Yeast Converter
Convert between fresh, active dry, and instant yeast in any direction.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Different bread recipes call for different yeast types, and they are not interchangeable in equal amounts. This converter handles all the math for you:
- Enter your amount in grams. Weigh your yeast on a kitchen scale for the most accurate results. A standard packet of active dry or instant yeast is 7 grams (2.25 tsp). Fresh yeast typically comes in 17g or 42g blocks.
- Select the yeast type you have. Choose Active Dry, Instant (Rapid-Rise), or Fresh (Cake Yeast) from the dropdown.
- Read the equivalents. The breakdown shows all three yeast types so you can use whatever type your recipe calls for.
Results update instantly. Use the Copy button to copy all three values, or Share to send a link to this conversion.
About Yeast Conversion Ratios
The three common yeast types have different activity levels and water content, which is why they cannot be swapped 1:1. Fresh (cake) yeast is the baseline, containing the most water weight. Active dry yeast is dehydrated fresh yeast and is about 40% as potent by weight, meaning you need 2.5 times less fresh yeast than active dry by weight. Instant yeast is even more concentrated and processed so it does not need proofing, requiring only one-third the weight of fresh yeast.
Standard conversions: Fresh to Active Dry, divide by 2.5. Fresh to Instant, divide by 3. Active Dry to Instant, multiply by 0.75. These ratios align with King Arthur Baking and Red Star Yeast guidelines.
Frequently Asked Questions
What is the difference between active dry and instant yeast?
Both are dried forms of yeast, but instant yeast (also called rapid-rise or bread machine yeast) has smaller granules and can be added directly to dry ingredients without proofing in warm water first. Active dry yeast has larger granules and traditionally needs to be dissolved in warm water (around 105-115°F) for 5-10 minutes before use to activate it. In practice, modern active dry yeast can usually be used without proofing, but instant yeast will work faster. Instant yeast is also more potent, so you need about 25% less of it than active dry.
How much yeast is in one packet?
One standard packet of active dry or instant yeast in the United States contains 7 grams (0.25 oz), which equals approximately 2.25 teaspoons. This amount is enough to leaven about 3-4 cups of flour, or one standard loaf of bread. Fresh yeast typically comes in 17g (0.6 oz) or 42g (1.5 oz) blocks in the US.
Can I use active dry yeast instead of instant yeast?
Yes, with two adjustments. First, use 25% more active dry yeast than the instant yeast called for (or use this converter). Second, proof the active dry yeast in warm water first if you want to be sure it is alive. Your dough may also take a little longer to rise. For most bread recipes the substitution works seamlessly, though the rise time may be 15-30 minutes longer.
How do I know if my yeast is still active?
Proof your yeast by dissolving it in warm water (105-115°F) with a pinch of sugar. After 5-10 minutes, the mixture should be foamy and smell yeasty. If it does not foam, the yeast is dead and your bread will not rise. This can happen if the yeast is past its expiration date, was stored improperly (heat kills yeast), or the water was too hot (above 120°F kills active yeast) or too cold (below 70°F is too slow to activate quickly).