CupsToGrams kitchen card
1 US cup = 240 ml, 1 tablespoon = 15 ml, 1 teaspoon = 5 ml. Figures verified 5 August 2026. https://cupsngrams.com/molasses
Molasses: Cups to Grams
One US cup (240 ml) of molasses weighs 337 grams; half a cup weighs 169 grams. A quarter cup is 84.3 grams, a tablespoon is 21.1 grams and a teaspoon is 7.02 grams. A cup measures volume, not weight, so these numbers are for molasses only: a cup of all-purpose flour weighs 125 grams.
337 g
1 cup of molasses = 337 g (US legal cup, 240 ml)
1 cup of molasses = 337 g (US legal cup, 240 ml)
Based on molasses at 337 g per US cup.
CupsToGrams, cupsngrams.com
Baking from a UK, Australian or New Zealand recipe? Their cup is not the American one. Pick the standard your recipe assumes and every cup figure follows it.
Molasses conversion table
| Cups | Cups (decimal) | Grams | Tablespoons | Millilitres | Ounces (weight) |
|---|---|---|---|---|---|
| 1/8 cup | 0.125 | 42.1 g | 2 tbsp | 30 ml | 1.49 oz |
| 1/4 cup | 0.25 | 84.3 g | 4 tbsp | 60 ml | 2.97 oz |
| 1/3 cup | 0.33 | 112 g | 5.33 tbsp | 80 ml | 3.96 oz |
| 1/2 cup | 0.5 | 169 g | 8 tbsp | 120 ml | 5.94 oz |
| 2/3 cup | 0.67 | 225 g | 10.7 tbsp | 160 ml | 7.92 oz |
| 3/4 cup | 0.75 | 253 g | 12 tbsp | 180 ml | 8.92 oz |
| 1 cup | 1 | 337 g | 16 tbsp | 240 ml | 11.9 oz |
| 1 1/4 cups | 1.25 | 421 g | 20 tbsp | 300 ml | 14.9 oz |
| 1 1/3 cups | 1.33 | 449 g | 21.3 tbsp | 320 ml | 15.8 oz |
| 1 1/2 cups | 1.5 | 505 g | 24 tbsp | 360 ml | 17.8 oz |
| 1 2/3 cups | 1.67 | 562 g | 26.7 tbsp | 400 ml | 19.8 oz |
| 1 3/4 cups | 1.75 | 590 g | 28 tbsp | 420 ml | 20.8 oz |
| 2 cups | 2 | 674 g | 32 tbsp | 480 ml | 23.8 oz |
| 2 1/4 cups | 2.25 | 758 g | 36 tbsp | 540 ml | 26.7 oz |
| 2 1/2 cups | 2.5 | 842 g | 40 tbsp | 600 ml | 29.7 oz |
| 3 cups | 3 | 1011 g | 48 tbsp | 720 ml | 35.7 oz |
| 3 2/3 cups | 3.67 | 1236 g | 58.7 tbsp | 880 ml | 43.6 oz |
Ounces here are ounces of weight (1 oz = 28.35 g), not fluid ounces. One US cup is 8 fluid ounces of volume whatever is in it, but what it weighs in ounces depends on the ingredient: a cup of molasses weighs about 11.9 oz. Why these two are not the same. Decimals for thirds are rounded (1/3 cup is 0.333 cups), and each linked amount opens a page comparing every ingredient at that measure.
Cite this: CupsToGrams, "Molasses: Cups to Grams", https://cupsngrams.com/molasses, figures verified . The data is free to reuse under CC BY 4.0 with a link back to this page.
About measuring molasses
Molasses is the dark, bittersweet syrup left after sugar is refined, and it is very dense, so one US cup weighs about 337 grams. It is thick and slow to pour, so weighing straight into the bowl saves the frustration of coaxing it out of a measuring cup. Molasses brings both deep flavour and moisture to gingerbread, baked beans and dark cakes, so getting the amount right shapes both taste and texture.
Grease the cup or weigh molasses in the bowl. Its stickiness makes volume measuring messy.
How many grams is a cup of molasses?
One US cup (240 ml) of molasses weighs about 337 grams. Because a cup measures volume rather than weight, that figure is specific to molasses and does not transfer to any other ingredient: the same cup holds 125 grams of all-purpose flour and 340 grams of honey.
- 1/4 cup of molasses is about 84 grams
- 1/3 cup of molasses is about 112 grams
- 1/2 cup of molasses is about 169 grams
- 2/3 cup of molasses is about 225 grams
- 3/4 cup of molasses is about 253 grams
- 1 1/2 cups of molasses is about 505 grams
- 2 cups of molasses is about 674 grams
- 3 cups of molasses is about 1011 grams
Working the other way round, 100 grams of molasses is about 0.297 cups, and 500 grams is about 1.48 cups.
Does it matter which cup my recipe means?
It does, though less than the ingredient itself. This page uses the US legal cup of 240 ml. An Australian metric cup is 250 ml, so a metric cup of molasses comes to about 351 grams, and the old British imperial cup of 284.1 ml holds about 399 grams. See cup sizes by country for every standard side by side.
Frequently asked questions
How many grams is 1 cup of molasses?
One US cup of molasses is about 337 grams. It is one of the densest syrups, so it weighs well above a cup of water.
How many grams is a tablespoon of molasses?
About 21 grams. Molasses is dense and heavy, so a level tablespoon carries a good amount of weight.
How do I measure sticky molasses cleanly?
Lightly grease the measuring cup so it slides out, or better still weigh molasses straight into the bowl to avoid waste.
Where this figure comes from
We have not yet found a published reference that states a weight for a cup of molasses. The 337 grams on this page follows the calibration the rest of the site is built on, with butter at 227 grams per cup, water at 240, all-purpose flour at 125 and granulated sugar at 200. Treat it as a good working figure rather than a cited one. If you have a better source, tell us and we will check it and credit you.
Published figures for the same ingredient vary between references anyway, because how an ingredient is packed changes what a cup of it weighs. Treat any cup figure as accurate to within a few percent, and weigh on a scale when a recipe is sensitive. Our full approach is on the methodology page.
Figures last verified . Compiled by the CupsToGrams editorial team at FusionStudios. Spotted a value that looks off? Tell us.