A cup of tomato sauce is 245 g — the USDA figure, measured spooned and levelled. Smooth, cooked tomato sauce, lightly seasoned. It is used for pasta, pizza, braising and soups. It is the ready-to-use tomato product, smooth and lightly seasoned, and at 245 g per cup it is nearly as heavy as tomato paste. The difference between the two is concentration: tomato sauce is ready to pour, while paste needs diluting, and knowing which one a recipe wants is the difference between a sauce that works and one that does not. This guide covers the weight of tomato sauce in every measure you will use — cups, tablespoons and teaspoons — how to measure it correctly, what to use instead when you run out, and how to store it. All weights on this page are approximate; verify with a kitchen scale when the recipe matters.
Tomato Sauce: weight and measurement table
The table below gives the weight of Tomato Sauce in every measure you will use, from a teaspoon up to 2 cups, all derived from the USDA figure of 245 g per cup, spooned and levelled. Every figure is approximate — spooned and levelled is a technique, not a machine setting — so when the recipe matters, weigh the ingredient on a kitchen scale instead.
| Amount | Weight (approx.) |
|---|---|
| 1 teaspoon | 5.1 g |
| 1 tablespoon | 15.3 g |
| 1/4 cup (4 tbsp) | 61.2 g |
| 1/3 cup | 81.7 g |
| 1/2 cup (8 tbsp) | 122.5 g |
| 3/4 cup (12 tbsp) | 183.8 g |
| 1 cup (16 tbsp) | 245 g |
| 2 cups | 490 g |
| 100 g | 0.41 cups |
There are 3 teaspoons in a tablespoon and 16 tablespoons in a cup, so you can move between any of these measures by multiplying or dividing. If a recipe calls for 100 g and you only have measuring cups, that is about 0.41 cups. Keep the cups to grams converter open while you cook and you will never need to do the arithmetic in your head.
What is Tomato Sauce?
Smooth, cooked tomato sauce, lightly seasoned. Tomato Sauce is used for pasta, pizza, braising and soups. The ingredient is a familiar one in most kitchens, but it is worth knowing what it actually is before you measure it, because the form it comes in decides how it behaves in a recipe. Tomato Sauce as sold is the form the weight on this page refers to: 245 g per cup, spooned and levelled, from USDA. If you buy it in a different form — chopped, ground, toasted, sweetened or unsweetened — the weight per cup changes, sometimes by a lot, so weigh the ingredient in the form the recipe asks for, or weigh it before you change its form. That single habit, weighing before chopping, grinding or toasting, is what keeps the recipe consistent from one bake to the next.
How to measure Tomato Sauce
Spoon the tomato sauce lightly into the measuring cup or spoon, then level the top with the back of a knife. Do not scoop the measure straight from the bag or the jar, because scooping packs the ingredient down and adds weight with every spoonful. Do not press it down or shake the measure to settle it, because that packs it too. The spooned and levelled method is a technique, not a machine setting, so two people measuring the same ingredient can still differ by a few grams, which is why the figures on this page are approximate. When the recipe matters, weigh the tomato sauce on a kitchen scale instead: put the bowl on the scale, press tare, and add the tomato sauce until the scale reads the weight you need.
How to store Tomato Sauce
Refrigerate after opening; use within 1 week. That storage advice is worth following, because tomato sauce goes stale faster than most cooks expect, and stale tomato sauce will spoil a whole batch of baking. Keep it sealed, because air and moisture are what make it go stale, and keep it away from strong smells, because it absorbs odours from the cupboard. Check the ingredient before you use it: smell it, taste a little, and look at it. If it smells sharp, stale or off, or if it has changed colour or texture, replace it rather than risking a recipe on it. A small amount of fresh tomato sauce is always better than a large amount of stale tomato sauce, and the cost of replacing it is far less than the cost of a ruined bake.
What to use instead of Tomato Sauce
If you run out of tomato sauce, the closest swaps are Tomato Paste at 262 g per cup, Ketchup at 240 g per cup. Swap by weight, not by volume, because the cup weights differ, and a volume swap gives the wrong amount. Each substitute changes the flavour a little, so choose the one that suits the dish: a mild substitute for a delicate bake, and a stronger one where the flavour can carry it. Taste the finished dish before serving, because a substitute that works in a salad may not work in a cake, and the other way round.
Worked examples: Tomato Sauce in real recipes
1. A weeknight pasta with tomato sauce
A weeknight pasta for four uses 16 tablespoons of tomato sauce, about 245 g, warmed gently with garlic and olive oil and tossed through the pasta. The sauce should coat the pasta, not drown it, and the weight is what decides the balance: too much sauce and the dish turns soupy, too little and the pasta stays dry. Warm the sauce gently rather than boiling it, toss the pasta through the sauce in the pan, and save a little pasta water to loosen the sauce if it gets too thick.
