Yeast Substitution & Proofing Adjustment Calculator
Recipes often call for a specific yeast type. Enter the amount and type you have (or need), and get an accurate conversion plus an adjusted proofing time estimate.
Converted Yeast Amount
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Active Dry Equivalent (g)—
Converted Amount (g)—
Estimated Proof Time (min)—
About this calculator
Convert between active dry, instant, and fresh yeast quantities and get an adjusted proofing time estimate for your recipe.
Frequently Asked Questions
What's the conversion ratio between yeast types?
A common rule: 1 part active dry yeast = 1.25 parts instant yeast (instant is more potent, so use slightly less) = 3 parts fresh yeast by weight.
Does temperature really change proofing time that much?
Yes, yeast activity roughly doubles for every 10°F increase within its optimal range, so warmer rooms proof significantly faster than cool ones.
Can I substitute fresh yeast directly for instant?
Not directly by weight — fresh yeast contains more moisture and less concentrated yeast cells, so you need about 3 times as much fresh yeast as instant yeast.