How do I convert active dry yeast to instant?

Multiply active dry yeast by 0.75 to get instant yeast. If a recipe calls for 8g active dry, use 6g instant.

Can I substitute fresh yeast for instant?

Yes — fresh yeast is about 3x the weight of instant. If a recipe calls for 7g instant, use about 22g fresh yeast.

How much sourdough starter replaces instant yeast?

As a general guide, replace 1 packet (7g) instant yeast with about 227g (8oz) of active sourdough starter, reducing flour and water in the recipe by 113g each.

Does temperature affect how much yeast to use?

Yes — yeast is most active between 75–85°F. Below 65°F fermentation slows significantly; above 95°F yeast can die. Adjust quantity or ferment time for your kitchen temperature.

Yeast Conversion Calculator

Convert between instant, active dry, and fresh yeast by weight. Includes sourdough starter equivalent, packet-to-grams conversion, and temperature impact on fermentation.

Amount ?

From Yeast Type

To Yeast Type

Equivalent Amount

—

Notes —

Extended More scenarios, charts & detailed breakdown ▾

Amount (g)

From

Equivalent Amount

—

Professional Full parameters & maximum detail ▾

Yeast Amount (g)

From Type

To Type

Dough Temperature (°F)

°F

Converted Amount

—

Temperature Impact —

Salt Separation —

Proofing Test —

How to Use This Calculator

Enter the amount of yeast in grams (1 standard packet = 7g instant, 8g active dry).
Select the From yeast type you have.
Select the To type you need.
The calculator shows the equivalent amount using standard conversion ratios.

Formula

Instant → Active Dry: ÷ 0.75
Active Dry → Instant: × 0.75
Instant → Fresh: ÷ 0.32
Fresh → Instant: × 0.32

Example

Recipe calls for 10g active dry yeast: 10 × 0.75 = 7.5g instant yeast. Or 10 ÷ 0.32 = 31.25g fresh yeast.

Frequently Asked Questions

Multiply active dry yeast by 0.75 to get instant yeast. If a recipe calls for 8g active dry, use 6g instant.
Yes — fresh yeast is about 3x the weight of instant. If a recipe calls for 7g instant, use about 22g fresh yeast.
As a general guide, replace 1 packet (7g) instant yeast with about 227g (8oz) of active sourdough starter, reducing flour and water in the recipe by 113g each.
Yes — yeast is most active between 75–85°F. Below 65°F fermentation slows significantly; above 95°F yeast can die. Adjust quantity or ferment time for your kitchen temperature.

Related Calculators

Sources & References (4) ▾

King Arthur Baking – Yeast Conversion — King Arthur Baking
Red Star Yeast Conversion Guide — Red Star Yeast
Bread Baker's Apprentice — Peter Reinhart
America's Test Kitchen – Yeast Guide — America's Test Kitchen