's will have to rename their quarter pounder. In metric it would be a 113.5 grammer.

International System of Units, SI

You may see the term SI in documents and scientific papers. This is the official name for the metric system. The SI abbreviation is derived from the French name, Systeme International.



America uses the Fahrenheit temperature scale. On this scale water freezes at 32oF and boils at 212oF.


The Centigrade temperature scale is used in Europe. It is also called the Celsius scale after its Swedish inventor. In Centigrade water freezes at 0oC and it boils at 100oC. That is a 100 degree span, thus our old friend centi- again.

Fahrenheit and Celsius temperatures can be converted back and forth with a simple algebraic expression. To convert Celsius to Fahrenheit multiply oC by 1.8 and add 32. To convert Fahrenheit to Celsius subtract 32 from oF and then divide by 1.8.

I know that is too much math for a few of you (I teach algebra so I know whereof I speak) and I seldom do it myself. Instead, keep some benchmarks in mind. Easy points to remember are:

Centigrade/Fahrenheit Conversion Table
oC -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 100
oF -4 5 14 23 32 41 50 59 68 77 86 95 104 212

You can see that for every span of five Centigrade degrees there is a span of nine Fahrenheit degrees, exact.

Key Temperatures

A good beach day would be 25oC. Normal body temperature of 98.6oF is equal to 37oC. The only temperature at which Centigrade and Fahrenheit are the same is 40o below zero. You won't find me in town when that happens.


When the metric system was introduced it also applied to time in France. After the Revolutionaries chopped off the heads of Louis and the Royals they moved forward. They decided to get rid of the old 60 seconds per minute, 60 minutes per hour, 24 hours per day, 7 days per week, and circa 52 weeks per year. It was all merde in their view because the Royals used it and made the prols use it.

The Revolutionaries went to a decimal time system. This featured 100 seconds per minute, 100 minutes per hour, 10 hours per day, and 10 days in a week.

Not all change is good. Napoleon Bonaparte used his emperor status and got that idiocy unhinged. France went back to the good old fashioned clock and calendar. I guess that the Revolutionaries would have had a better case if they had redefined the second as 13.6% less. Then the annual reckening would have been off by only 5 days but it would even out in the next year.


Have a good trip!


I welcome questions, comments, complaints, and compliments. If you have any concerns about your trip to Europe that have not been covered well enough on my web site please do not hesitate to write. Ask, cuss, discuss, or whatever. I read every email and update my pages when I see a question repeating, Then I will not get that question again, hopefully. In some cases readers have been so generous with their time and talent that I have included their emails verbatim, e.g. chapters 22 and 25.

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The two gallon size is excellent for packing your clothes. Keep things neat and dry in all conditions. Two gallon plastic ZipLoc bags Two gallon plastic bags
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Note: Italicized notations by the author.

The highlighted #E number for the items below is purely arbitrary. It is meant to help quickly identify products in this advert column when you write in for electrical advice.

This adapter is for the standard grounded plug in France, Germany, and northern Europe. It does not fit in outlets of Italy, Switzerland, Ireland, and Britain.
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You can use this ungrounded Euro plug in some European countries.
#E-020 Universal 2 in 1 Plug Adapter Universal 2 in 1 Plug Adapter
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4.0 mm prongs.
Equivalent to type C.

This is a universal plug for the UK and Ireland.
#E-030 Grounded Universal 2 in 1 Plug Adapter Type G England, Scotland, Wales, and Ireland AC Adapter Plug for use in England, Scotland, Wales, and Ireland
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Here is the Swiss version.
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Here is the grounded Italian model.
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This 110-250 volt power surge strip has three universal outlets and an American grounded plug so it needs a plug adapter for the countries you are visiting. Make sure your gizmos are rated for 110-240 volts.
#E-060 SM-60 Universal 3 Outlet Power Strip / Surge Protector for Worldwide Travel. 110V-250V with Overload Protection. SM-60 Universal 3 Outlet Power Strip Surge Protector for Worldwide Travel. 110V-250V with Overload Protection.
If your gizmos charge through a USB port this can keep you going. European cars have the same 12 volt system as American cars.
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This 50 watt 220/110 volt transformer is good for very small 110 volt appliances and light duty chargers.
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