# Our friend the metric system

## Converting between American and metric measurements: miles and kilometers, feet and meters, pounds and kilos, gallons and liters, Fahrenheit and Celsius (plus a few others)

Remember back in the 1970s when we were all going to go on the metric system? What ever happened to that? Oh, yes: Reagan.

Whether you need to figure out how far 150km is in miles (93), how many centimeters in a foot-long hot dog (30cm), how to order a half a pound of cheese for your picnic (225 grams), or just how ridiculously hot 40° Celsius is so you can complain in your postcards home (105° F), here are the answers.

If you're wondering what your size 12 American body is to that little black dress in a Paris boutique (now don't faint, but here you're a size 42), or whether your size 10 feet need a 35 or a 55 in a handcrafted Italian leather shoe (neither; you’re a 44), that's all on a different page of clothing sizes.

### You say kiLOMeter, I say KILometer

At least these are easy enough to do in your head. A kilometer (km) is equal to 0.62 miles, and a mile is 1.61 km.

 Km Miles 1km 0.62mi 2km 1.24mi 3km 1.86mi 4km 2.46mi 5km 3.11mi 6km 3.37mi 7km 4.35mi 8km 4.97mi 9km 5.59mi 10km 6.21mi 50km 31.07mi 100km 62.14mi
 Miles Km 1mi 1.61km 2mi 3.22km 3mi 4.83km 4mi 6.44km 5mi 8.05km 6mi 9.66km 7mi 11.27km 8mi 12.88km 9mi 14.48km 10mi 16.09km 50mi 80.47km 100mi 160.9km

OK so it's not THAT easy. Still, doing a rough calc in your head isn't that hard. For kilometers to miles, just break it into two bits: 50% plus 10% (which totals 60%, or 0.60), then round up a smidgen for that extra 2% (the 0.02).

That sounds more complicated than it is: The road signs says Siena is 80 km away. OK, so to get 50% you just cut that in half, which is 40. Tuck that away in a crevice of your cerebellum for a moment.

Now take 10% of the original 80—which is 8—then add that to the 40 and you get 48. Round up "a smidgen" to cover that extra 2% and you get 50. That means 80 km is roughly 50 miles (actually, it's 49.6, so close enough). Here, I'll make it easy for you with the table up to the right.

Frankly, you'll rarely ever need to convert the other way, unless you want to say to someone in Europe something along the lines of "I live 20 miles outside of Boston," only put it in kilometers terms so he understands where your suburb is. No biggie. Ten miles is about 16 kilometers, so tell him you live 32 km from Boston. (This is assuming, of course, he has more than a vague sense of where Boston is in the first place.) That cheat sheet is also above to the right.

### The yardstick by which meters are measured

Thank heavens for the yardstick. You can point with it, you can rap people in the knuckles with it, you can even measure stuff with it, so long as the stuff in question is less than three feet long.

And it's also about one meter long, so just picture a yardstick and you know what a meter looks like. Well, roughly.

Actually, 1 meter is 3.3 feet—a bit longer than a yard. So 10 meters is equal to 33 feet, or 11 yards, which is enough for a first down (only they play soccer in Europe, so that little joke wouldn't work). 100 meters is 330 feet (or 110 yards), 1,000 meters is 3,300 feet (or 1,100 yards). One thousand meters is also 1 kilometer, which is 0.62 miles; see above.

### Give a man an inch, he'll take about two and half centimeters

 Cm Inches 1cm 0.4in 2cm 0.8in 3cm 1.2in 4cm 1.6in 5cm 2in 6cm 2.4in 7cm 2.8in 8cm 3.2in 9cm 3.6in 10cm 3.9in 11cm 4.3in 12cm 4.7in
 Inches Cm 1in 2.54cm 2in 5.08cm 3in 7.63cm 4in 10.16cm 5in 12.70cm 6in 15.24cm 7in 17.78cm 8in 20.32cm 9in 22.86cm 10in 25.40cm 11in 27.94cm 12in 30.48cm

I can't think of a time when I've had to use inches or centimeters in any discussion in Europe, much less needed to convert between the two, but just to be thorough:

One inch is equal to 2.54 centimeters (make it two and a half).

One cm is 0.4 inches.

That means 12 inches is 30.48 cm (just pretend it's 30). We call that "a foot," but Europeans don’t have a separate word for something of that length; they'd just say "30 centimeters" or maybe "a third of a meter."

