1 Cup Tomato Sauce in Grams

1 cup of tomato sauce weighs 245 g (spooned and levelled, USDA). Smooth, cooked tomato sauce, lightly seasoned. All the figures on this page are approximate conversions based on the USDA value, so when a recipe really matters, verify with a kitchen scale.

Why weighing tomato sauce beats measuring it in cups

Tomato sauce weighs 245 g per cup, close to the weight of water, because it is a smooth, cooked sauce that is mostly water with tomato solids and a little seasoning. The smoothness makes the cup measure relatively reliable: tomato sauce pours, levels itself, and traps little air, unlike tomato paste, which clings and traps air. Even so, a cup of tomato sauce poured from the jar can be a little short, because the sauce leaves a film on the cup, and a recipe that needs a full cup for a pasta sauce will be short on sauce if the measure is careless.

The distinction between tomato sauce, tomato paste and ketchup is the detail that catches cooks out. Tomato sauce is a smooth, lightly seasoned sauce for pasta and pizza; tomato paste is a concentrated paste used by the tablespoon; ketchup is a sweet, vinegary condiment. The three weigh differently per cup, 245 g, 262 g and 240 g, and they taste very differently, so swapping one for another without adjusting the recipe changes the dish. Tomato sauce is also sold in many forms, from plain passata to heavily seasoned jarred sauce, and the seasoning varies by brand, so taste the sauce before you use it and adjust the salt and sugar in the recipe.

Tomato Sauce cups to grams conversion table

Cups Grams Tablespoons
1/4 cup 61.2 g 4
1/3 cup 81.7 g 5.3
1/2 cup 122.5 g 8
2/3 cup 163.3 g 10.7
3/4 cup 183.8 g 12
1 cup 245 g 16
1 1/2 cups 367.5 g 24
2 cups 490 g 32
3 cups 735 g 48
4 cups 980 g 64

One tablespoon of tomato sauce weighs about 15.3 g, since a cup is 16 tablespoons. That is useful when a recipe calls for a spoonful or two rather than a whole cup, though 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.

Worked examples

Pasta sauce for six

A pasta sauce for six people uses about 2 cups of tomato sauce, which is 490 g, simmered with garlic, onion, herbs and olive oil for 20 minutes. Weigh 490 g rather than pouring from the jar, because the sauce clings to the measuring cup and a poured measure can be 20 g short. Simmer the sauce gently so it thickens slightly without reducing too much, and season at the end.

Pizza sauce for four pizzas

A pizza sauce for four pizzas uses about 1 cup of tomato sauce, which is 245 g, spread thinly over the bases. Weigh 245 g so each pizza gets the same amount of sauce, and spread it thinly: too much sauce makes the base soggy, too little and the pizza is dry. Use a smooth sauce without chunks, because chunks tear the base when they are spread.

Braised chicken for four

Braised chicken for four people uses about 1 1/2 cups of tomato sauce, which is 368 g, poured over the browned chicken with olives and herbs, then simmered until the chicken is tender. Weigh 368 g so the braising liquid is deep enough to cook the chicken without drowning it, and check the seasoning at the end, because jarred sauces vary in salt.

How the weight was measured

How you fill the cup decides what the cup weighs. The method used here is spooned and levelled: the ingredient is spooned into the cup and levelled with a straight edge, never scooped and never tapped down. If you scoop, you compress the ingredient and the same cup can weigh noticeably more, which is the single most common reason a recipe that worked for its author fails in another kitchen.

The value is taken from USDA with medium confidence. USDA is the reference used across this site because its chart is consistent and widely used by recipe developers. No other source was mixed in, and nothing on this page was estimated from a different ingredient. Remember that every conversion on this page is approximate: check the weight on a kitchen scale whenever accuracy matters, and use the table as a guide rather than a guarantee.

Practical guidance

Refrigerate tomato sauce after opening and use it within 1 week, because it is a cooked sauce with no preservatives in most jars. Stir the jar before measuring, because the sauce can separate, and pour it slowly into the cup so it levels itself. When a recipe calls for tomato sauce by the cup, weighing it is still more reliable than measuring it, because the sauce leaves a film on the cup. If you do not have a scale, pour slowly and level the top, remembering that the 245 g figure is approximate and medium confidence. Check whether your sauce is plain or seasoned: a heavily seasoned jarred sauce needs less salt and sugar added than a plain passata.

Common mistakes with condiments and sauces

The most common mistake is measuring thick sauces by the cup as if they poured like water. Tomato paste, mayonnaise and jam cling to the cup, trap air, and leave a film behind, so the amount that reaches the pan is less than the amount measured. A scale removes the problem entirely: weigh the jar before and after, or spoon the sauce onto the scale. The second mistake is eyeballing a tablespoon of paste or jam from the jar and calling it a cup's worth of accuracy; small errors in concentrated ingredients are large errors in flavour. The third is storing opened sauces at room temperature for weeks: most need the fridge once opened, and a sauce that has turned will spoil a whole dish. Finally, do not swap one sauce for another by volume alone: a cup of tomato paste and a cup of tomato sauce differ in concentration, salt and water, so the swap changes the recipe, not just the weight.

Frequently asked questions

How many grams is 1 cup of tomato sauce?

1 cup of tomato sauce weighs 245 g when spooned and levelled, according to the USDA. The figure is medium confidence and approximate, because brands vary in thickness and seasoning, so verify with a kitchen scale when it matters.

Is tomato sauce the same as tomato paste?

No. Tomato sauce is a smooth, lightly seasoned sauce used by the cup, while tomato paste is a concentrated paste used by the tablespoon. A cup of tomato sauce is 245 g and a cup of tomato paste is 262 g, and the two taste very differently.

How many cups is 400 g of tomato sauce?

400 g of tomato sauce is about 1.63 cups, or 1 cup plus 2/3 cup. At 245 g per cup, divide 400 by 245 to get the answer, and use a scale for the most accurate result.

How long does opened tomato sauce keep?

Refrigerate it after opening and use it within 1 week. An opened jar spoils quickly, especially in a warm fridge, so freeze any leftover sauce in portions if you will not use it in time.

Can I use ketchup instead of tomato sauce?

In some recipes, yes, but ketchup is much sweeter and more vinegary than tomato sauce, so the flavour changes. Weigh the ketchup and reduce the sugar and vinegar elsewhere in the recipe to compensate.

Related conversions

If you need a different amount, the table above scales in both directions, and the converter tool will do the maths for any quantity. When a recipe really matters, weigh the ingredient on a kitchen scale rather than trusting the cup alone, because the figures on this page are approximate and natural ingredients vary by brand, variety and moisture.