Yeast Conversion Calculator (Active Dry, Instant, Fresh)
Convert between active dry, instant (rapid-rise), and fresh (cake) yeast by weight using standard baking ratios. Runs in your browser.
One standard packet of active dry ≈ 7 g (2¼ tsp).
By weight, instant : active dry : fresh yeast ≈ 1 : 1.25 : 3 (King Arthur Baking). So instant is the most potent — use about 25% less instant than active dry, and roughly 3× the weight in fresh yeast. Active dry traditionally needs proofing in warm water first; instant can go straight into the flour. Adjust rise times by feel — proofing is temperature-dependent. Educational; everything runs in your browser.
About this tool
Bread recipes call for one of three forms of yeast — active dry, instant (also sold as rapid-rise or bread-machine yeast), and fresh (cake) yeast — and they are not interchangeable spoon-for-spoon because they contain different concentrations of live cells and moisture. This calculator converts an amount of one form into the equivalent amount of another so your dough gets the right leavening power. The conversions use the standard baking ratio, by weight, of instant : active dry : fresh ≈ 1 : 1.25 : 3 (consistent with King Arthur Baking's guidance). The practical upshot: instant yeast is the most concentrated, so you use roughly 25% less of it than active dry; fresh yeast is mostly moisture, so you need about three times the weight of the equivalent instant amount. Converting by weight is the most reliable approach, which is why the tool works in grams — a standard packet of active dry yeast is about 7 grams, or 2¼ teaspoons. Beyond the quantity, the forms differ in handling, which the tool notes: active dry yeast was traditionally dissolved and 'proofed' in warm liquid before mixing (modern active dry can often be mixed in directly, but proofing still verifies it is alive), while instant yeast is milled finer and can be added straight to the dry ingredients and tends to rise a bit faster. Fresh yeast, favored by some professional bakers for flavor, is perishable and must be crumbled in. Because yeast activity depends heavily on dough temperature and time, treat converted amounts as the starting point and judge the rise by how the dough looks and feels rather than the clock. Educational; everything runs in your browser; nothing is uploaded.
How to use it
- Enter the amount in grams (a packet of active dry is about 7 g).
- Select the yeast type your recipe specifies or that you have.
- Select the type you want to convert to.
- Read the equivalent weight, and adjust rise time by observing the dough.
Frequently asked questions
- How do I substitute instant yeast for active dry?
- Use about 25% less instant yeast by weight: instant = active dry × 0.8 (because instant is more concentrated). Instant can be mixed straight into the dry ingredients without proofing.
- How much fresh yeast equals a packet of dry yeast?
- About 3× the weight in fresh (cake) yeast compared to instant, or roughly 2.4× the weight of active dry. A 7 g packet of active dry is therefore about 17 g of fresh yeast.
- What is the ratio between the three yeast types?
- By weight, instant : active dry : fresh ≈ 1 : 1.25 : 3. Instant is the most potent per gram, active dry is in the middle, and fresh yeast is mostly water so you need much more.
- Do I need to proof active dry yeast?
- Traditionally yes — dissolve it in warm liquid first. Most modern active dry can be added directly, but proofing confirms the yeast is alive. Instant yeast does not need proofing and goes in with the dry ingredients.
- Will converting yeast change my rise time?
- It can. Instant yeast tends to rise faster than active dry, and rise speed depends strongly on dough temperature. Use converted amounts as a starting point and judge doneness by the dough doubling, not a fixed time.
- Is anything uploaded?
- No. All calculations run entirely in your browser.