2 Cups Molasses in Grams
2 cups of molasses weighs 680 g (poured, King Arthur Baking). That single number is the whole point of this page, but the reason it matters is that cups measure volume and recipes live or die by weight. Molasses is one of those ingredients where a cup can hide a surprisingly wide range of weights, so converting to grams takes the guesswork out. Every figure on this page is approximate and comes from the King Arthur Baking value for molasses, so when a recipe really matters, verify with a kitchen scale.
Why weighing molasses beats scooping it
Molasses is the kind of ingredient where the cup method quietly fails. A cup is a volume measure, and the weight of a volume depends on how tightly the ingredient is packed, how fine it is, and even how humid the kitchen is. Two people filling the same cup of molasses can easily end up with weights several grams apart, and in a recipe that calls for 2 cups, that difference doubles. Grams remove the variable entirely: 680 g of molasses is 680 g of molasses in any kitchen, on any day, in any hands. That is why professional recipes are written in grams, and why converting your cup measurements is the single cheapest upgrade you can make to your cooking. You do not need expensive equipment — a basic digital scale that reads to the gram costs less than a bag of good flour and pays for itself the first time a cake comes out right.
Molasses cups to grams conversion table
| Cups | Grams | Tablespoons (approx.) |
|---|---|---|
| 1/4 cup | 85 g | 5.3 g |
| 1/3 cup | 113.3 g | 7.1 g |
| 1/2 cup | 170 g | 10.6 g |
| 2/3 cup | 226.7 g | 14.2 g |
| 3/4 cup | 255 g | 15.9 g |
| 1 cup | 340 g | 21.2 g |
| 1 1/2 cups | 510 g | 31.9 g |
| 2 cups | 680 g | 42.5 g |
| 3 cups | 1020 g | 63.8 g |
| 4 cups | 1360 g | 85 g |
The tablespoon column is a bonus for recipes that call for a spoonful or two: one tablespoon of molasses weighs about 21.2 g. Remember that a cup is 16 tablespoons, so the numbers in the table are just the cup weight divided by 16, rounded sensibly. For small amounts a scale that reads to the gram is far more reliable than a spoon, because a heaped tablespoon can weigh half as much again as a level one.
How the weight was measured
Poured means the ingredient was measured the way King Arthur Baking measures it: poured into a liquid measuring jug and read at eye level at the meniscus. Liquids do not pack, so the main source of error is reading the jug from above or using a dry cup for a liquid measure. The source for the 340 g per cup figure is King Arthur Baking, and the confidence in the value is high. King Arthur Baking publishes a standard ingredient weight chart that recipe developers use as a reference, and this page follows it exactly rather than averaging across sources, because an average of two different measuring methods is a number that matches nobody's cup.
Worked examples
A jam or preserve batch
Preserves depend on the sugar ratio for setting and for keeping quality, so guessing is risky. A recipe calling for 2 cups of molasses needs 680 g weighed out before you start, because once the fruit is boiling you do not want to be measuring sugar. Weigh it into a bowl first, and the rest of the process runs smoothly.
Scaling a cake recipe for a crowd
A cake that serves eight and uses 1 cup of molasses becomes a cake for sixteen with 2 cups, or 680 g. Scaling sugar by volume compounds the error, and sugar is the ingredient where a 10% error is most noticeable — too little and the cake is dry and pale, too much and it is cloying and sinks. Weigh it, and the doubled cake behaves exactly like the original.
A meringue where every gram counts
Meringue is one of the least forgiving things you can bake: the sugar must dissolve fully and the ratio to egg white must be right. For a meringue using 2 cups of molasses, weigh 680 g rather than trusting a cup. Fine sugar dissolves faster, so if your sugar is coarse, give it an extra minute of whisking and check for grittiness between your fingers before piping.
Common mistakes with molasses
The most common mistake is scooping the cup through the container instead of spooning and levelling. Scooping packs the ingredient and can add 10 to 20 percent extra weight — enough to ruin a bake. The second mistake is using a liquid measuring jug for a dry ingredient, or a dry cup for a liquid: the two are calibrated differently and the meniscus on a jug is hard to read at 2 cups. The third mistake is forgetting to tare the scale, so the weight of the bowl gets counted as ingredient. Put the bowl on the scale, press tare so the display reads zero, and then add the ingredient. Finally, do not trust a cup that has been sitting in a humid kitchen: molasses absorbs moisture from the air, and a cup weighed on a damp day is heavier than the same cup on a dry day. The scale does not care about humidity — it tells you what is actually there.
Frequently asked questions
How many grams is 2 cups of molasses?
2 cups of molasses weighs approximately 680 g, measured poured. The figure comes from the King Arthur Baking value of 340 g per cup. All weights on this page are approximate — verify with a kitchen scale when precision matters.
How many cups is 680 g of molasses?
680 g of molasses is 2 cups — the conversion works in both directions, since 340 g equals one cup. If your recipe is written in grams and your tools are cups, divide the gram weight by 340 to get cups.
How do I measure molasses without a scale?
Use the spoon-and-level method: spoon molasses into a dry measuring cup until it is heaped above the rim, then level it with the back of a knife. Do not scoop the cup through the bag and do not tap it down. For 2 cups, repeat for a second cup. It is less accurate than weighing 680 g, but it is the best cup method available.
Does the brand of molasses change the weight?
It can, by a few grams per cup. Different brands mill, grind or process molasses slightly differently, and moisture content varies with storage. The King Arthur Baking value of 340 g per cup is a standard reference, not a measurement of your specific packet — another reason to verify with a scale for important recipes.
What is the easiest way to weigh 2 cups of molasses?
Put your mixing bowl on a digital scale, press tare to zero it, and pour or spoon in molasses until the display reads 680 g. Add other dry ingredients on top, taring between each one, and you can measure a whole recipe in one bowl with no extra washing up.