1/3 Cup Tomato Sauce in Grams
1/3 cup of tomato sauce weighs 81.7 g (spooned and levelled, USDA). 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. Tomato Sauce 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 USDA value for tomato sauce, so when a recipe really matters, verify with a kitchen scale.
Why weighing tomato sauce beats scooping it
Tomato Sauce 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 tomato sauce can easily end up with weights several grams apart, and in a recipe that calls for 1/3 cup, that difference doubles. Grams remove the variable entirely: 81.7 g of tomato sauce is 81.7 g of tomato sauce 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.
Tomato Sauce cups to grams conversion table
| Cups | Grams | Tablespoons (approx.) |
|---|---|---|
| 1/4 cup | 61.2 g | 3.8 g |
| 1/3 cup | 81.7 g | 5.1 g |
| 1/2 cup | 122.5 g | 7.7 g |
| 2/3 cup | 163.3 g | 10.2 g |
| 3/4 cup | 183.8 g | 11.5 g |
| 1 cup | 245 g | 15.3 g |
| 1 1/2 cups | 367.5 g | 23 g |
| 2 cups | 490 g | 30.6 g |
| 3 cups | 735 g | 45.9 g |
| 4 cups | 980 g | 61.2 g |
The tablespoon column is a bonus for recipes that call for a spoonful or two: one tablespoon of tomato sauce weighs about 15.3 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
Spooned and levelled means the ingredient was measured the way USDA measures it: spooned into the measuring cup until heaped, then levelled with a straight edge. Never scoop the cup through the bag or jar, and never tap the cup down, because both pack the ingredient and add weight. The source for the 245 g per cup figure is USDA, and the confidence in the value is medium. USDA 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 sauce that needs thickening
A sauce recipe calling for 1/3 cup of tomato sauce needs 81.7 g. Adding it gradually and whisking as you go is the safe route: you can always add more, but you cannot take it out. Weigh the full amount first, then add it in two or three stages until the sauce coats the back of a spoon.
Meal prep for the week
Cooking in bulk is where weighing earns its keep. A week of lunches built around 1/3 cup of tomato sauce starts with 81.7 g measured once, and the portions come out identical across five containers. That consistency is what makes meal prep actually work instead of turning into five slightly different meals.
A dressing made in a jar
A jar dressing built on 1/3 cup of tomato sauce needs 81.7 g. Put the ingredient in the jar first, add the rest, shake, and taste. Weighing the base ingredient means the ratio of the dressing is right before you season it, so the salt and acid you add are adjusting flavour, not fixing a broken ratio.
Common mistakes with tomato sauce
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 1/3 cup. 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: tomato sauce 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 1/3 cup of tomato sauce?
1/3 cup of tomato sauce weighs approximately 81.7 g, measured spooned and levelled. The figure comes from the USDA value of 245 g per cup. All weights on this page are approximate — verify with a kitchen scale when precision matters.
How many cups is 81.7 g of tomato sauce?
81.7 g of tomato sauce is 1/3 cup — the conversion works in both directions, since 245 g equals one cup. If your recipe is written in grams and your tools are cups, divide the gram weight by 245 to get cups.
How do I measure tomato sauce without a scale?
Use the spoon-and-level method: spoon tomato sauce 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 1/3 cup, repeat for a second cup. It is less accurate than weighing 81.7 g, but it is the best cup method available.
Does the brand of tomato sauce change the weight?
It can, by a few grams per cup. Different brands mill, grind or process tomato sauce slightly differently, and moisture content varies with storage. The USDA value of 245 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 1/3 cup of tomato sauce?
Put your mixing bowl on a digital scale, press tare to zero it, and pour or spoon in tomato sauce until the display reads 81.7 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.