Yeast Converter
Convert between fresh yeast, active dry yeast, and instant yeast. Standard conversion ratios built in — no guesswork needed.
Standard ratio
Refrigerate, short shelf life
Needs blooming in warm water
Mix directly with flour
Yeast Conversion Guide
How do I convert fresh yeast to dry yeast?
Divide the fresh yeast amount by 3. For example, 30g fresh yeast = 10g active dry or instant yeast. The standard ratio is 3:1 (fresh:dry).
Is active dry yeast the same as instant yeast?
They are interchangeable 1:1 in most recipes. The main difference is how you use them: active dry yeast should be dissolved in warm water first (bloomed), while instant yeast can be mixed directly with dry ingredients.
Can I substitute instant yeast for fresh yeast in sourdough?
Yes. If a recipe calls for fresh yeast and you only have instant, use 1/3 of the amount. However, note that sourdough traditionally relies on natural leavening from a starter.
How can I tell if my yeast is still active?
Proof it: dissolve 1 tsp sugar in 1/4 cup warm water (38-43°C / 100-110°F), sprinkle yeast on top. After 5-10 minutes, it should foam and bubble vigorously. No foam = dead yeast. Active dry yeast needs this step; instant yeast doesn't but can still be tested this way.
Does yeast type affect rising time?
Yes. Instant yeast works fastest, active dry is slightly slower and benefits from blooming first, fresh yeast is slowest but adds subtle flavor complexity. For the same amount, instant yeast may cut rising time by 15-25% compared to active dry. Temperature is the bigger factor — every 8°C increase roughly doubles yeast activity rate.
Can I use less yeast and ferment longer?
Absolutely — and many artisan bakers prefer this. Using 25-50% of the called-for yeast and extending fermentation (overnight in the fridge) develops more complex flavors, better gluten structure, and improved digestibility. Our calculator gives a standard 0.5-1% yeast ratio; you can safely halve it for a slow, cold ferment.