Yeast Conversion Calculator
Recipe calls for a yeast type you don't have? Convert between active dry, instant, and fresh yeast by weight.
Standard conversion ratios
| From | To | Multiply by |
|---|---|---|
| Active dry | Instant | 0.75 |
| Instant | Active dry | 1.33 |
| Active dry | Fresh | 2.0 |
| Fresh | Active dry | 0.5 |
Commonly cited baking-industry ratios; exact potency varies somewhat by brand and yeast age.
Why the three types aren't used in equal amounts
Instant yeast is more concentrated and doesn't need proofing in warm water first, so a recipe needs less of it than active dry yeast to get the same rise — roughly 25% less by weight. Fresh (cake) yeast is the least concentrated of the three, since it's still mostly moisture, so it takes about twice the weight of active dry yeast to match the same leavening power.
Active dry and instant are mostly interchangeable in practice
Many bakers use active dry and instant yeast interchangeably 1:1 without noticing much difference for everyday baking — the 25% adjustment matters more in recipes sensitive to exact fermentation timing, or in professional/commercial baking where consistency across batches counts. For a weeknight loaf, close enough is usually fine.
Fresh yeast has the shortest shelf life by far
Fresh yeast typically lasts only 2–3 weeks refrigerated, versus months for active dry or instant in a sealed package — if a recipe calls for fresh yeast and you're substituting dry, you're also trading away that faster spoilage, which is one of the practical reasons dry yeast dominates home baking today.