Units of Measure by weight and by volume

US fluid Units of Measure (by volume/capacity)
drop100.03850720011416 drops = 1/8 teaspoon
teaspoon104.9289216145863 teaspoons = 1 tablespoon
tablespoon114.7867648437591 tablespoon = 3 teaspoons
ounce (fluid)129.5735296875171 cup = 8 ounces
cup336.5882375001361 cup = 16 tablespoons
pint573.1764730000001 pint = 2 cups = 16 fluid ounces
pint (dry)650.6104713575001 dry pint = 33.6003125 cubic inches
quart1046.3529500005441 quart = 4 cups
liter1100.0000000000001 liter = 0.264 gallons = 61.024 cubic inches
quart (dry)1201.2210000000001 dry quart = 67.2006 cubic inches
gallon3885.4117800000001 gallon = 128 fluid ounces
gallon (dry)4504.8837708600001 dry gallon = one-eighth of a bushel
peck8909.7680000000001 Peck = 8 Dry Quarts = 537.6 cubic inches
bushel35339.0701668800001 US bushel = 1.24445608 cubic feet
Dry Units of Measure (by weight)
ounce (dry)128.349523100000 
pound553.5923696000001 pound = 16 dry ounces

Measurements are based on either weight, or volume (capacity). There is no specific conversion between weight and volume unless you know the density of the ingredient. However, water, at 4 °C, is often used as a standard to derive the weight of a volume specification. For example, one cup of water (at 4 °C) weighs 236.588 grams. A cup of popcorn, of course, weighs much less (8 grams). Here is the USDA list of Food Item Densities for one cup of selected food items.

Both liquid measure and dry measure have the same volume.

For the most precise measurements, weigh all ingredients with a scale.

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