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Instant, active dry and fresh yeast

Instant yeast mixes straight into the flour; active dry yeast is traditionally dissolved in warm water first; fresh (cake) yeast is moist and perishable. Red Star, which makes all three, swaps instant and active dry one for one (active dry can take a little longer to rise), and puts one 7 g packet of dry yeast level with 0.6 oz (about 17 g) of fresh cake yeast.

Instant ↔ active dry: one for one, says Red Star. Dry → fresh: a 7 g packet equals about 17 g (0.6 oz) of fresh yeast. Yeast → sourdough: not a direct swap; a different recipe and timing.

The three types

Keep yeast cold and airtight once opened. Rise times follow dough temperature, as for sourdough: see the bulk fermentation chart for the yeasted curve.

Baker's yeast compared
TypeHow to useKeeps
Instant (rapid-rise, bread machine)Mix into the flourOpened: months in the fridge or freezer
Active dryTraditionally dissolved in warm water; many modern brands can go straight inOpened: months in the fridge or freezer
Fresh (cake, compressed)Crumble into the flour or waterAbout 1 to 2 weeks in the fridge

Converting

By Red Star's chart, 7 g (one packet) of instant or active dry yeast equals 0.6 oz, about 17 g, of fresh cake yeast: a third of its 2 oz cake. Instant and active dry swap one for one. Measure small amounts on a 0.1 g scale, or convert spoons with the cups to grams converter.

Yeast and sourdough together

A little instant yeast in a sourdough speeds it up: King Arthur adds 1/4 to 1/2 teaspoon per cup of flour, and notes that less yeast leaves more time for flavour. Replacing starter with yeast changes the recipe: the starter's flour and water need adding back, and timings shorten a lot. See preferments.

Questions bakers ask

Can I use instant yeast instead of active dry?

Yes, one for one by weight, says Red Star; mix instant straight into the flour. Dough made with active dry may take a little longer to rise.

How much fresh yeast equals a packet of instant?

About 17 g (0.6 oz) of fresh cake yeast for a 7 g packet, by Red Star's conversion chart.

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