Convert between active dry yeast, instant yeast, fresh yeast, and bread machine yeast with ease. Enter your amount, choose a unit (teaspoons, tablespoons, grams, or ounces), select your source yeast type and target yeast type, and get the exact equivalent quantity you need for your recipe. Also try the Fresh to Dry Herb Conversion Calculator.
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Active dry yeast contains larger granules and must be dissolved ('proofed') in warm water before use to activate. Instant yeast (also called rapid-rise or quick-rise yeast) has finer granules and can be mixed directly into dry ingredients without proofing. Because instant yeast is more potent, you need about 25% less of it compared to active dry yeast — for every teaspoon of active dry yeast, use roughly 3/4 teaspoon of instant yeast. See also our Sugar Substitute Calculator.
Fresh (compressed) yeast is much more moist than dried forms, so you need significantly more of it to achieve the same leavening power. As a general rule, use 3 times the amount of fresh yeast as instant yeast, or about 2.5 times the amount of active dry yeast. For example, if a recipe calls for 1 teaspoon (3 g) of instant yeast, you would substitute approximately 9 g of fresh yeast.
One standard packet (envelope) of yeast sold in the US contains approximately 2¼ teaspoons, or about 7 grams (¼ oz) of active dry or instant yeast. This amount is typically enough to leaven up to 4 cups of flour. Most recipes call for one packet when they specify '1 package' of yeast.
Yes — bread machine yeast and instant yeast are essentially interchangeable in a 1:1 ratio. Bread machine yeast is simply instant yeast marketed specifically for use in bread machines, and it may contain ascorbic acid as a dough conditioner. You can use either type in bread machines or standard recipes without adjusting the quantity.
The conversion depends on the yeast type. For active dry yeast, 1 teaspoon weighs approximately 3.1 grams. For instant yeast, 1 teaspoon is about 3.1–3.3 grams. For fresh yeast, 1 teaspoon is roughly 4–5 grams because of its higher moisture content. Divide the gram amount by the weight-per-teaspoon value for your yeast type to get the equivalent in teaspoons.
Baker's yeast (active dry, instant, or fresh) is used as a leavening agent in baking — it produces carbon dioxide gas that makes dough rise. Brewer's yeast is a byproduct of beer production and is primarily used as a nutritional supplement; it is not suitable as a leavening agent because it has lost its leavening ability after fermentation. They should not be substituted for one another in baking.
Yes. Instant yeast is best for quick breads and recipes where you want to skip the proofing step. Active dry yeast is reliable for traditional bread recipes and works well when the dough has a longer first rise. Fresh yeast is preferred by professional bakers for its rich flavor and strong leavening, but it has a very short shelf life (1–2 weeks refrigerated). Bread machine yeast is optimized for the temperature and timing cycles inside bread machines.
One quarter ounce (0.25 oz) of yeast is approximately 7 grams, which equals roughly 2¼ teaspoons of active dry or instant yeast. This is exactly the amount found in one standard US yeast packet, and it is sufficient for most single-loaf bread recipes.