Quick Summary: A standard packet of dry yeast (active dry or instant) holds 7 grams, which equals ¼ ounce, 2 ¼ teaspoons, or about ¾ tablespoon. This is true for name brands like Fleischmann's, Red Star, and SAF. If a recipe calls for one packet and you are measuring from a jar, use 2 ¼ teaspoons.
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What is yeast?
Yeast is of natural origin, composed of living beings called Saccharomyces cerevisiae, which belong to the fungi family. Yeast is used for making bread, brioche, yeasted blini, beer, etc.
The name "yeast" comes from the fact that these organisms cause bread dough to rise: they make it swell. But don't confuse baker's yeast with a leavening agent like baking powder or baking soda. These are "chemical yeast" used to make cakes.
How much yeast is in a packet?
Dry yeast (active and instant) is usually sold in small envelopes (packets) of three.
But how much yeast is in one packet? Does a standard yeast packet contain different amounts of the different types of yeast?
A package of yeast contains 7 g of yeast.
So, 2 packets of yeast contain 14 grams of yeast, and so on.
How much is active dry yeast in a packet?
One packet of active dry yeast contains 7 grams.
How much instant yeast is in a packet? Also, 7 grams.
How much yeast is in a Fleischmann packet?
A packet of Rapid Rise yeast contains 7 g of the product, too. The same goes for the sachet of Quick-Rise yeast.
How many ounces of yeast are in a packet? The answer is ¼ oz.
If the recipe calls for a packet of yeast and you only have a jar, how much yeast would you measure? You can measure it with teaspoons or tablespoons.
How many teaspoons are in a packet of yeast?
A package of yeast contains 2 ¼ teaspoons of yeast.
How many tablespoons are in a packet of yeast?
A pack of dry yeast (active or instant) measures ¾ tablespoon.
If you bake a lot of yeasted bakes, it makes sense to buy a jar of yeast. Otherwise, purchase a few packets, as yeast tends to lose potency, especially with active dry yeast.
Types of yeast
Four main types of yeast are baker's yeast, nutritional yeast, brewer's yeast, and wine yeast.
The type used in baking is called baker's yeast. But keep reading to know all the baker's yeast varieties!
Dry yeast
Active dry yeast
To make active dry yeast, manufacturers remove the water from live organisms.
This process makes fine-grained yeast that you can buy in small glass jars or as packets for brewing your own recipes with homemade ingredients.
Active dry yeast is dormant until dissolved in a small amount of warm water at 110°F (43°C).
You should always read the package directions. For example, some brands require that sugar be added at the same time as the yeast. Then you should add it to the other ingredients that cause the dough to rise.
Note: Always check the expiration date before using active dry yeast. Even with this step, the yeast's potency varies over time, leading to inconsistent baking results.
Instant dry yeast
Instant yeast is another type of dry yeast known since the 1970s. It is made the same way as active dry yeast, but is dried more quickly and milled into very fine particles.
Since this type of yeast is more delicate, it dissolves and works faster. In addition, instant yeast doesn't need to be activated in water; it can be added to the dry ingredients at the same time for mixing.
This type of yeast is highly stable, tolerates temperatures up to 130°F (54°C), and can be stored for several years by freezing.
The most common brands in the United States are SAF instant yeast and Dr. Oetker yeast.
Fast-acting instant yeast
It is instant yeast (as a subcategory of instant yeast), milled into smaller granules, and doesn't need to be activated in water.
It also contains some enzymes and other additives that make the dough rise faster.
So, using fast-rising yeast, you can shape your bread after kneading, skipping the first rise. This yeast is specifically designed to work with only one rise.
Fast-acting instant yeasts include RapidRise yeast by Fleischmann's brand and Quick-Rise by Red Star.
Bread machine yeast
Bread machine yeast is instant dry yeast that doesn't need to be activated before use. It is designed for use in bread machine recipes.
Here is a table comparing characteristics of dry yeasts.
| Characteristics | Active dry yeast | Instant dry yeast | Fast-acting yeast | Bread machine yeast |
|---|---|---|---|---|
| Stable | No | Yes | Yes | Yes |
| Consistent behavior | No | Yes | Yes | Yes |
| Tolerant of temperatures up to 130°F (54°C) | No | Yes | Yes | Yes |
| Works for recipes with two rises | Yes | Yes | ||
| Works for recipes with one rise | Yes | |||
| Suitable for cold-proofed doughs | Yes | Yes | No | Yes/No* |
Cake yeast
Cake yeast, also known as fresh, wet, or compressed yeast, is different from dry yeast: it is produced as a solid block.
One fresh yeast cake weighs 2 ounces (57 grams) in the U.S. and 1.48 ounces (42 grams) in Europe.
It has a shorter shelf life due to its high moisture content and should be refrigerated to maintain its leavening properties.
Fresh yeast should be dissolved in warm water or milk before adding to the dough ingredients.
Professional bakers prefer this type of yeast for its stronger flavor compared to dry yeast varieties.
How yeast works
Once the yeast is mixed into the dough, it ingests available sugars and converts them into ethanol and carbon dioxide (CO2). This process is called alcoholic fermentation.
Carbon dioxide takes up space, inflating the bread from the inside. It forms bubbles (the "holes" in the crumb of the bread).
Also, don't forget about gluten, which forms an elastic net in the bread dough. Therefore, kneading the dough allows gluten to develop.
