Yeast Conversion Calculator – Fresh, Active and Instant in 3 Easy Steps
Yeast Conversion Calculator
Use this yeast conversion calculator to accurately convert between Fresh (Compressed), Active Dry, and Instant Yeast for your baking recipes.
Use this free yeast conversion calculator to swap between fresh (compressed) yeast, active dry yeast and instant yeast in any recipe. Type the amount you have in any box and the other two update instantly, with the conversion formula shown underneath.
Quick answer
The standard baker’s ratio is 1 g instant yeast = 1.2 g active dry yeast = 3 g fresh yeast. To convert fresh yeast, divide by 3 for instant or by 2.5 for active dry. So 30 g fresh yeast equals 10 g instant or 12 g active dry, and one 7 g sachet of instant yeast equals about 21 g fresh yeast.
Table of Contents
Bread recipes from bakeries and older cookbooks often call for fresh yeast, while most home kitchens keep dried yeast in the cupboard. Using the same weight of a different yeast can leave dough flat or make it over-proof and taste yeasty.
This yeast conversion calculator uses the standard baker’s ratios, so you can follow any recipe with the yeast you already have.
Yeast Conversion Formulas
- Fresh → Instant: fresh ÷ 3
- Fresh → Active dry: fresh ÷ 2.5
- Instant → Fresh: instant × 3
- Active dry → Fresh: active dry × 2.5
- Instant → Active dry: instant × 1.2
- Active dry → Instant: active dry ÷ 1.2
Yeast Conversion Chart
| Fresh yeast | Active dry yeast | Instant yeast |
|---|---|---|
| 10 g | 4 g | 3.3 g |
| 15 g | 6 g | 5 g |
| 21 g | 8.4 g | 7 g (1 sachet) |
| 25 g | 10 g | 8.3 g |
| 30 g | 12 g | 10 g |
| 42 g (1 cube) | 16.8 g | 14 g |
| 50 g | 20 g | 16.7 g |
How to Use the Yeast Conversion Calculator
Step 1: Enter the Fresh Yeast From Your Recipe
Type the fresh yeast amount in Fresh Yeast. For 30 g, the calculator shows 12 g active dry and 10 g instant. The formula panel shows Active Dry = 30 ÷ 2.5 = 12 and Instant = 30 ÷ 3 = 10.
Step 2: Convert a Dry Yeast Sachet
You can start from any box. Enter 7 in Instant Dry, the weight of a standard sachet, and the calculator returns 21 g fresh and 8.4 g active dry. Use the copy buttons to paste a value into your notes.
Step 3: Check the Common Conversions
The Common Yeast Conversions panel keeps the key numbers in view: one sachet is 7 g instant, 8.4 g active or 21 g fresh, and the base ratio is 1 g instant = 1.2 g active = 3 g fresh. Press Clear Fields for a new recipe.
Fresh vs Active Dry vs Instant Yeast
| Type | How to use | Shelf life |
|---|---|---|
| Fresh (compressed) | Crumble into the flour or dissolve in liquid | About 2 weeks in the fridge |
| Active dry | Bloom in warm water (about 38–43°C) for 5–10 minutes first | About 1 year sealed, 4 months open in the fridge |
| Instant (rapid rise) | Mix straight into the flour | About 1 year sealed, 4–6 months open in the fridge |
Baking Tips When Swapping Yeast
- Weigh yeast on a scale that reads 0.1 g for small amounts.
- For long, cold fermentation, you can use a little less yeast than calculated.
- Salt and sugar slow yeast, so keep them apart when adding to the bowl.
- If your dried yeast is old, test it in warm water with a pinch of sugar. It should foam within 10 minutes.
Teaspoons and Grams
One level teaspoon of instant or active dry yeast weighs about 3 g, and a standard 7 g sachet is about 2¼ teaspoons. Weighing is more accurate, especially for small batches.
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Frequently Asked Questions
How do I convert fresh yeast to instant yeast?
Divide the fresh yeast weight by 3. 30 g fresh yeast equals 10 g instant yeast.
How do I convert fresh yeast to active dry yeast?
Divide by 2.5. 30 g fresh yeast equals 12 g active dry yeast.
How much fresh yeast is one sachet of dry yeast?
A 7 g sachet of instant yeast equals about 21 g of fresh yeast.
Can I use instant yeast instead of active dry?
Yes. Use about 20% less instant yeast and mix it straight into the flour, no blooming needed.
How many grams is a teaspoon of dry yeast?
About 3 g for instant or active dry yeast.
Is my data saved?
No. The yeast conversion calculator runs in your browser and nothing is stored.