Grams of instant yeast to millilitres runs on one number, 1.6429739 millilitres per gram. It is a measured property of this ingredient rather than a defined conversion, which is why a generic volume-to-weight tool cannot give you it.
Water is the yardstick: 1 mL of it weighs 1 g. Instant yeast comes in at 0.60865 g per mL, or 60.87% of water, which is why a cup of it is 144 g rather than 236.6 g. Volume and weight only line up for water, and only in metric.
Instant yeast has a density of 0.60865 g per mL, so 100 mL of it weighs 60.87 g and 250 mL weighs 152.2 g. That single figure is what every other number on this page is built from — water is 1.00 g per mL, so this ingredient is 60.87% as heavy as the same volume of water.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.694% of a cup of instant yeast, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 3.472 cups, and a 1 kg pack 6.944.
How the figure is arrived at: Three grams to a teaspoon, so a standard 7 g sachet is a little over two and a quarter teaspoons.
The formula
grams- The amount of instant yeast you are converting, in grams
1.64297386458- Millilitres per gram for instant yeast, from its density of 0.60865 g/mL
millilitres- The equivalent quantity in millilitres
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 1.64297386458, the millilitres-per-gram figure for instant yeast.
- The result appears in millilitres, with a second reading in tsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
50 g of instant yeast in millilitres
A recipe calling for 50 g of instant yeast needs 82.1487 millilitres on the scale. The arithmetic is 50 × 1.6429739 = 82.148693, and halving the recipe halves the weight to 41.0743 millilitres.
150 g of instant yeast in millilitres
150 g of instant yeast weighs out at 246.446 millilitres. Divide 246.446 by 1.6429739 and you get back to 150 g, which is the quickest check that the factor is the right way up.
500 g of instant yeast in millilitres
Take 500 g of instant yeast: 500 × 1.6429739 gives 821.487 millilitres. Doubling the batch takes it to 1642.97 millilitres, because the relationship is a straight proportion once the density is known.
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Frequently asked questions
How many millilitres are in 1 g of instant yeast?
One gram of instant yeast is 1.6429739 millilitres. Half that quantity is 0.821487 millilitres and double it is 3.28595 millilitres, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of instant yeast not 236 g like water?
Because weight per cup depends on what is in the cup. Instant yeast has a density of 0.60865 g per mL where water has 1.00, so a cup of it weighs 144 g rather than 236.6 g. That is a difference of 92.6 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Yes, and by more than most people expect. Handling changes the weight of a cup of instant yeast by roughly 20% — about 14.4 g either side of 144 g — because three grams to a teaspoon, so a standard 7 g sachet is a little over two and a quarter teaspoons. Weighing removes the question entirely.
Is a fluid ounce of instant yeast the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of instant yeast weighs 0.6349 oz, so the two readings differ by 36.5%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of instant yeast would weigh 152.16 g instead of 144 g — 8.16 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
At this size the spoon wins. One millilitre of instant yeast is 0.6087 g, and a scale reading to the nearest gram is working at 164% resolution on that — a measuring spoon is the more accurate instrument below about 5 g, which is why spice quantities are still written in spoons.
How much does 15 mL of instant yeast weigh?
15 mL of instant yeast comes to 9.1298 g, or 9.1298 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the ml-to-grams page does it in the direction the question is usually asked.
Instant yeast in grams and millilitres
| Grams | Millilitres | Unrounded |
|---|---|---|
| 5 g | 8.21487 mL | 8.214869323 |
| 10 g | 16.4297 mL | 16.42973865 |
| 25 g | 41.0743 mL | 41.07434661 |
| 50 g | 82.1487 mL | 82.14869323 |
| 100 g | 164.297 mL | 164.2973865 |
| 125 g | 205.372 mL | 205.3717331 |
| 150 g | 246.446 mL | 246.4460797 |
| 200 g | 328.595 mL | 328.5947729 |
| 250 g | 410.743 mL | 410.7434661 |
| 300 g | 492.892 mL | 492.8921594 |
| 500 g | 821.487 mL | 821.4869323 |
| 1000 g | 1642.97 mL | 1642.973865 |
Based on 144 g per cup of instant yeast. One gram of instant yeast is 1.6429739 millilitres.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 144 g | 5.08 oz | 236.6 mL |
| 1 tbsp | 9 g | 0.317 oz | 14.79 mL |
| 2 tsp | 6 g | 0.212 oz | 9.858 mL |
| 1 tsp | 3 g | 0.106 oz | 4.929 mL |
| 3/4 tsp | 2.25 g | 0.0794 oz | 3.697 mL |
| 1/2 tsp | 1.5 g | 0.0529 oz | 2.464 mL |
| 1/4 tsp | 0.75 g | 0.0265 oz | 1.232 mL |
| 1/8 tsp | 0.375 g | 0.0132 oz | 0.6161 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Ground cinnamon | 125 g | 4.409 oz | 0.5283 |
| Chili powder | 125 g | 4.409 oz | 0.5283 |
| Garlic powder | 134 g | 4.727 oz | 0.5664 |
| Instant yeast (this page) | 144 g | 5.079 oz | 0.6087 |
| Ground turmeric | 144 g | 5.079 oz | 0.6087 |
| Powdered gelatin | 150 g | 5.291 oz | 0.634 |
| Baking powder | 192 g | 6.773 oz | 0.8115 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.