During baking, CO2 released by the yeast cannot escape because the bread is a closed system. Thus, attracted by the surface, it goes to the surface of the bread.
It wields pressure on the gluten net, and the dough swells. The more yeast and sugar in bread dough, the better the dough will rise. Do you remember airy brioche from the bakeries?
How many packets of yeast do you need for baking?
First, I wouldn't recommend changing the amount of yeast in the recipe you follow if you are a beginner baker.
Second, if you have experience in baking, you probably know about the importance of the yeast-to-flour ratio.
Generally, one packet of active dry yeast should be used with one pound of flour, which equals about 4 cups or 454-500 grams.
As for fresh yeast, use 0.6 ounces (17 grams) for 4 cups of flour.
Here is a table to determine how much yeast you need based on your recipe's total flour amount.
| Flour in cups | Dry yeast | Fresh yeast |
|---|---|---|
| 4 cups | 1 packet | ⅔ oz. |
| 4-8 cups | 2 packets | 1 ⅓ oz. |
| 8-12 cups | 3 packets | 2 oz. |
| 12-16 cups | 4 packets | 2 ⅓ oz. |
| 16-20 cups | 5 packets | 3 ⅓ oz. |
In general, using less yeast in the dough is better than adding too much.
Once you add too much yeast to the dough, it affects the quality of the baked bread.
First, the bread may have irregular holes because the CO2 was produced over a short period. Or even worse, the bread may collapse.
Second, your bread may smell and taste like yeast.
If you add less yeast than the recipe requires, the dough will rise slowly, and according to home bakers, slower rises result in better bread flavor.
Yeast conversions
One of the most common questions among bakers is whether to substitute active dry yeast with instant yeast. Are they interchangeable?
The good news is that you can use a packet of instant yeast instead of one envelope of active dry yeast. They both contain 7 g of yeast.
The same works for fast-acting yeast. It is also sold in 7-gram packets and can be used as a substitute for active dry yeast.
Remember that instant and fast-acting yeasts don't need to be activated in water and work faster than active dry yeast.
Can you use cake yeast instead of dry yeast? A US block of cake yeast (2 oz.) is equivalent to three packets of dry yeast.
One-third of the fresh yeast block equals one packet of dry yeast.
Here is the yeast conversion chart.
| Cake yeast | Dry yeast in packets | Dry yeast in grams | Dry yeast in teaspoons |
|---|---|---|---|
| ⅔ oz. or ⅓ of a 2 oz. block | 1 | 7 g | 2 ¼ tsp |
| 1 ⅓ oz. or ⅔ of a 2 oz. block | 2 | 14 g | 4 ½ tsp |
| 2 oz. or one 2 oz. block | 3 | 21 g | 6 ¾ tsp |
| 2 ⅓ oz. or 1 ⅓ of a 2 oz. block | 4 | 28 g | 9 tsp |
| 3 ⅓ oz. or 1 ⅔ of a 2 oz. block | 5 | 35 g | 11 ¼ tsp |
How to proof or activate dry yeast
There are two ways you can tell if your yeast is still good.
The first one involves using the expiration date on the package, which indicates how long ago it was manufactured and when it should be used for optimal results.
If your yeast packet is open, there is also a yeast activity test that doesn't require any dating. Stir one packet of dry yeast, then wait 10 minutes.
The yeast is considered active if the foamy yeast mixture has risen to the 1 cup mark and has a rounded top.
It means the yeast is good and working, and could be used in your recipe.
How to measure yeast
Usually, measuring yeast is straightforward when the recipe calls for an envelope weighing 7 grams.
If you have a jar of dry yeast, measure the required amount of yeast with a teaspoon or tablespoon.
A single packet of yeast measures 2 ¼ teaspoons and ¾ tablespoon of product.
But what if you need to measure 1 or 2 grams of yeast?
Many digital kitchen scales, such as the Escali kitchen scale, provide weight readings in 0.1 oz. (1 g) increments. You can also succeed with a detailed task using a digital spoon scale.
But what is 1 gram of yeast in teaspoons?
1 gram of yeast is 0.35 teaspoons.
How to store yeast
You should store an unopened sachet of yeast in a cool and dry place, away from sunlight and temperature fluctuations.
Remember that active dry yeast is highly perishable. That is why always check the expiration date before use.
Even if the active yeast has not yet expired, it is highly recommended to verify its viability with a yeast activity test.
Opened envelopes of active dry yeast should be stored in an airtight container in the fridge or freezer.
Store opened instant yeast, including Fleischmann's yeast and bread machine yeast, in an airtight container in the refrigerator, or freeze it.
Cake yeast should always be refrigerated to keep its potency. Store it in an airtight container in the fridge for up to 2 weeks or freeze it for up to three months.
FAQ
Which type of yeast should you use?
There is no single correct answer. Instead, choose one kind of yeast and test it. For a beginner baker, SAF instant yeast often works best, thanks to its shelf life, stability, and versatility.
Can you use expired yeast?
Expired yeast that has lost its potency will not reliably raise dough. It may look active at first, but you need yeast that is strong enough to give your dough a good rise.
How long does a yeast packet last?
Always check the expiration date printed on the packet. Active dry and instant yeast have a shelf life of about two years when stored properly. Run a quick yeast activity test before using it.
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