Yeast Conversion Calculator
Convert between instant yeast, active dry yeast and fresh yeast by weight, with teaspoon and packet equivalents.
What you need
6g
Instant yeast
- Active dry yeast
- 7 g
- Fresh yeast
- 17 g
- Instant yeast in teaspoons
- 1.81 tsp
- Active dry in teaspoons
- 2.26 tsp
- Packets of instant or active dry
- 0.8
A US packet is 7 g of either. Fresh yeast is not sold in packets.
Guide figures. Ingredient weights, pan sizes and cooking times all vary — see the assumptions below for the ones used.
Shop this project
Buying yeast by the pound and freezing it costs a fraction of the same weight in packets. Quantities come straight from your calculation above — check them against your supplier's pack sizes before ordering.
Your shopping list
- Instant yeast
- 6 g
Materials
Instant yeast
Keeps for years in the freezer, which is cheaper than buying packets.
Tools & equipment
Digital kitchen scale
Weighing removes the cup-packing variable entirely, which is the single biggest accuracy win in baking.
Measuring spoons
For the awkward amounts a scaled recipe lands on.
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How to use the yeast conversion calculator
The three kinds of yeast are not interchangeable gram for gram. Instant is the most concentrated, active dry needs about a quarter more, and fresh yeast needs roughly three times as much because most of its weight is water. Enter what a recipe calls for and see the equivalent in the others.
Why the three are not interchangeable
All three contain the same organism; what differs is how much of the weight is live yeast. Fresh yeast is about 70% water, so most of what you weigh is not doing anything. Drying removes that water and concentrates the cells, which is why dry yeast is needed in far smaller amounts.
Instant and active dry differ more subtly. Instant is dried faster into finer particles that rehydrate almost immediately. Active dry is dried more slowly and has a shell of dead cells around each granule, which adds weight and slows hydration — hence the 25% uplift.
Using less yeast on purpose
Most bread recipes call for more yeast than the bread needs, because they are optimised for speed. Halving the yeast and letting the dough take twice as long produces noticeably better flavour, since the slower fermentation gives the flour's own enzymes time to work.
This is the same principle behind overnight pizza dough and cold-proofed sourdough. If you have time rather than yeast, time is the better ingredient — and the conversion above still applies, just at a smaller starting number.
What this calculator assumes
Every estimate depends on figures that vary by supplier and conditions. These are the ones used here, so you can sanity-check the result against your own quote.
- Conversions use the standard ratios by weight: 1 part instant yeast equals 1.25 parts active dry equals 3 parts fresh. Fresh yeast is about 70% water, which is why so much more of it is needed.
- Granular yeast is taken as 3.1 g per level teaspoon and a US packet as 7 g, which is 2 1/4 teaspoons. Teaspoon figures apply only to instant and active dry — fresh yeast is a paste and cannot be measured by spoon.
- Modern active dry yeast does not need proofing in warm water first. That instruction survives from older, coarser products; today's active dry can be mixed straight into flour, though it hydrates a little more slowly than instant.
- Instant yeast goes into the dry ingredients directly. Do not let either dry yeast sit in direct contact with salt before mixing, which draws water out of the cells.
- Rise times are not part of the conversion. Instant yeast starts faster than active dry at the same effective strength, so a converted dough may be ready 15 to 20 minutes sooner or later than the recipe says. Judge by the dough.
- Fresh yeast is perishable — around two weeks refrigerated — while dry yeast keeps for months sealed, and years in the freezer.
Frequently asked questions
How much instant yeast replaces active dry?
About 25% less. Where a recipe calls for 10 g of active dry, use 8 g of instant. Going the other way, multiply instant by 1.25. The difference exists because active dry has a layer of dormant cells around each granule that contributes weight but no activity.
How many teaspoons are in a packet of yeast?
Two and a quarter teaspoons, which is 7 g. That is the standard US packet size for both instant and active dry, and it is what a recipe means when it says one envelope or one sachet.
Can I substitute fresh yeast for dry?
Yes, at roughly three times the weight — 21 g of fresh for 7 g of instant. Crumble it into the liquid rather than the flour. Fresh yeast gives a flavour many bakers prefer, but it lasts only a couple of weeks and is hard to find outside a bakery or a good deli counter.
Is rapid rise yeast the same as instant yeast?
Essentially yes. Rapid rise, quick rise, bread machine yeast and instant yeast are the same product under different marketing names, sometimes with added dough conditioners. Treat them as interchangeable with instant at the same weight.
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