Free Yeast Type Converter calculator
Swap any amount of yeast between fresh, active dry and instant — get the exact grams and teaspoons for the very same rise, updated live, as you type.
On this page14 sections
| Yeast type | Grams | Teaspoons |
|---|---|---|
| Fresh / cake | 16.8 g | 1.79 tsp |
| Active dry | 7 g | 2.25 tsp |
| Instant | 5.6 g | 1.8 tsp |
All three rows leaven the same dough. Fresh weighs about 3× instant and 2.4× active dry, because it is mostly water; instant is the most concentrated. Dry forms use 3.11 g per teaspoon.
Conversions follow standard King Arthur / Red Star ratios; check your yeast brand's label for its own equivalents.
Results are estimates. Consult a professional.
How the yeast type converter works
Fresh, active dry and instant yeast are the same organism in three forms, and the only real difference is how much water each one still holds. Fresh yeast is mostly moisture, active dry is dried to a coarse granule, and instant is dried further and milled fine. So equal leavening power needs different weights of each — and that weight difference is all this converter does.
The calculator treats instant yeast as the baseline, because it is the most concentrated. It turns whatever you enter into an instant-equivalent weight, then scales that to the type you want. Pick your amount, the type your recipe lists, and the type sitting in your cupboard.
Yeast conversion ratios: fresh, active dry and instant
Three numbers carry the whole conversion. By weight, instant is the reference, active dry weighs about a quarter more, and fresh weighs three times as much because of its water content.
- Instant → active dry — multiply by 1.25. Active dry is slightly less potent by weight, so you need a little more.
- Instant → fresh — multiply by 3. Fresh yeast is roughly two-thirds water, so it takes three times the weight.
- Active dry → instant — multiply by 0.8 (divide by 1.25). Instant is the more concentrated of the two dry forms.
- Fresh → active dry — multiply by about 0.4 (divide by ~2.4). One-third of a 2 oz fresh cake replaces one ¼ oz packet of dry yeast.
A worked example: converting a packet of yeast
Mia's bread recipe lists 7 g of active dry yeast — one standard packet — but her jar holds instant. She also wants to know the fresh-yeast figure in case the bakery only has cake yeast.
Step 1 — Find the instant-equivalent weight
Divide the active dry weight by its factor: 7 ÷ 1.25 = 5.6 g instant-equivalent. That is the leavening power of the packet, expressed as instant yeast.
Step 2 — Read off the instant amount
Instant's factor is 1.00, so the instant weight is the equivalent itself: 5.6 g instant, about 1.8 teaspoons. Mia uses 5.6 g of instant and mixes it straight into the flour.
Step 3 — Convert the same dough to fresh yeast
Multiply the 5.6 g instant-equivalent by fresh's factor of 3: 5.6 × 3 = 16.8 g fresh yeast. That is the crumbled cake-yeast amount for the very same loaf.
Yeast conversion chart
If you would rather scan a table than run the numbers, this chart converts common amounts across all three types. Figures are by weight in grams, with the packet row as the everyday anchor.
| Instant | Active dry | Fresh (cake) |
|---|---|---|
| 1 g | 1.25 g | 3 g |
| 2 g | 2.5 g | 6 g |
| 4 g | 5 g | 12 g |
| 5.6 g | 7 g (1 packet) | 16.8 g |
| 7 g | 8.75 g | 21 g |
| 10 g | 12.5 g | 30 g |
All three columns in a row leaven the same dough. One standard ¼ oz packet is 7 g of active dry (2¼ tsp). Ratios follow King Arthur and Red Star.
Fresh vs active dry vs instant yeast
The types behave differently in the bowl, not just on the scale. Knowing how each one wants to be handled is what keeps a substitution from flopping.
Fresh (cake) yeast
Sold as a soft, crumbly block, fresh yeast is about two-thirds water and the most perishable form — a week or two in the fridge, longer in the freezer. Bakers prize it for a slightly fuller flavour, and it crumbles straight into the dough or dissolves in a little warm liquid.
Active dry yeast
These are larger granules with a dormant coating. Traditionally it is dissolved in warm liquid first, which wakes the yeast and proves it is alive. It keeps for months in a sealed jar and is the most common supermarket yeast.
Instant (rapid-rise) yeast
Milled into fine particles, instant yeast — also labelled rapid-rise, quick-rise or bread-machine yeast — needs no soaking and goes dry into the flour. It is the most concentrated, so you use the least by weight, and it shrugs off long fridge storage.
How to substitute yeast types without ruining the rise
Getting the weight right is only half the job. The other half is handling — the step most quick conversion charts skip, and the reason a swapped recipe sometimes fails to rise.
- Swapping in active dry? Dissolve it in some of the recipe's warm liquid (105–110°F / 40–43°C) for 5–10 minutes first, then subtract that liquid from the dough so the hydration stays the same.
- Swapping in instant or fresh? Skip the soak — both can go straight in. If the recipe proofed active dry in water, fold that water back into the dough.
- Watch the timing, not the clock. Instant rises fastest, active dry a touch slower, fresh somewhere between. Judge the dough by size — doubled — rather than by a fixed number of minutes.
- Keep it away from salt and ice. Don't let concentrated salt or ice-cold water sit directly on the yeast; mix them into the flour and liquid first.
Do you need to proof active dry yeast?
Modern active dry yeast is reliable enough that proofing is mostly a freshness test, not a requirement. Still, there are two good reasons to do it.
First, if your jar has been open a while, dissolving a teaspoon in warm water with a pinch of sugar tells you in ten minutes whether it still foams — that is, whether it is alive. Second, older recipes were written for yeast that genuinely needed the soak to rehydrate. Instant yeast never needs proofing; it is built to hydrate in the dough.
Yeast definitions
How accurate is this yeast converter?
The weight math is exact to the ratios it uses. Divide by the source factor, multiply by the target factor, and the gram figures are precise — 7 g of active dry is 5.6 g of instant and 16.8 g of fresh, every time.
The ratios themselves are the industry-standard ones from King Arthur and Red Star, but brands round them slightly differently, so your packet's label may quote a marginally different equivalent — follow it if it does. Teaspoon figures are approximate, because dry yeast settles differently from spoon to spoon; weigh when accuracy matters. For more on measuring by weight, see the cooking converter and the baking conversions chart.
Wikipedia, "Baker's yeast" — background on fresh, active dry and instant forms and their moisture content.Frequently asked questions about the free Yeast Type Converter calculator
About this Yeast Type Converter calculator
This Yeast Type Converter runs entirely in your browser — nothing you enter is sent anywhere. It converts an amount of yeast between fresh (cake), active dry and instant using the standard King Arthur and Red Star ratios, giving you both the gram weight and the teaspoon count for an identical rise.
It is one of our cooking and baking calculators. Browse the full set on the all calculators page.