Looking at the box is the most common way. A normal box of spaghetti pasta is usually a pound. Most recipes are referring to the dry weight, the weight before they are cooked.
A cup and an ounce measure different things. A cup is a measure of volume, while an ounce is a measure of weight. Generally speaking, dry spaghetti (or most any dry pasta) will double in size when you cook it. I'd estimate that if you cook 2 ounces of dry spaghetti, you will get roughly one cup cooked spaghetti.
To find the unit rate comparing the number of ounces of tomatoes to ounces of spaghetti, divide the number of ounces of tomatoes by the number of ounces of spaghetti. For example, if you have 12 ounces of tomatoes and 8 ounces of spaghetti, the unit rate would be 12 ounces of tomatoes / 8 ounces of spaghetti = 1.5. This means there are 1.5 ounces of tomatoes for every ounce of spaghetti.
A serving size of spaghetti is considered to be 1/4 to 1/2 cup. Since you can not measure spaghetti in a measuring cup let's switch to ounces. 1/4 of a cup of dry spaghetti is 2 ounces, once cooked it measures about 4.5 ounces. So to get enough cooked spaghetti for 1 serving per person, for 20 people you need 20 about 20 ounces of dry spaghetti, or 1.25 lbs. 1.25 lbs of dry spaghetti will cook into approximately 2.8 lbs of cooked spaghetti, which is 45 ounces. 45 ounces which is roughly 5.6 cups, and 5.6 cups divided into 1/4th cup servings of cooked spaghetti gives you about 22 servings. If you feel people are going to want more than 1 serving then cook up another half pound of spaghetti to be safe.
To determine how many pounds of spaghetti pasta you need for 350 servings of 1 cup each, consider that 1 cup of cooked spaghetti weighs about 7 ounces. Therefore, for 350 servings, you would need approximately 2,450 ounces (350 cups x 7 ounces). Since there are 16 ounces in a pound, this equates to about 153 pounds of cooked spaghetti. Keep in mind that pasta typically doubles in weight when cooked, so you would need around 76.5 pounds of dry spaghetti to achieve this amount.
7 fluid ounces approx. = 22 one hundredths of a gallon
You must name the pasta, there are dozens of kinds and all weigh different. For example, a cup of spaghetti,all standing upright and closely fitted in a cup is 3 times the weight of rotini
Four ounces of dry spaghetti will make two cups when cooked.
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Two ounces of cooked spaghetti is approximately 0.5 cups. The measurement can vary slightly depending on how tightly the spaghetti is packed, but generally, 2 ounces of cooked pasta is considered to yield about half a cup.
spaghetti
896 oz 1 gallon makes 128 ounces and 1 ounce is 0.0078 gallon in U.S measure. There are 8 ounces in a cup, 2 cups in a pint, 2 pints in a quart and 4 quarts in a gallon. That makes 128 ounces in a gallon US. In UK 20 ounces to the pint, 8 pints to the gallon which makes 160 ounces Imperial measure.