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How Much Yeast Is in a Packet?
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A standard packet of yeast contains 2¼ teaspoons, which is 7 grams or ¼ ounce (0.25 oz).
That's the same for active dry yeast, instant yeast, and rapid-rise/bread machine yeast — all three are sold in identical ¼ oz packets, usually in strips of three.
All the equivalents for one packet:
| Measure | Amount |
|---|---|
| Teaspoons | 2¼ tsp |
| Tablespoons | ¾ tbsp |
| Grams | 7 g |
| Ounces | ¼ oz (0.25 oz) |
| Millilitres (volume) | about 11 mL |
How much does a packet raise? One packet is enough for roughly 4 cups of flour, or about 2 standard loaves of bread. Most home bread recipes call for exactly one packet, which is why they're sold this way.
Using yeast from a jar instead: just measure out 2¼ teaspoons wherever a recipe says "one packet." Jarred yeast is the same product in bulk and is considerably cheaper if you bake often. Keep an opened jar sealed in the fridge (up to about 4 months) or the freezer (up to 6 months) — yeast is a living organism and loses potency at room temperature.
Converting between yeast types:
| From | To | Conversion |
|---|---|---|
| Active dry | Instant | Use 25% less instant (≈ 1¾ tsp per packet) |
| Instant | Active dry | Use 25% more active dry |
| Dry yeast (1 packet) | Fresh/cake yeast | About 17–21 g (roughly a 0.6 oz cake) |
| Fresh yeast | Dry yeast | Divide the weight by about 3 |
In practice, many bakers substitute active dry and instant 1:1 and simply accept a slightly different rise time — it rarely ruins a loaf.
The practical difference between the types:
- Active dry yeast traditionally needs proofing — dissolving in warm liquid (105–110°F / 40–43°C) with a pinch of sugar for 5–10 minutes until foamy. Modern active dry is finer than it used to be and can often be mixed straight in, but proofing also tests whether it's still alive, which is worth doing.
- Instant yeast (also sold as rapid-rise or bread machine yeast) can be mixed directly into the dry ingredients with no proofing, and generally rises faster.
- Fresh yeast is crumbled into the dough, is highly perishable, and is mostly used by professional bakeries.
How to check if your yeast is still good: stir 1 teaspoon of yeast and 1 teaspoon of sugar into ¼ cup of warm water (about 110°F). After 10 minutes it should be visibly foamy and smell yeasty. If nothing happens, it's dead — throw it out, because no amount of rising time will save the dough.
Two common mistakes:
- Water that's too hot. Above about 120°F (49°C) you start killing the yeast, and above 140°F you kill it outright. Warm to the touch, not hot.
- Salt in direct contact with yeast. Salt inhibits yeast, so mix it into the flour rather than dumping it onto the yeast.
A note on measuring: yeast is one ingredient where a kitchen scale helps, since 7 g is precise while a heaped teaspoon isn't. But for a single loaf, 2¼ level teaspoons is close enough.