Yeast Substitution Calculator
Not every baker keeps all yeast types on hand, and recipes do not always specify the same type you have available. Fortunately, active dry yeast, instant yeast, rapid rise yeast, and fresh compressed yeast are all interchangeable with the right conversion ratios. Instant yeast (and rapid rise yeast, which is essentially the same product) is more concentrated than active dry yeast, containing more live yeast cells per gram and having a finer texture that activates without pre-dissolving. The standard ratio is 1 teaspoon of active dry yeast to 0.75 teaspoons of instant yeast. Fresh yeast is the least concentrated of the three because it contains significant moisture: 1 teaspoon of active dry yeast equates to approximately 2.5 teaspoons of fresh yeast. These ratios are established baking standards used by professional bakers and recipe developers worldwide. Select your starting yeast type, enter the amount called for in your recipe, then choose the yeast type you want to substitute. The calculator instantly shows the equivalent amount to use.
Yeast conversion table
| Active dry (tsp) | Instant (tsp) | Fresh (tsp) |
|---|---|---|
| 0.25 | 0.19 | 0.63 |
| 0.50 | 0.38 | 1.25 |
| 1.00 | 0.75 | 2.50 |
| 2.00 | 1.50 | 5.00 |
| 2.25 (1 packet) | 1.69 | 5.63 |
| 3.00 | 2.25 | 7.50 |
One standard US packet of active dry or instant yeast contains 2.25 teaspoons (approximately 7 grams).
Yeast substitution: frequently asked questions
What is the ratio of active dry yeast to instant yeast?
Instant yeast is more concentrated than active dry yeast because it has a finer texture and more live cells per gram. The standard substitution ratio is 1 teaspoon of active dry yeast equals 0.75 teaspoons of instant yeast. Conversely, if a recipe calls for instant yeast, multiply by approximately 1.33 to get the active dry equivalent.
How do I substitute fresh yeast for active dry yeast?
Fresh yeast (also called cake yeast or compressed yeast) is much less concentrated than dry yeast because it contains a high percentage of water. The standard conversion is 1 teaspoon of active dry yeast equals approximately 2.5 teaspoons of fresh yeast (or about 8 to 9 grams). Fresh yeast should be dissolved in warm water before adding to a recipe.
What is the difference between instant yeast and rapid rise yeast?
Instant yeast and rapid rise yeast are essentially the same product. Both are finely milled, require no proofing, and can be mixed directly into dry ingredients. Some brands market rapid rise yeast for single-rise recipes and may add ascorbic acid to further speed fermentation. The two can be substituted one-for-one.
Do I need to proof active dry yeast before using it?
Traditionally, active dry yeast is proofed in warm water (about 38 to 43 degrees C) with a small amount of sugar for 5 to 10 minutes before using, to confirm it is alive. Modern active dry yeast can generally be added directly to dry ingredients without proofing, though proofing provides extra assurance especially when yeast is close to its expiry date.
Can I substitute fresh yeast for instant yeast directly?
Yes. Fresh yeast can replace instant yeast. The ratio is approximately 1 teaspoon of instant yeast equals 3.33 teaspoons of fresh yeast. Fresh yeast is highly perishable and must be refrigerated. It produces a slightly richer flavour in some bakers' opinions, and is common in professional bakeries. Dissolve fresh yeast in the liquid called for in the recipe before combining with other ingredients.
References
- USDA Agricultural Research Service: FoodData Central.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.