Sugars & Syrups
Convert cups of molasses to grams
One cup of molasses weighs about 328 g, and half a cup comes to roughly 164 g. Enter any amount below to convert it, or use the chart further down as a quick reference while you cook.
1 cup of molasses =
328 g
- oz
- 11.6
- kg
- 0.328
- lb
- 0.723
Molasses: 328 g per US cup · USDA FoodData Central. Blackstrap molasses is slightly denser than light molasses. Warm the jar for a cleaner pour.
Full molasses chart →Molasses at a glance
Every number on this page comes from a single figure: 328 grams per US cup (USDA FoodData Central).
- 1 cup
- 328 g
- 1 tablespoon
- 20.5 g
- 1 teaspoon
- 6.83 g
- 1 cup in ounces
- 11.6 oz
- 100 g in cups
- 0.305 cups
- Density
- 1.39 g/ml
cups to grams chart for molasses
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 | 41 g | 1.45 oz | 0.09 lb |
| 1/4 cup | 82 g | 2.89 oz | 0.181 lb |
| 1/3 cup | 109 g | 3.86 oz | 0.241 lb |
| 1/2 cup | 164 g | 5.78 oz | 0.362 lb |
| 2/3 cup | 219 g | 7.71 oz | 0.482 lb |
| 3/4 cup | 246 g | 8.68 oz | 0.542 lb |
| 1 cup | 328 g | 11.6 oz | 0.723 lb |
| 1 1/2 cup | 492 g | 17.4 oz | 1.08 lb |
| 2 cup | 656 g | 23.1 oz | 1.45 lb |
| 3 cup | 984 g | 34.7 oz | 2.17 lb |
| 4 cup | 1312 g | 46.3 oz | 2.89 lb |
How this conversion is calculated
Volume-to-weight conversions are only as good as the density behind them. We treat molasses as 328 g per US customary cup, which works out to 1.386 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 1/3 cups.
Measuring molasses accurately
Blackstrap molasses is slightly denser than light molasses. Warm the jar for a cleaner pour.
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 molasses?
1 cup of molasses is 328 g. This is based on a density of 328 g per US cup.
How many grams are in 2 cups of molasses?
2 cups of molasses is 656 g, and 164 g for half a cup.
How much is 100 g of molasses in cups?
100 g of molasses is about 1/3 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 molasses?
Blackstrap molasses is slightly denser than light molasses. Warm the jar for a cleaner pour.
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.