Yeast Conversion Calculator
Convert between fresh, instant, and active dry yeast. Includes amount adjustment when substituting one type for another.
What is Yeast Conversion Calculator?
The yeast conversion calculator swaps between fresh (cake), active dry, and instant (rapid-rise) yeast. The conversion ratios are well established by professional bakers.
Formula
Fresh = 2.5 × active dry = 3 × instant. So a 7 g packet of instant yeast = 17.5 g active dry / fresh equivalent ÷ 2.5 = 8.75 g active dry.
Worked example
Recipe calls for 21 g fresh yeast. Active dry: 21 / 2.5 = 8.4 g. Instant: 21 / 3 = 7 g.
How to use this calculator
- Enter the amount and unit you have.
- Pick the type you have.
- The equivalent in all three forms appears.
Frequently asked questions
Do I still need to proof active dry yeast?
Yes — dissolve in warm (105–110°F) water with a pinch of sugar for 5–10 minutes before mixing. Skip this for instant yeast (mix directly with flour).
Can I use one for the other?
Yes, with the conversion. Instant and active dry are essentially interchangeable; instant just skips the proofing step. Fresh yeast is harder to find but works in any recipe.
How long does each type last?
Fresh: 2 weeks refrigerated. Active dry / instant: 1 year unopened, 4 months opened in fridge. Old yeast may not rise well — proof a sample first if you're unsure.
Is one better for bread?
All three work for any bread. Fresh gives slightly more flavor; instant is the easiest to use; active dry is most widely available in U.S. supermarkets.