Leaveners, Salt & Spices
Convert cups of instant yeast to grams
One cup of instant yeast weighs about 149 g, and half a cup comes to roughly 74.5 g. Enter any amount below to convert it, or use the chart further down as a quick reference while you cook.
1 cup of instant yeast =
149 g
- oz
- 5.26
- kg
- 0.149
- lb
- 0.328
Instant Yeast: 149 g per US cup · NIST Handbook 133. Also sold as rapid-rise or bread machine yeast. Use about 25% less than active dry by weight for the same rise time.
Full instant yeast chart →Instant Yeast at a glance
Every number on this page comes from a single figure: 149 grams per US cup (NIST Handbook 133).
- 1 cup
- 149 g
- 1 tablespoon
- 9.31 g
- 1 teaspoon
- 3.1 g
- 1 cup in ounces
- 5.26 oz
- 100 g in cups
- 0.671 cups
- Density
- 0.63 g/ml
cups to grams chart for instant yeast
Print it, screenshot it, or bookmark this page — these are the amounts recipes ask for most often.
| Cups (US) | Grams | Ounces (weight) | Pounds |
|---|---|---|---|
| 1/8 cup | 18.6 g | 0.657 oz | 0.041 lb |
| 1/4 cup | 37.3 g | 1.31 oz | 0.082 lb |
| 1/3 cup | 49.7 g | 1.75 oz | 0.109 lb |
| 1/2 cup | 74.5 g | 2.63 oz | 0.164 lb |
| 2/3 cup | 99.3 g | 3.5 oz | 0.219 lb |
| 3/4 cup | 112 g | 3.94 oz | 0.246 lb |
| 1 cup | 149 g | 5.26 oz | 0.328 lb |
| 1 1/2 cup | 224 g | 7.88 oz | 0.493 lb |
| 2 cup | 298 g | 10.5 oz | 0.657 lb |
| 3 cup | 447 g | 15.8 oz | 0.985 lb |
| 4 cup | 596 g | 21 oz | 1.31 lb |
How this conversion is calculated
Volume-to-weight conversions are only as good as the density behind them. We treat instant yeast as 149 g per US customary cup, which works out to 0.630 g/ml. From there:
- Your cups figure is converted into millilitres or grams using standard unit sizes (cup = 237 ml).
- The density above bridges volume and weight in whichever direction you need.
- The result is rounded the way a cook would round it — to the nearest gram, or to a usable fraction such as 2/3 cups.
Measuring instant yeast accurately
Also sold as rapid-rise or bread machine yeast. Use about 25% less than active dry by weight for the same rise time.
If a recipe matters to you — bread, macarons, anything with a tight hydration or ratio — weigh it. A £10 digital scale removes the single largest source of variation in home baking, and it is faster than washing three measuring cups.
When cups are fine
- Liquids measured in a proper jug, where volume is the honest unit anyway.
- Forgiving savoury cooking: soups, stews, stir-fries, marinades.
- Small amounts of leaveners and spices, as long as you use level spoons.
Frequently asked questions
How many grams are in 1 cup of instant yeast?
1 cup of instant yeast is 149 g. This is based on a density of 149 g per US cup.
How many grams are in 2 cups of instant yeast?
2 cups of instant yeast is 298 g, and 74.5 g for half a cup.
How much is 100 g of instant yeast in cups?
100 g of instant yeast is about 2/3 cups. Weight is always the more reliable measurement, so use a scale when the recipe gives grams.
Why do other sites give a different number for instant yeast?
Also sold as rapid-rise or bread machine yeast. Use about 25% less than active dry by weight for the same rise time.
Do UK and Australian cups give the same result?
No. A US customary cup is 236.6 ml, a metric cup used in Australia and New Zealand is 250 ml, and an old UK imperial cup is 284 ml. Our default is the US cup, but you can pick metric cups in the converter.