Baking Substitution & Yeast Conversion Calculator
Swap butter, eggs, flour, sugar, and buttermilk with ratio guidance — or switch to Yeast mode to convert between instant, active dry, fresh, and sourdough starter with proofing and hydration notes.
Last updated: 2026-03-27
Baking substitution & yeast calculator
Enter your values
Swap common baking ingredients with ratio guidance, or convert between yeast types with proofing and hydration notes.
Substitution Result
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Choose Ingredient mode for butter/egg/flour/sugar swaps, or Yeast mode to convert between instant, active dry, fresh, and sourdough starter.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
Butter to oil
1 cup butter swapped for oil
A common pantry substitution when you want to keep the bake moving without dairy fat on hand.
Result: Use about 0.75 cups of oil
Eggs to flax eggs
2 eggs swapped for a vegan option
Useful for quick breads and muffins where egg lift is not the only structure source.
Result: Use 2 flax eggs and prepare them with water before mixing
Instant to active dry yeast
Convert 7g instant yeast to active dry
The most common yeast swap — active dry needs proofing but the ratio is straightforward.
Result: Use 8.75g active dry yeast and proof in warm water for 5-10 minutes
Active dry to sourdough starter
Replace 7g active dry yeast with sourdough
A bigger conversion that changes timing, hydration, and flavor profile. Expect longer fermentation.
Result: Use 112g active sourdough starter and adjust flour/water accordingly
How the substitution estimates work
In Ingredient mode, each substitution uses a practical rule-of-thumb ratio plus a technique note. In Yeast mode, the calculator applies standard conversion factors between instant, active dry, fresh, and sourdough starter.
Yeast conversions include proofing instructions (active dry needs warm water activation, instant mixes directly into flour) and hydration adjustments for sourdough starter, which contributes both flour and water to the dough.
Baking substitution & yeast FAQs
Why the ratios are only part of the answer and how to handle yeast conversions.
Why does the calculator include caveats instead of pretending every swap is perfect?
Because ingredient substitutions change more than quantity. They also change fat, water, protein, browning, and structure, so a short technique note is part of the real answer.
Are flour swaps ever truly 1:1?
Sometimes, but often not. Protein content, absorbency, and grind size all matter, which is why gluten-free and low-protein swaps need extra context instead of a simple number alone.
How do I convert between yeast types?
Use Yeast mode. The key ratios: instant to active dry is 1:1.25, instant to fresh is 1:3, and instant to sourdough starter is roughly 1:20. Active dry yeast needs proofing in warm water; sourdough needs hydration adjustments.
What if I am converting to sourdough starter?
Sourdough starter is roughly 50% flour and 50% water by weight. When replacing commercial yeast with starter, reduce the recipe's flour and water by half the starter weight each. Expect 2-4x longer rise times.
How much yeast is in a standard packet?
A standard US yeast packet contains 7 grams (about 2.25 teaspoons) of yeast. This calculator defaults to 7g as a starting point.
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</script> Related tools
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