If volume - 1 US teaspoon = 0.17 ounces US<br />If weight - it depends of the density of your foodstuff. For example<br />1 US teaspoon of water = 0.17 oz<br />1 US teaspoon of buckwheat = 0.15 oz<br />1 US teaspoon of honey = 0.23 oz and so on.
Comparison of Letter (shaded light blue) and Government letter sizes with some similar paper and photographic paper sizes. Letter or US Letter is a paper size commonly used as home or office stationery in Canada, the United States, Mexico and the Dominican Republic. It measures 8.5 by 11.0 inches (215.9 by 279.4 mm). US Letter size paper is a standard defined by the American National Standards Institute (ANSI), in contrast to the A4 paper used by all other nations, which is defined by the International Organization for Standardization (specifically, in ISO 216).
The above chart is a quick reference guide to international standard (A4) and U.S. paper sizes. In the international community, the most frequently used paper size is A4. An A4 document compared to a standard U.S. Letter document has more height and a little less width. For a detailed explanation about International paper sizes, Markus Kuhnâs article International Standard Paper Sizes is a great resource.