Molasses — Grams & Cups Converter
1 cup of molasses (also called treacle) weighs about 337 g. So 100 g ≈ 1/3 cup, 200 g ≈ 5/8 cup, and 300 g ≈ 7/8 cup. Convert any amount between grams, cups, ounces, tablespoons and millilitres with the calculator below.
💡 Tip: Oil the cup so molasses releases cleanly. Blackstrap is much more bitter and concentrated — don't swap it 1:1 for regular molasses.
Cups to grams chart for molasses
| Cups | Grams | Ounces |
|---|---|---|
| 1/4 | 84.3 | 2.97 |
| 1/3 | 112 | 3.96 |
| 1/2 | 169 | 5.94 |
| 2/3 | 225 | 7.92 |
| 3/4 | 253 | 8.92 |
| 1 | 337 | 11.9 |
| 1 1/2 | 506 | 17.8 |
| 2 | 674 | 23.8 |
| 3 | 1011 | 35.7 |
Grams to cups chart for molasses
| Grams | Cups | Ounces |
|---|---|---|
| 10 | 0 | 0.35 |
| 25 | 1/8 | 0.88 |
| 50 | 1/8 | 1.76 |
| 75 | 1/4 | 2.65 |
| 100 | 1/3 | 3.53 |
| 125 | 3/8 | 4.41 |
| 150 | 1/2 | 5.29 |
| 200 | 5/8 | 7.05 |
| 250 | 3/4 | 8.82 |
| 300 | 7/8 | 10.6 |
| 500 | 1 1/2 | 17.6 |
Spoon reference: 1 tablespoon ≈ 21.1 g, 1 teaspoon ≈ 7.02 g.
Molasses, treacle and the blackstrap warning
Molasses is thick and heavy — a cup weighs about 337 g (11.9 oz), with each tablespoon around 21 g. Oil the cup or spoon first so it releases cleanly. In the UK, dark treacle is the closest equivalent, while golden syrup is much milder and not a true swap. There are grades: mild (light), full/dark, and blackstrap, which is the most concentrated and bitter — don't substitute it 1:1 for regular molasses or your gingerbread will turn harsh. Molasses adds moisture and acidity, which is why recipes using it often pair it with baking soda.
Frequently asked questions
- How many grams is 1 cup of molasses?
- 1 US cup of molasses weighs about 337 grams (11.9 ounces).
- How many cups is 100g of molasses?
- 100 grams of molasses is about 1/3 cup.
- How many cups is 200g of molasses?
- 200 grams of molasses is about 5/8 cup.
- How many cups is 250g of molasses?
- 250 grams of molasses is about 3/4 cup.
- How many cups is 300g of molasses?
- 300 grams of molasses is about 7/8 cup.
- How many cups is 500g of molasses?
- 500 grams of molasses is about 1 1/2 cups.
- How many grams is ½ cup of molasses?
- Half a US cup of molasses is about 169 grams.
- How much does 1 cup of molasses weigh?
- 1 cup of molasses weighs about 337 grams, or roughly 11.9 ounces.
- How many grams in a tablespoon of molasses?
- About 21.1 grams per tablespoon (and roughly 7.02 g per teaspoon).
- Why do my numbers differ slightly?
- Density changes with how the molasses is packed, sifted or measured. For precise baking, weigh with a scale instead of using cups.
- How many grams is 2 cups of molasses?
- About 674 g, based on roughly 337 g per cup.
- How many cups is 150g of molasses?
- About ½ cup.
- Is molasses the same as treacle?
- Closely — UK dark or black treacle is the nearest equivalent to molasses. Golden syrup is far milder and isn't a direct substitute.
- Can I use blackstrap molasses instead of regular molasses?
- Not 1:1 — blackstrap is much more concentrated and bitter, so use less or it will overpower the recipe.
- What can I substitute for molasses?
- Dark treacle, or a mix of brown sugar with a little water; honey or maple syrup work for sweetness but lack the deep flavour.