Yeast Conversion Calculator (Fresh to Dry & Instant)

Convert between fresh yeast, active dry yeast, and instant yeast. Includes conversion ratios and a quick reference table for any recipe amount.

Yeast Conversion Quick Reference

Recipe calls for Fresh Yeast Active Dry Instant
1 packet active dry (2¼ tsp) 21g 2¼ tsp 1¾ tsp
1 tsp instant yeast 12g 1¼ tsp 1 tsp
7g fresh yeast 7g ¾ tsp ½ tsp
25g fresh yeast 25g 2⅔ tsp 2 tsp

Which Yeast Should You Use?

Choosing the right yeast depends on your recipe, timeline, and what's available in your pantry. Each type has advantages in different baking scenarios.

Active Dry Yeast

The most widely available yeast in the US, active dry yeast has larger granules and traditionally requires proofing — dissolving in warm water (105–115°F) for 5–10 minutes before adding to your dough. This step lets you verify the yeast is still alive before you commit to a long rise. Modern active dry yeast is often more resilient and can be added directly to dry ingredients, though proofing is still recommended for older packages.

Instant (Rapid Rise) Yeast

Instant yeast is finely milled, making it more surface-area-efficient than active dry. It doesn't require proofing and can be mixed directly into flour. It works faster — typically reducing rise time by 25–50% — making it ideal for busy bakers. Bread Machine Yeast and RapidRise yeast are both forms of instant yeast. Use about 25% less than active dry yeast.

Fresh (Cake) Yeast

Fresh yeast is beloved by professional bakers for its rich flavor and reliable performance. It must be refrigerated and has a short shelf life (2–3 weeks). Fresh yeast is measured in grams rather than teaspoons. It's roughly 3× the weight of active dry yeast for equivalent leavening power. If you can find it at a bakery supply store, it's worth trying for artisan breads and enriched doughs like brioche.

Conversion Ratios Summary

  • Active dry → Instant: multiply by 0.75 (use 25% less)
  • Instant → Active dry: multiply by 1.25
  • Active dry (1 tsp) → Fresh: about 9.33 g fresh yeast
  • Fresh (1g) → Active dry: about 0.11 tsp active dry

Frequently Asked Questions

How do I substitute active dry yeast for instant yeast? +
Use a 1:0.75 ratio: for every 1 teaspoon of active dry yeast, use 3/4 teaspoon of instant (rapid rise) yeast. Instant yeast is more potent per gram because it has smaller granules and doesn't need to be dissolved first. You can also use them 1:1 and get slightly different rise times.
How do I convert fresh yeast to dry yeast? +
Fresh yeast is about 3 times stronger by weight than active dry yeast. The conversion is: 1 teaspoon active dry yeast = 3 teaspoons (1 tablespoon) fresh yeast, or equivalently, divide the fresh yeast amount by 3 to get the active dry equivalent. Fresh yeast is measured in grams — 7g of fresh yeast equals approximately 2.25 teaspoons of active dry.
Can I substitute instant yeast for active dry yeast without proofing? +
Yes — instant yeast can be mixed directly into dry ingredients without proofing (dissolving in warm water first). Active dry yeast benefits from proofing (5 minutes in warm water at 105–115°F) to ensure it's still active, though modern active dry yeast often works fine without it. Instant yeast is generally more reliable and faster.