Yeast conversions: instant, active dry, fresh

Instant and active dry yeast swap 1 to 1. Fresh yeast is 2.5 times the weight of active dry and 3 times the weight of instant. Enter an amount.

Free, no sign-up · Updated November 4, 2026

Recipe calls for

Use instead

Active dry

g

teaspoons

Instant

g

teaspoons

Fresh (cake)

g

ounces

At a glance

King Arthur factors, by weight
FreshActive dryInstant
20 g8 g6.6 g
17.5 g7 g (one packet, 2¼ tsp)5.8 g
10 g4 g3.3 g

Active dry and instant swap 1 to 1. The fresh factors for each differ slightly, as King Arthur lists them, so the calculator uses the direct factor for each pair.

Active dry yeast is a little slower to start. King Arthur suggests adding 15 to 20 minutes to a one hour rise. Fresh yeast is sold as a cake; Red Star's 0.6 oz cube replaces one packet of dry yeast.

How it is calculated

  • Instant ↔ active dry: × 1.
  • Active dry → fresh: × 2.5. Instant → fresh: × 3.
  • Fresh → active dry: × 0.4. Fresh → instant: × 0.33.
  • Bread machine, instant in place of active dry: × 0.75.
  • One packet of dry yeast is 7 g, about 2¼ teaspoons.

Worked example

A recipe with 7 g (one packet, 2¼ tsp) of active dry yeast: use 7 g of instant, or 17.5 g of fresh.

Sources

Numbers checked November 4, 2026.

Questions

Can I use instant yeast instead of active dry?

Yes, in the same amount. Active dry starts a little slower: King Arthur suggests adding 15 to 20 minutes to a one hour rise.

How much fresh yeast equals a packet of dry?

About 17 g, which is a 0.6 oz cube. This calculator gives 17.5 g for a 7 g packet.

Do I need to proof the yeast first?

Not for most recipes. King Arthur says to add it with the other ingredients, no proofing needed. Follow your recipe if it says otherwise.

Why is there a different number for a bread machine?

In a bread machine, using instant 1 to 1 for active dry can make the loaf rise too much and collapse. King Arthur says to use 25% less instant yeast.

How many teaspoons is a packet?

About 2¼ teaspoons, or 7 grams. Older packets held a tablespoon.

Does sugar change how much yeast I need?

A lot of sugar slows yeast. Red Star says to add an extra packet of dry yeast if a recipe has more than ½ cup sugar to 4 cups flour.