Molasses: Grams to Cups
1 cup of molasses = 337 grams
One US cup of molasses weighs 337 grams. One 250 ml metric cup — the one used in the UK, Australia, New Zealand and Canada — holds 356 grams. To convert any weight, divide the grams by the figure for your cup.
Molasses weighs 337 g per cup (USDA FoodData Central; King Arthur Baking's 85 g per ¼ cup gives 340 g). Blackstrap is thicker and a little heavier. Oil the cup first so it pours out cleanly.
Where the 337 g figure comes from
- USDA FoodData Central: 1 cup of “Molasses” = 337 g (FDC ID 168820)
- King Arthur Baking ingredient weight chart: Molasses, 1/4 cup = 85 g (about 340 g per cup) (chart)
This site uses 337 g per US cup of molasses, spooned and levelled. References checked September 2026.
How many cups is X grams of molasses?
| Grams | US cups | Metric cups | Tablespoons | Ounces |
|---|---|---|---|---|
| 25 g molasses | ⅛ | ⅛ | 1.19 | 0.88 |
| 50 g molasses | ⅛ | ⅛ | 2.37 | 1.76 |
| 75 g molasses | ¼ | ¼ | 3.56 | 2.65 |
| 100 g molasses | ⅓ | ¼ | 4.75 | 3.53 |
| 110 g molasses | ⅓ | ⅓ | 5.22 | 3.88 |
| 120 g molasses | ⅜ | ⅓ | 5.7 | 4.23 |
| 125 g molasses | ⅜ | ⅓ | 5.93 | 4.41 |
| 130 g molasses | ⅜ | ⅜ | 6.17 | 4.59 |
| 140 g molasses | ⅜ | ⅜ | 6.65 | 4.94 |
| 150 g molasses | ½ | ⅜ | 7.12 | 5.29 |
| 170 g molasses | ½ | ½ | 8.07 | 6.00 |
| 175 g molasses | ½ | ½ | 8.31 | 6.17 |
| 200 g molasses | ⅝ | 0.56 | 9.5 | 7.05 |
| 225 g molasses | ⅔ | ⅝ | 10.68 | 7.94 |
| 240 g molasses | ¾ | ⅔ | 11.39 | 8.47 |
| 250 g molasses | ¾ | ⅔ | 11.87 | 8.82 |
| 275 g molasses | ⅞ | ¾ | 13.06 | 9.70 |
| 300 g molasses | ⅞ | ⅞ | 14.24 | 10.58 |
| 350 g molasses | 1 | 1 | 16.62 | 12.35 |
| 400 g molasses | 1.19 | 1⅛ | 18.99 | 14.11 |
| 450 g molasses | 1⅓ | 1¼ | 21.36 | 15.87 |
| 500 g molasses | 1½ | 1⅜ | 23.74 | 17.64 |
How to measure molasses accurately
The 337 g figure assumes the spooned-and-levelled method: spoon the molasses into a dry measuring cup and sweep the top flat with a straight edge. Scooping the cup through the bag compacts it and gives a heavier cup.
- 1 US cup of molasses = 337 g
- 1 metric cup (250 ml) of molasses = 356 g
- ¾ cup = 253 g
- ½ cup = 169 g
- ⅓ cup = 112 g
- ¼ cup = 84 g
- 1 tablespoon = 21.1 g
Frequently asked questions
How many cups is 100 grams of molasses?
100 grams of molasses is about ⅓ US cups, based on 337 g per cup, or ¼ metric cups.
How many grams in a cup of molasses?
One US cup of molasses weighs 337 grams. A 250 ml metric cup holds 356 grams.
How many cups is 250 grams of molasses?
250 grams of molasses is about ¾ US cups, or ⅔ metric cups.
Does a UK cup of molasses weigh the same as a US cup?
No. A UK, Australian or Canadian metric cup is 250 ml against the US 236.6 ml, so it holds about 5.7% more — 356 g of molasses rather than 337 g.
How many tablespoons is 100 grams of molasses?
100 grams of molasses is about 4.75 tablespoons.