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Let's have a single question giving the conversion between cups, ounces, teaspoons, and gallons, just to have one convenient reference.

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9 Answers

up vote 7 down vote accepted

US Measurements:

  • 1 tbsp = 3 tsp
  • 1 oz = 2 tbsp
  • 1 cup = 8 oz
  • 1 quart = 4 cups
  • 1 gallon = 4 quarts

Metric conversion:

  • 1 oz ~ 30 mL (29.57 exact)
  • 1 cup ~ 240 mL (236.59 exact)
  • 1 L ~ 1 qt (1.06 exact)
  • 1 oz = 28.4 g
  • 1 kg = 2.2 lbs
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In the UK a cup is 10 fluid ounces, rather than 8, i.e. it is half a pint (20 fluid ounces in the UK). Some older UK cookbooks use the measurement and a lot of cups that one can buy are also this size, so its a useful one. It also means that 1 quart = 4 cups on both systems. –  Francis Davey Jul 29 '12 at 19:23
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Use Google. http://www.google.com/search?q=1%20cup%20in%20tbsp

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Yeah, Google is awesome for this. Has a wide variety of conversions. google.com/search?q=hbar+in+slug+acres+per+fortnight –  ceejayoz Jul 12 '10 at 22:12
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If you've got an iDevice, there are some great iOS apps for unit conversion. I especially like ConvertBot (iTunes), although Convert (iTunes) has more units/categories.

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Upvoted, but a webpage reference would have been even better :) –  cyberzed Jul 9 '10 at 19:44
    
@cyberzed touché. edited answer. –  Dave DeLong Jul 9 '10 at 19:47
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I'm going to recommend http://www.wolframalpha.com which has pretty much any conversion ever conceived of. They also have great nutritional information.

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+1 wolfram alpha is a great site, like google for data. I use it for physics and chemistry information, but had never considered using it for cooking. –  David Aug 21 '11 at 17:25
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From wikipedia:

  • teaspoon (tsp): 1/6 ounce
  • tablespoon (tbsp): 3 tsp, 1/2 oz
  • fluid ounce (fl oz): 2 Tbsp, 1 oz
  • jigger (jig): 3 tbsp, 1.5 oz
  • cup (c): 16 tbsp, 8 oz
  • pint (pt): 2 c, 16 oz ("A pint's a pound the world around" - both have 16 ounces.)
  • quart (qt): 2 pt, 32 oz
  • gallon (gal): 4 qt, 128 oz
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Wait what? I always thought "a pint's a pound..." was referring to H20. –  Preston Fitzgerald Dec 30 '13 at 3:55
    
I just spent way too much time and brainpower reading about the differences between US and UK volume measurements. I hate my life. We really do need to step up our metric system game. This is ridiculous. –  Preston Fitzgerald Dec 30 '13 at 3:56
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Found this to be very helpful:

enter image description here

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If you are serious about cooking, buy some of the measuring cups with multiple different scales, similar to this one:

measuring cup

Not only you will not have to convert the units, because many of the cups have both US and metric scales, but you avoid weighting flour, sugar etc. Real time saver.

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I cannot agree here. Weighing sugar and flour is far faster and more accurate than volumetric measurement. –  SAJ14SAJ Mar 12 at 0:09
    
The accuracy of weight is undisputable, the speed is up for discussion. But my idea here was, looking at the talbes above, this can provide you with a nice conversion table without the need to have some extra paper pinned on fridge or something. –  Petr Mar 12 at 0:33
    
Nice idea, although in my experience, this does not work well. It's very hard to match the line (harder than working with cups). I usually use a cup, weigh it and use that for future reference. –  Mien Mar 12 at 10:36
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There already is a single reference. :)

Just open bing.com and type what you're trying to convert. For example, to convert teaspoon to cup.

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A site I have used for years for converting units of speed, length, area, volume, weight... everything you can think of is www.onlineconversion.com.

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