One gram of molasses is 0.0029673591 cups, so converting grams of molasses to cups means multiplying by 0.0029673591. That factor is specific to this ingredient — it comes from its density, not from any relationship between the two units.
The density behind that figure is 1.4244 g per mL, against 1.00 for water. A cup of water weighs 236.6 g and a cup of molasses weighs 337 g, so this ingredient is 142.4% as heavy as the same volume of water — the single fact the whole page rests on.
A cup of molasses is 337 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 335.3 g and 340.4 g covers the range from lightly spooned to firmly packed. That 1% spread is larger than most of the adjustments recipes fuss over, and it disappears entirely the moment the ingredient is weighed instead.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.297% of a cup of molasses, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 1.484 cups, and a 1 kg pack 2.967.
The condition this weight assumes: What is left after sugar crystallises out, so almost all of its weight is dissolved solids.
The formula
grams- The amount of molasses you are converting, in grams
0.00296735905045- Cups per gram for molasses, from its density of 1.4244 g/mL
cups- The equivalent quantity in cups
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 0.00296735905045, the cups-per-gram figure for molasses.
- The result appears in cups, with a second reading in tbsp 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 molasses in cups
A recipe calling for 50 g of molasses needs 0.148368 cups on the scale. The arithmetic is 50 × 0.0029673591 = 0.14836795, and halving the recipe halves the weight to 0.074184 cups.
150 g of molasses in cups
Take 150 g of molasses: 150 × 0.0029673591 gives 0.445104 cups. Doubling the batch takes it to 0.890208 cups, because the relationship is a straight proportion once the density is known.
500 g of molasses in cups
A recipe calling for 500 g of molasses needs 1.48368 cups on the scale. The arithmetic is 500 × 0.0029673591 = 1.4836795, and halving the recipe halves the weight to 0.74184 cups.
How to read your score
Frequently asked questions
How many cups are in 1 g of molasses?
One gram of molasses is 0.0029673591 cups. Half that quantity is 0.00148368 cups and double it is 0.00593472 cups, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of molasses not 236 g like water?
Because weight per cup depends on what is in the cup. Molasses has a density of 1.4244 g per mL where water has 1.00, so a cup of it weighs 337 g rather than 236.6 g. That is a difference of 100.4 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?
Barely. Molasses does not compress, so a cup of it is 337 g however it is poured — within about 1%, which is inside the accuracy of a domestic scale. This is the group where measuring by volume is defensible.
Is a fluid ounce of molasses 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 molasses weighs 1.486 oz, so the two readings differ by 48.6%. 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 molasses would weigh 356.1 g instead of 337 g — 19.1 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?
A scale, if the result matters. Volume measuring carries a spread of about 1% for molasses — roughly 3.37 g on a 337 g cup — while a domestic scale is accurate to a gram or two. For anything where the ratio of ingredients drives the outcome, bread and pastry above all, weigh it.
How much does 2 cup of molasses weigh?
2 cup of molasses comes to 674 g, or 674 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the cups-to-grams page does it in the direction the question is usually asked.
Molasses in grams and cups
| Grams | Cups | Unrounded |
|---|---|---|
| 5 g | 0.0148368 cup | 0.01483679525 |
| 10 g | 0.0296736 cup | 0.0296735905 |
| 25 g | 0.074184 cup | 0.07418397626 |
| 50 g | 0.148368 cup | 0.1483679525 |
| 100 g | 0.296736 cup | 0.296735905 |
| 125 g | 0.37092 cup | 0.3709198813 |
| 150 g | 0.445104 cup | 0.4451038576 |
| 200 g | 0.593472 cup | 0.5934718101 |
| 250 g | 0.74184 cup | 0.7418397626 |
| 300 g | 0.890208 cup | 0.8902077151 |
| 500 g | 1.48368 cup | 1.483679525 |
| 1000 g | 2.96736 cup | 2.96735905 |
Based on 337 g per cup of molasses. One gram of molasses is 0.0029673591 cups.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 337 g | 11.9 oz | 236.6 mL |
| 3/4 cup | 252.8 g | 8.92 oz | 177.4 mL |
| 2/3 cup | 224.7 g | 7.92 oz | 157.7 mL |
| 1/2 cup | 168.5 g | 5.94 oz | 118.3 mL |
| 1/3 cup | 112.3 g | 3.96 oz | 78.86 mL |
| 1/4 cup | 84.25 g | 2.97 oz | 59.15 mL |
| 1 tbsp | 21.06 g | 0.743 oz | 14.79 mL |
| 1 tsp | 7.021 g | 0.248 oz | 4.929 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) |
|---|---|---|---|
| Peanut butter | 258 g | 9.101 oz | 1.091 |
| Sweetened condensed milk | 306 g | 10.79 oz | 1.293 |
| Maple syrup | 322 g | 11.36 oz | 1.361 |
| Corn syrup | 328 g | 11.57 oz | 1.386 |
| Agave nectar | 331 g | 11.68 oz | 1.399 |
| Molasses (this page) | 337 g | 11.89 oz | 1.424 |
| Honey | 340 g | 11.99 oz | 1.437 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.