Grams of tomato sauce to cups runs on one number, 0.0040816327 cups per gram. It is a measured property of this ingredient rather than a defined conversion, which is why a generic volume-to-weight tool cannot give you it.
The density behind that figure is 1.0356 g per mL, against 1.00 for water. A cup of water weighs 236.6 g and a cup of tomato sauce weighs 245 g, so this ingredient is 103.6% as heavy as the same volume of water — the single fact the whole page rests on.
A cup of tomato sauce is 245 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 243.8 g and 247.4 g covers the range from lightly spooned to firmly packed. That 1% spread is larger than most of the adjustments recipes fuss over, and it disappears entirely the moment the ingredient is weighed instead.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.408% of a cup of tomato sauce, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 2.041 cups, and a 1 kg pack 4.082.
The condition this weight assumes: Plain passata or smooth sauce, not paste. Concentrated tomato paste is considerably heavier per cup because most of the water has been driven off, so the two are not interchangeable by volume.
The formula
grams- The amount of tomato sauce you are converting, in grams
0.00408163265306- Cups per gram for tomato sauce, from its density of 1.0356 g/mL
cups- The equivalent quantity in cups
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 0.00408163265306, the cups-per-gram figure for tomato sauce.
- The result appears in cups, with a second reading in tbsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
50 g of tomato sauce in cups
50 g of tomato sauce weighs out at 0.204082 cups. Divide 0.204082 by 0.0040816327 and you get back to 50 g, which is the quickest check that the factor is the right way up.
150 g of tomato sauce in cups
150 g of tomato sauce weighs out at 0.612245 cups. Divide 0.612245 by 0.0040816327 and you get back to 150 g, which is the quickest check that the factor is the right way up.
500 g of tomato sauce in cups
A recipe calling for 500 g of tomato sauce needs 2.04082 cups on the scale. The arithmetic is 500 × 0.0040816327 = 2.0408163, and halving the recipe halves the weight to 1.02041 cups.
How to read your score
Frequently asked questions
How many cups are in 1 g of tomato sauce?
One gram of tomato sauce is 0.0040816327 cups. Half that quantity is 0.00204082 cups and double it is 0.00816327 cups, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of tomato sauce not 236 g like water?
Because weight per cup depends on what is in the cup. Tomato sauce has a density of 1.0356 g per mL where water has 1.00, so a cup of it weighs 245 g rather than 236.6 g. That is a difference of 8.4 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Barely. Tomato sauce does not compress, so a cup of it is 245 g however it is poured — within about 1%, which is inside the accuracy of a domestic scale. This is the group where measuring by volume is defensible.
Is a fluid ounce of tomato sauce the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of tomato sauce weighs 1.08 oz, so the two readings differ by 8.03%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of tomato sauce would weigh 258.89 g instead of 245 g — 13.9 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
A scale, if the result matters. Volume measuring carries a spread of about 1% for tomato sauce — roughly 2.45 g on a 245 g cup — while a domestic scale is accurate to a gram or two. For anything where the ratio of ingredients drives the outcome, bread and pastry above all, weigh it.
How much does 2 cup of tomato sauce weigh?
2 cup of tomato sauce comes to 490 g, or 490 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the cups-to-grams page does it in the direction the question is usually asked.
Tomato sauce in grams and cups
| Grams | Cups | Unrounded |
|---|---|---|
| 5 g | 0.0204082 cup | 0.02040816327 |
| 10 g | 0.0408163 cup | 0.04081632653 |
| 25 g | 0.102041 cup | 0.1020408163 |
| 50 g | 0.204082 cup | 0.2040816327 |
| 100 g | 0.408163 cup | 0.4081632653 |
| 125 g | 0.510204 cup | 0.5102040816 |
| 150 g | 0.612245 cup | 0.612244898 |
| 200 g | 0.816327 cup | 0.8163265306 |
| 250 g | 1.02041 cup | 1.020408163 |
| 300 g | 1.22449 cup | 1.224489796 |
| 500 g | 2.04082 cup | 2.040816327 |
| 1000 g | 4.08163 cup | 4.081632653 |
Based on 245 g per cup of tomato sauce. One gram of tomato sauce is 0.0040816327 cups.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 245 g | 8.64 oz | 236.6 mL |
| 3/4 cup | 183.8 g | 6.48 oz | 177.4 mL |
| 2/3 cup | 163.3 g | 5.76 oz | 157.7 mL |
| 1/2 cup | 122.5 g | 4.32 oz | 118.3 mL |
| 1/3 cup | 81.67 g | 2.88 oz | 78.86 mL |
| 1/4 cup | 61.25 g | 2.16 oz | 59.15 mL |
| 1 tbsp | 15.31 g | 0.54 oz | 14.79 mL |
| 1 tsp | 5.104 g | 0.18 oz | 4.929 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Skim milk | 245 g | 8.642 oz | 1.036 |
| Buttermilk | 245 g | 8.642 oz | 1.036 |
| Plain yogurt | 245 g | 8.642 oz | 1.036 |
| Tomato sauce (this page) | 245 g | 8.642 oz | 1.036 |
| Orange juice | 248 g | 8.748 oz | 1.048 |
| Evaporated milk | 252 g | 8.889 oz | 1.065 |
| Peanut butter | 258 g | 9.101 oz | 1.091 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.