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Convert between active dry yeast, instant yeast, fresh cake yeast, and sourdough starter. Get exact gram and teaspoon equivalents with usage tips.
Yeast conversion is the process of calculating equivalent amounts when substituting one type of baking yeast for another. Active dry, instant, fresh (cake), and sourdough starter each have different potency levels requiring ratio adjustments.
| Active Dry | Instant | Fresh |
|---|---|---|
| 1 packet AD (7g) | 5.25g (1¾ tsp) | 17.5g (⅔ oz) |
| 2 tsp AD (6.2g) | 4.7g (1½ tsp) | 15.5g |
| 1 tbsp AD (9.3g) | 7g (2¼ tsp) | 23.3g |
Formula
Instant = Active Dry × 0.75 | Fresh = Active Dry × 2.50.75 = instant yeast is ~25% more potent than active dry
2.5 = fresh yeast is ~40% as potent as active dry by weight
Worked Example
Convert 7g active dry yeast to instant
Did you know? Active dry yeast was developed by Fleischmann's during World War II to provide a stable, shelf-stable yeast for military rations. Before that, bakers relied exclusively on fresh cake yeast or wild sourdough cultures (source: Smithsonian Institution).
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