2. A pizza with a thin layer of tomato sauce
A pizza for two uses 8 tablespoons of tomato sauce, about 122.5 g, spread thinly over the base, leaving a border for the crust. The sauce layer should be thin enough that the base stays crisp, and the weight is what decides that: too much sauce and the base goes soggy, too little and the pizza tastes dry. Spread the sauce with the back of a spoon, keep it away from the edge, and bake the pizza in a very hot oven so the base crisps before the sauce soaks in.
3. A braised chicken in tomato sauce
A braised chicken for four uses 12 tablespoons of tomato sauce, about 183.8 g, poured over browned chicken thighs with olives and herbs and simmered until the meat is tender. The sauce gives the dish its flavour and its moisture, and the weight matters because too much sauce makes the dish soupy, while too little leaves the chicken dry. Simmer the chicken gently with the lid on, so the sauce does not reduce too much, and taste it before serving, because the sauce concentrates as it cooks.
Why the weight of Tomato Sauce matters
Tomato sauce matters by weight because it is the base of so many dishes, and the amount decides the balance of the whole meal. In a pasta sauce, the sauce content decides whether the pasta is coated or drowned, and a 50 g error is enough to tip it: too much sauce and the dish turns soupy, too little and the pasta stays dry. In a pizza, the sauce layer decides whether the base stays crisp or goes soggy, and too much sauce is the most common reason a pizza base fails. The cup measure is unreliable because the sauce is thick and clings to the sides of the measure, so a scooped cup can be 15 g heavier than a spooned and levelled one. Weighing it keeps the ratio right, and it also matters because tomato sauce varies in thickness: a thin sauce weighs less per cup than a thick one, so the weight is a better guide than the volume.
The USDA figure, and how it was measured
The USDA figure for tomato sauce is not disputed: 245 g per cup, spooned and levelled, is the accepted value, and other sources agree within a few grams. Small differences between brands and batches are normal, because natural ingredients vary, but the variation is small enough that the figure on this page is a reliable guide for everyday cooking. The figure on this page, 245 g per cup, was measured spooned and levelled, which is the standard method for this kind of ingredient. If you measure it differently — scooping instead of spooning, packing instead of levelling, or measuring after chopping — the weight changes, and the recipe changes with it. The source matters too: USDA is the reference used throughout this site, because its figures are consistent and widely used in baking, and the USDA figures are used where King Arthur does not publish one. When two sources disagree, this site says so, and the figure given is the one judged most reliable for everyday cooking.
Common mistakes with Tomato Sauce
The most common mistake is using too much tomato sauce on a pizza, which makes the base soggy and prevents the crust crisping. Use a thin layer, and spread it evenly, leaving a border for the crust. The second mistake is using tomato sauce as a substitute for tomato paste without adjusting: sauce is much thinner, so you need about three times as much, and the flavour is less intense. The third mistake is storing opened tomato sauce in the cupboard, where it goes off quickly; refrigerate it and use it within a week. Finally, do not add tomato sauce to a dish and expect it to thicken on its own: it needs simmering to reduce, and a sauce that is not reduced stays thin and watery.
Frequently asked questions
How many grams is 1 cup of tomato sauce?
One cup of tomato sauce weighs about 245 g, spooned and levelled, using the USDA figure. That is for smooth, cooked tomato sauce as sold, and the weight varies slightly with thickness, because a thick sauce weighs more per cup than a thin one. The figure is approximate, so verify with a kitchen scale when the recipe matters.
How many tablespoons is 100 grams of tomato sauce?
100 grams of tomato sauce is about 6.5 tablespoons, spooned and levelled, because one tablespoon weighs about 15.3 g. Six level tablespoons is just under 100 g, so add a small spoonful more, or weigh the sauce on a scale, which is easier because it clings to the spoon.
What is the difference between tomato sauce and tomato paste?
Tomato sauce is a smooth, cooked sauce that is ready to use, while tomato paste is a concentrated paste that needs diluting. Sauce weighs 245 g per cup and paste weighs 262 g, but the real difference is concentration: paste is far more intense, so you need about three times as much sauce as paste to get the same flavour. Use sauce when the recipe wants a ready base, and paste when it wants depth.
Can I use ketchup instead of tomato sauce?
It is better not to. Ketchup is sweet and vinegary, while tomato sauce is savoury and lightly seasoned, so a pasta sauce made with ketchup tastes completely different. If you must swap, use less ketchup and add no extra sugar, but the result will still taste of ketchup, which suits a barbecue sauce better than a pasta sauce.
How should I store tomato sauce?
Refrigerate it after opening and use it within 1 week. Opened tomato sauce goes off quickly, even in the fridge, so use it promptly or freeze it in portions. Unopened jars keep in a cool cupboard for months, and frozen sauce keeps for up to three months.