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Yeast Conversion: Active Dry vs. Instant vs. Fresh

A guide to converting between different types of yeast: Active Dry Yeast, Instant Yeast (also known as Rapid-Rise or Bread Machine Yeast), and Fresh Yeast (also called Cake Yeast or Compressed Yeast).

If a recipe calls for: Substitute with Active Dry Yeast: Substitute with Instant Yeast: Substitute with Fresh Yeast:
1 packet (1/4 oz or 7g) Active Dry Yeast
(approx. 2 1/4 tsp)
1 packet (7g or 2 1/4 tsp) 1 packet (7g or 2 1/4 tsp) - some say use 25% less (1 3/4 tsp or ~5g) 0.6 oz cake (approx. 17g)
1 tsp Active Dry Yeast 1 tsp 1 tsp (some say use 3/4 tsp) ~0.25-0.3 oz cake (~7-8.5g)
 
1 packet (1/4 oz or 7g) Instant Yeast
(approx. 2 1/4 tsp)
1 packet (7g or 2 1/4 tsp) - may need proofing 1 packet (7g or 2 1/4 tsp) 0.6 oz cake (approx. 17g)
1 tsp Instant Yeast 1 tsp (may need proofing) 1 tsp ~0.25-0.3 oz cake (~7-8.5g)
 
1 oz Fresh Yeast (approx. 28g) ~0.4 oz or ~11-12g (approx. 1 1/2 - 1 3/4 packets or ~3.5-4 tsp) ~0.33-0.4 oz or ~9-11g (approx. 1 1/4 - 1 1/2 packets or ~3-3.5 tsp) 1 oz cake (28g)
0.6 oz Fresh Yeast (approx. 17g cake) ~0.24 oz or ~7g (1 packet or 2 1/4 tsp) ~0.2 oz or ~5-6g (approx. 3/4 packet or ~1 3/4 tsp) 0.6 oz cake (17g)

Key Differences & Usage Notes: