Yeast Converter
Enter the fresh (cake) yeast a recipe calls for and get the equivalent active dry yeast and instant yeast — so you can bake with whatever you have on hand.
Both dry forms at once
Enter the fresh yeast in grams and the calculator returns the active dry yeast (fresh ÷ 3) and the instant yeast (fresh ÷ 4) together.
Ratios, not lab values
These are practical kitchen ratios. Brands vary, so treat the result as a reliable starting point rather than a chemically exact figure.
What does the yeast converter do?
From fresh to dry
This yeast converter turns the fresh (cake) yeast a recipe lists into the amount of active dry yeast and instant yeast you would use instead. Fresh yeast is mostly water, so dried forms are far more concentrated and you always need less of them. The two ratios bakers rely on are simple: active dry yeast is about one third of the fresh weight, and instant (rapid-rise) yeast is about one quarter. Enter the grams of fresh yeast and you get both equivalents straight away, which is exactly what you need when a recipe assumes one form but your pantry holds another.
Enter the fresh yeast in grams to get the active dry yeast and the instant yeast equivalents instantly.
Active dry yeast is the fresh-yeast weight divided by three, and instant yeast is the fresh weight divided by four.
active dry = fresh ÷ 3, instant = fresh ÷ 4Because fresh yeast carries so much moisture, the dried forms replace it at a fraction of the weight. Active dry yeast keeps the well-known three-to-one ratio, while instant yeast — milder and more concentrated still — comes in at four-to-one. Both outputs are returned in grams alongside the fresh amount you entered.
Suppose a recipe calls for 30 g of fresh (cake) yeast.
Divide by three for active dry
30 ÷ 3 = 10 — so you need 10 g of active dry yeast.
Divide by four for instant
30 ÷ 4 = 7.5 — so you need 7.5 g of instant yeast.
Pick what you have
Use either 10 g active dry or 7.5 g instant in place of the 30 g of fresh yeast the recipe lists.
The two outputs tell you how much dried yeast replaces the fresh yeast in your recipe. The ratios are easy to remember: fresh to active dry is roughly 3:1, and fresh to instant is roughly 4:1. That is why 30 g of fresh yeast becomes only 10 g of active dry or 7.5 g of instant — the dried forms are far more concentrated because fresh yeast is largely water. Instant yeast is the most concentrated of the three and can usually be stirred straight into the dry ingredients, while active dry yeast traditionally benefits from being proofed in a little warm liquid first. Whichever you choose, the rise will be comparable to the original recipe; you are simply matching the live-yeast content, not changing the bake.
The conversion is a dependable rule of thumb, but a few practical points are worth keeping in mind.
Approximate ratios that vary by brand
The 3:1 and 4:1 ratios are standard approximations — exact strength differs between brands and batches, so use the result as a starting point and adjust to your dough if needed. Active dry yeast should usually be proofed in warm liquid before mixing to confirm it is alive, while instant yeast can go in dry. These figures assume baking yeast, not brewing or wild-yeast cultures.