Yeast Converter
Convert baking yeast between instant, active dry, and fresh by weight.
≈ 2.917 tsp — active dry is best proofed in warm liquid first.
Measured by weight; crumble into the dough or dissolve in warm liquid.
Ratios are widely-cited averages; brands and recipes vary, so treat these as a starting point. Active dry yeast traditionally needs proofing in warm liquid, while instant yeast can be mixed straight into the flour.
To swap yeast forms, keep the weight ratio instant : active dry : fresh ≈ 1 : 1.25 : 3.125. So 10 g of instant yeast equals about 12.5 g of active dry yeast or 31.25 g of fresh (cake) yeast. Convert your amount to grams first, then scale to the form your recipe needs.
The three yeast forms
Instant yeast (also sold as rapid-rise or bread-machine yeast) is finely granulated and dried so hard that it can be mixed straight into the flour. Active dry yeast has larger, coarser granules and is traditionally proofed — dissolved in warm liquid to wake it up — before it joins the dough. Fresh yeast (also called cake or compressed yeast) is a moist, crumbly block with a short shelf life; because most of its weight is water, you need far more of it by weight than either dried form.
Active dry = instant × 1.25 · fresh = active dry × 2.5 = instant × 3.125
Worked example: 10 g of instant yeast
Take the amount in grams, then multiply by each target form’s factor.
- 1 Weigh your yeast in grams. Weight is the reliable common ground; teaspoons of dry yeast are only roughly 3 g each and vary by brand.
- 2 Identify the form you have. Instant, active dry, or fresh. Set instant as the baseline factor of 1.
- 3 Scale to the target form. Active dry = instant × 1.25, fresh = instant × 3.125. For 10 g instant: 10 × 1.25 = 12.5 g active dry and 10 × 3.125 = 31.25 g fresh.
- 4 Adjust the method, not just the amount. If you switched to active dry, proof it in warm liquid first; if you switched to instant, mix it straight into the flour.
Yeast equivalence table
Widely-cited averages by weight; brands and recipes vary. tsp values for dry yeast are approximate (≈ 3 g each).
| Instant | Active dry | Fresh | Note |
|---|---|---|---|
| 3.5 g (≈ 1 tsp) | 4.4 g (≈ 1¼ tsp) | 11 g | Small loaf |
| 7 g (1 packet) | 8.75 g | 22 g | Standard packet |
| 10 g | 12.5 g | 31.25 g | Verify: matches the tool |
| 14 g (2 packets) | 17.5 g | 44 g | Large or enriched dough |
| 21 g | 26.25 g | 66 g | Big batch |
Substitution pitfalls
The ratios convert quantity, but the two dried forms still behave differently, so treat any swap as a starting point and watch the dough rather than the clock. Instant yeast usually rises a little faster; active dry may lag if your liquid is not warm enough to rehydrate it. Fresh yeast is the trickiest to substitute because its water content — and therefore its strength — drifts as it ages, and a tired block can under-perform even at the “correct” weight. When a recipe already specifies a form, converting to match it is safer than forcing a substitution.