Then again, since they don’t eat hot dogs (just würstel), I guess they don't need a term for foot-long.

### A gram of prevention is worth a kilo of cure

 Pound Kg 1lb 0.45kg 2lb 0.91kg 3lb 1.36kg 4lb 1.81kg 5lb 2.27kg 6lb 2.72kg 7lb 3.18kg 8lb 3.63kg 9lb 4.08kg 10lb 4.54kg 50lb 22.68kg 100lb 45.36kg
 Kg Pound 1kg 2.21lb 2kg 4.41lb 3kg 6.61lb 4kg 8.82lb 5kg 11.02lb 6kg 13.23lb 7kg 15.43lb 8kg 17.46lb 9kg 19.84lb 10kg 22.05lb 50kg 110.23lb 100kg 220.46lb

Unlike the U.S., where only cocaine ever comes in kilos, in Europe you'll be ordering lots of (perfectly legal) things by the "key."

Actually, when it comes to food you'll more frequently order by the gram, because who needs 2.2 pounds (1 kilo) of anything?

Conveniently enough, 100 grams is just about the perfect amount, per person, of cheese, salamis and other cured meats, fruit, or whatever else you desire in putting together a picnic. Heck, it's so perfect the Italians even have a special term for 100 grams: un etto.

No, you don't order a "112.5-grammer" at McDonald's in Europe; they know what a "Quarter Pounder" is. However, if I catch any of you giving into temptation and ducking into that McDonald's while you're in a foreign country, so help me I'll verbally thrash you to within an inch...er, 2.54 centimeters...of your greasy fries-addicted life.

Actually, this point was brought up by a greengrocer arrested in Britain a few years ago when jolly old England finally decided to crack down and force feed the metric system to its people. The bloke was still selling his bananas by the pound, not the kilo, at a local market so he was hauled off and fined.

The jovial fellow became something of a minor cause cèlèbre, the "Metric Martyr," and was fond of pointing out the hypocrisy that they would persecute a small fry like him when McDonald's was left to flagrantly flout the new laws by refusing to rename the Quarter Pounder.

### Wine is not sold by the quart

 Gal Liter 1gal 3.79L 2gal 7.57L 3gal 11.53L 4gal 15.14L 5gal 18.93L 6gal 22.71L 7gal 26.50L 8gal 30.28L 9gal 34.16L 10gal 37.94L 50gal 189.7L 100gal 379.4L
 Liter Gal 1L 0.26gal 2L 0.53gal 3L 0.79gal 4L 1.06gal 5L 1.32gal 6L 1.58gal 7L 1.85gal 8L 2.11gal 9L 2.38gal 10L 2.64gal 50L 13.2gal 100L 26.4gal

Actually, it kinda is—sold by the quart, that is.

One liter equals roughly a quarter of a gallon (i.e. a quart). Not that you'll catch any Italian or Frenchman using such a barbarous term. No, they drink wine by the liter over there, that you very much—which may explain why they're so happy much of the time.

OK, so bottles of wine are actually usually 0.75 liters, not full liters, but let's not quibble.

If that's too much vino for your blood, you can always order table wine by the half-liter (about four glasses-worth, called un demi in French and mezzo litro in Italian) or quarter-liter (two glasses; un quart in French, un quartino in Italian).

### You give me fever

 ° F ° C 32 0 40 5 50 10 60 15 65 18 70 20 75 25 80 27 85 30 90 32 95 35 100 38

Tell a doc in Italy that you're running a fever of 102°, and he won't believe you—because 102° Celsius is equivalent to 216° Fahrenheit, which means your brain would be fried faster than that egg in the old "...this is your brain on drugs" commercial.

And if the local news reports that tomorrow's temperature will be around 32°, that's means it'll shorts and T-shirt weather, not down parka time—32° degrees Celsius is 90° Fahrenheit.

The bad news: there is no simple formula to convert Celsius to Fahrenheit and back. There is a formula, of course, but it ain't the sort of thing you'd want to do in your head. Take the Celsius amount, multiply it by 1.8, then add 32. See, wasn't that easy?

If math is one of the things you're taking a vacation from, the chart on the right can help you ballpark things.

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This article was by Reid Bramblett and last updated in April 2011.
All information was accurate at the time.