There are about 3 grams of yeast in a teaspoon, and one standard packet holds about 7 g, which is 2 1/4 teaspoons. Those numbers come from King Arthur Baking's chart for instant yeast, which lists 2 tsp at 6 g, 2 1/4 tsp at 7 g and 1 tbsp at 9 g.
| Amount | Grams |
|---|---|
| 1/4 tsp | 0.8 g |
| 1/2 tsp | 1.5 g |
| 1 tsp | 3 g |
| 2 tsp | 6 g |
| 2 1/4 tsp (1 packet) | 7 g |
| 1 tbsp | 9 g |
If you do the math, 2 1/4 teaspoons at 3 g each is 6.75 g, which King Arthur rounds to 7 g. Red Star says one packet of dry yeast is 0.25 oz, and a quarter ounce is about 7.1 g, so the numbers line up.
Why a teaspoon of yeast isn't always 3 grams
Yeast is used in tiny amounts, so even small measuring slips are a big share of the total. A few things shift the weight of a spoonful:
- Instant vs active dry. King Arthur's figures are for instant yeast. Active dry granules can be a slightly different size, so a spoonful may not weigh exactly the same. Packets of both types hold the same 1/4 oz, though.
- Level vs heaped. A rounded teaspoon of yeast can carry noticeably more than 3 g. In a loaf that only needs one or two teaspoons, that's a real difference.
- Packing. Pressing the spoon into a jar or bag compacts the granules.
- Spoon size. Measuring spoon sets vary a little, and that matters most at the 1/4 and 1/2 teaspoon sizes.
Too much yeast can make dough rise fast and taste yeasty. Too little and you're waiting around for a rise that doesn't come. Weighing takes the guesswork out of both.
How to weigh grams of yeast in a teaspoon
A regular kitchen scale that reads in whole grams has a hard time with yeast, because 3 g and 4 g look a lot alike on a big platform. Here's what helps:
- Use a scale that reads in 0.1 g steps if you can.
- Put a small cup or the spoon itself on the scale and press tare.
- Add yeast until you reach your number, like 3 g for 1 tsp or 7 g for a packet's worth.
- Add it to your flour, and keep the yeast and salt from sitting together in a big clump before mixing.
For more on handling tiny amounts like this, see our guide on how to measure small ingredients without guessing.
Switching from packets to a jar of yeast
Buying yeast in a jar or a larger bag is common once you bake regularly. The catch is that many recipes still say "1 packet." Here's how to translate:
- 1 packet = about 7 g = 2 1/4 tsp.
- 2 packets = about 14 g = 4 1/2 tsp.
- 1/2 packet = about 3.5 g, a little over 1 tsp.
That last one is where weighing really pays off. Splitting a packet in half by eye is tough, but weighing 3.5 g is easy. It's handy when you halve a recipe or make a small batch of rolls.
Going the other way works too. If a bread recipe gives yeast in grams and you only have packets, one packet covers anything up to about 7 g. Weigh out what you need and fold the rest of the packet closed for next time.
Common yeast measuring mistakes
- Using a heaped spoon. Level it off with a straight edge, or weigh it.
- Treating "1 tablespoon" and "1 packet" as the same. A tablespoon is about 9 g, while a packet is about 7 g.
- Rounding a half teaspoon. At 1.5 g, a small slip is a big percentage. A scale with 0.1 g steps catches it.
- Mixing up yeast types in a recipe. If a recipe was written for active dry and you have instant, follow the maker's directions for switching, since they can be handled differently in the dough.
A practical tip: a MeasureMate digital measuring spoon scoops and weighs in one step, and its display reads in 0.1 g steps, so you can see 3.0 g for a teaspoon of yeast right in the spoon. The removable spoon head is easy to wipe out between ingredients.
Quick questions
How many grams are in a packet of yeast?
About 7 g. Red Star lists a packet as 0.25 oz, and King Arthur Baking puts 2 1/4 tsp of instant yeast at 7 g.
How many teaspoons are in a packet of yeast?
About 2 1/4 teaspoons.
How many grams of yeast are in a tablespoon?
About 9 g of instant yeast, according to King Arthur Baking.
Weights based on the King Arthur Baking ingredient weight chart, Red Star Yeast and NIST unit conversions.