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Yeast Conversion Calculator

Convert between active dry, instant, fresh, and sourdough yeast.

Last updated: June 13, 2026

Calculator

Amount

tsp

Convert From

Results

Active Dry Yeast2.25 tsp (7.0g)

Instant Yeast1.80 tsp (5.6g)

Fresh Cake Yeast17.4g

Sourdough Starter335g (fed, active)

How to Use This Calculator

1Enter the amount in teaspoons.
2Select the yeast type you are converting from.
3View equivalent amounts for all four yeast types.

Formula Explanation

Different yeast types have different concentrations of active yeast cells, requiring specific conversion ratios.

Active Dry : Instant = 1 : 0.8 Active Dry : Fresh = 1 : 2.5 Active Dry : Sourdough Starter = 1 : 48 (by weight)

Variables:

Active DryStandard dried yeast requiring proofing

InstantFast-acting yeast, no proofing needed

FreshCake yeast, perishable, measured by weight

Worked Examples

Convert 2.25 tsp Active Dry to Instant

1. 2.25 tsp Active Dry × 0.8 = 1.80 tsp Instant

Result: 1.80 tsp instant yeast

Why Use This Calculator

Never skip a recipe because you have the wrong yeast type.
Covers all common yeast types including sourdough starter.
Shows precise measurements in both teaspoons and grams.
Essential reference for bread bakers.

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Tips & Best Practices

Instant yeast can be mixed directly into flour; active dry should be proofed first.
Fresh yeast should be crumbled and dissolved in warm liquid before adding.
Sourdough starter should be fed and active (bubbly) before using as a substitute.

Common Mistakes to Avoid

❌ Using the same amount of instant as active dry.

✅ Instant is more concentrated. Use 20% less than active dry yeast.

❌ Proofing instant yeast like active dry.

✅ Instant yeast does not need proofing. Mix it directly with your dry ingredients.

Frequently Asked Questions

Can I use instant yeast instead of active dry?

Yes! Use about 25% less instant yeast than active dry, and skip the proofing step. Mix it directly into your dry ingredients.

How much sourdough starter replaces yeast?

Roughly 1 cup (about 150g) of active, fed sourdough starter replaces one packet (2.25 tsp) of yeast. You will need to adjust flour and water in your recipe accordingly.

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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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