To convert ounces of tomato sauce into cups, multiply by 0.11571234: one ounce comes to 0.11571234 cups. Every ingredient has its own figure here, because the units are measuring different things and only the density links them.
Put next to water — 1 g per mL exactly — tomato sauce measures 1.0356 g per mL. That ratio, 103.6%, is what separates this page from every other ingredient in the same units, and it is measured rather than defined.
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.
One cup of tomato sauce is 8.642 oz. US kitchen scales usually step in eighths of an ounce, which is 3.54 g — around 1.45% of a cup of this ingredient, so the scale is precise enough for a full cup and coarse for a spoonful. That is why recipes mix the two systems: ounces for the bulk, spoons for the small amounts.
How the figure is arrived at: 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
ounces- The amount of tomato sauce you are converting, in ounces
0.115712339286- Cups per ounce 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 ounces.
- It is multiplied by 0.115712339286, the cups-per-ounce 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
2 oz of tomato sauce in cups
2 oz of tomato sauce weighs out at 0.231425 cups. Divide 0.231425 by 0.11571234 and you get back to 2 oz, which is the quickest check that the factor is the right way up.
4 oz of tomato sauce in cups
A recipe calling for 4 oz of tomato sauce needs 0.462849 cups on the scale. The arithmetic is 4 × 0.11571234 = 0.46284936, and halving the recipe halves the weight to 0.231425 cups.
12 oz of tomato sauce in cups
12 oz of tomato sauce weighs out at 1.38855 cups. Divide 1.38855 by 0.11571234 and you get back to 12 oz, which is the quickest check that the factor is the right way up.
How to read your score
Frequently asked questions
How many cups are in 1 oz of tomato sauce?
One ounce of tomato sauce is 0.11571234 cups. Half that quantity is 0.0578562 cups and double it is 0.231425 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 17.284 ounces. This page runs that calculation in reverse — enter a weight and it returns the volume — and the cups-to-ounces page does it in the direction the question is usually asked.
Tomato sauce in ounces and cups
| Ounces | Cups | Unrounded |
|---|---|---|
| 1/2 oz | 0.0578562 cup | 0.05785616964 |
| 1 oz | 0.115712 cup | 0.1157123393 |
| 2 oz | 0.231425 cup | 0.2314246786 |
| 3 oz | 0.347137 cup | 0.3471370179 |
| 4 oz | 0.462849 cup | 0.4628493571 |
| 6 oz | 0.694274 cup | 0.6942740357 |
| 8 oz | 0.925699 cup | 0.9256987143 |
| 12 oz | 1.38855 cup | 1.388548071 |
| 16 oz | 1.8514 cup | 1.851397429 |
Based on 245 g per cup of tomato sauce. One ounce of tomato sauce is 0.11571234 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.