Baking
Instant Yeast Conversion
Instant Yeast weighs 150g per US cup.
Conventionally measured by the teaspoon or packet (1 packet = 2¼ tsp ≈ 7g).
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 150.0 g | 5.29 oz |
| 1/2 cup | 75.0 g | 2.65 oz |
| 1/4 cup | 37.5 g | 1.32 oz |
| 1 tbsp | 9.4 g | 0.33 oz |
| 1 tsp | 3.1 g | 0.11 oz |
| 100 g | 100.0 g | 3.53 oz |
Need a different amount? Use the full Ingredient Converter tool.
150 grams per cup is a useful number for a spreadsheet, not a mixing bowl — instant yeast is portioned by the teaspoon or the packet (a standard packet runs about 2¼ teaspoons, roughly 7 grams), and a cup-sized dose in an actual dough would overwhelm it with an inedible, overproofed mess.
"Instant" describes a real functional difference from active dry yeast, not just a marketing name: instant yeast's smaller granules and different drying process let it be mixed directly into a recipe's dry ingredients without first dissolving it in warm water, since it rehydrates fast enough during normal mixing to activate reliably on its own.
Instant yeast is also sold under the names "rapid-rise" and "bread machine yeast" — genuinely the same product formulated the same way, just marketed for different audiences, so a recipe calling for any of those three names can safely use whichever one of them is actually on hand.
Instant yeast's fine, uniform granules pack slightly more densely into a cup (160g) than active dry yeast's coarser granules (150g/cup) — a modest weight difference that matters less in practice than the two products' different handling requirements, covered in full in this site's dedicated instant-vs-active-dry-yeast guide.
Because instant yeast can be mixed directly into a recipe's dry ingredients, many bread-machine recipes are written specifically around it — substituting active dry yeast into a bread machine recipe without proofing it first is one of the more common causes of an unexpectedly dense loaf.
Both types are living organisms and lose potency past their printed date, so a proofing test is worth doing on an older jar regardless of type.
It keeps its potency in the freezer for well over a year if sealed tightly, longer than most home bakers actually need.
Frequently asked questions
Do I need to dissolve instant yeast in water before using it?
No — that's the whole advantage of instant yeast's finer, more porous granules; you can stir it straight into the flour and other dry ingredients and it'll still activate reliably, unlike active dry yeast, which does better proofed in warm water beforehand.
Is instant yeast the same as rapid-rise or bread machine yeast?
Yes — these are the same product under different marketing names, all describing yeast processed with a finer granule structure meant to be mixed directly into dry ingredients without a separate proofing step.
Can I substitute instant yeast for active dry yeast 1:1?
Close to it — instant yeast is generally used at a slightly lower quantity or with a somewhat faster rise than active dry yeast in the same recipe, but many home bakers use them interchangeably without dramatic results either way.
Does instant yeast go bad?
Yes — yeast is a living organism (dormant, not active, in dry form) and does lose potency over time, especially once opened; if a recipe isn't rising as expected, testing a spoonful in warm water with a pinch of sugar (it should foam within about 10 minutes) is a reliable check.
Should instant yeast be refrigerated or frozen for storage?
Refrigerating or freezing an opened package meaningfully extends its active shelf life beyond what pantry storage alone provides, since yeast is a genuinely living, dormant organism whose viability slowly declines with time and warmth.