Yeast converter

What is a yeast converter?

A yeast converter is a small kitchen tool that tells you how much of one kind of yeast to use in place of another. Recipes are written for a specific type of yeast, but the jar in your cupboard is not always the same. Because the three common baking yeasts — active dry, instant (also called rapid-rise or bread-machine yeast) and fresh (cake or compressed yeast) — differ in how much live cell mass they contain per gram, you cannot simply swap them gram for gram. This converter does that adjustment for you.

Enter the amount your recipe calls for, choose the yeast type you are converting from and the type you are converting to, and the calculator returns the equivalent weight.

How does it work?

Every yeast is expressed relative to instant yeast, which is used as the base (factor = 1). Instant yeast is the most concentrated of the three, so it takes the least of it to leaven a dough. The relative factors are:

A larger factor means you need proportionally more of that yeast to get the same rise. To convert an amount from one type to another, multiply by the ratio of the two factors.

Formula

$\text{converted} = \text{amount} \times \frac{\text{to factor}}{\text{from factor}}$

Where the “from factor” and “to factor” are read from the table above.

Worked examples

Active dry to instant

You have a recipe that calls for 10 g of active dry yeast, but you only have instant yeast.

$10 \text{ g} \times \frac{1}{1.25} = 8 \text{ g}$

So 10 g of active dry yeast is replaced by 8 g of instant yeast.

Active dry to fresh

Converting the same 10 g of active dry yeast to fresh yeast:

$10 \text{ g} \times \frac{3.0}{1.25} = 24 \text{ g}$

You would use 24 g of fresh yeast.

Instant to fresh

Starting from 10 g of instant yeast:

$10 \text{ g} \times \frac{3.0}{1} = 30 \text{ g}$

That is 30 g of fresh yeast.

Quick conversion table

Starting from 10 g of each type:

Notes

• These factors are the widely used baking rules of thumb (instant : active dry : fresh ≈ 1 : 1.25 : 3). Different manufacturers vary slightly, so treat the result as a close starting point rather than a laboratory value.
• Active dry yeast is traditionally proofed in warm water first; modern brands can often be mixed straight into the flour like instant yeast. Fresh yeast is crumbled into the dough and has a short shelf life.
• Swapping yeast types can change how fast the dough rises. Instant yeast is quicker, while fresh yeast tends to be gentler and slower, so keep an eye on the dough rather than the clock. For measuring the finished ingredient by volume, our cups to grams converter can help.

FAQ

How much instant yeast replaces active dry yeast?

Multiply the active dry amount by 1 / 1.25 = 0.8. For example, 10 g of active dry yeast becomes 8 g of instant yeast.

How do I convert dry yeast to fresh yeast?

Fresh yeast has a factor of 3.0. From active dry, multiply by 3.0 / 1.25 = 2.4; from instant, multiply by 3.0. So 10 g of instant yeast equals 30 g of fresh yeast.

Can I convert fresh yeast back to dry?

Yes. To go from fresh to instant, multiply by 1 / 3.0 ≈ 0.333; to go from fresh to active dry, multiply by 1.25 / 3.0 ≈ 0.417. The converter handles both directions automatically.

Does the type of yeast change the rising time?

It can. Instant yeast usually leavens a dough faster than active dry or fresh yeast. The weights here match the leavening power, but you should still judge doneness by how much the dough has risen.