Yeast Conversion Calculator

About this calculator

Recipes call for yeast in three different forms — active dry (needs proofing in warm water before use), instant (mixed directly into flour, no proofing), and fresh/cake yeast (a moist, perishable block) — and swapping between them isn't a 1:1 substitution because they differ in live-cell density and moisture content. The standard baking conversions treat fresh yeast as roughly three times the weight of instant yeast for the same leavening power, and active dry as needing about 25% more than instant, since a portion of active dry granules die off during rehydration.

This calculator takes an amount of one yeast type and returns the equivalent amount in the other two forms using these standard ratios. Home bakers working from an old recipe written for cake yeast, professional bakers standardizing recipes onto instant yeast for shelf life, and recipe developers converting a formula for publication use it to avoid over- or under-proofing a dough when the yeast on hand doesn't match what the recipe specifies.