Convert small amounts precisely.
One level teaspoon (5 mL) holds: sugar 4.2g, salt 6g, baking powder 3g, baking soda 3.5g, cinnamon 2.6g, vanilla extract 4.2g, yeast 3.5g. For leaveners, accuracy is critical — even ½ tsp too much baking soda can make baked goods taste soapy and cause collapse. Diamond Crystal kosher salt weighs only 3g/tsp while Morton's weighs 5g/tsp and table salt 6g/tsp — a recipe calling for "1 tsp salt" can vary by 100% depending on the type. This is why professional recipes specify salt by weight. One teaspoon = ⅓ tablespoon = ~5 mL. A "pinch" is roughly ⅛ teaspoon (0.3-0.5g for most spices).