Pantry & Condiments
Convert ounces of ketchup to cups
One ounce of ketchup weighs about 0.104 cup, and half a ounce comes to roughly 0.052 cup. Enter any amount below to convert it, or use the chart further down as a quick reference while you cook.
1 oz of ketchup =
0.104 cup
About 1/8 cup in recipe notation
- ml
- 24.6
- tbsp
- 1.66
Ketchup: 273 g per US cup · USDA FoodData Central. Sugar and tomato solids make ketchup noticeably denser than water.
Full ketchup chart →Ketchup at a glance
Every number on this page comes from a single figure: 273 grams per US cup (USDA FoodData Central).
- 1 cup
- 273 g
- 1 tablespoon
- 17.1 g
- 1 teaspoon
- 5.69 g
- 1 cup in ounces
- 9.63 oz
- 100 g in cups
- 0.366 cups
- Density
- 1.15 g/ml
ounces to cups chart for ketchup
Print it, screenshot it, or bookmark this page — these are the amounts recipes ask for most often.
| Ounces (weight) | Cups (US) | Tablespoons (US) | Millilitres |
|---|---|---|---|
| 0.5 oz | 0.052 cup | 0.831 tbsp | 12.3 ml |
| 1 oz | 0.104 cup | 1.66 tbsp | 24.6 ml |
| 2 oz | 0.208 cup | 3.32 tbsp | 49.1 ml |
| 3 oz | 0.312 cup | 4.98 tbsp | 73.7 ml |
| 4 oz | 0.415 cup | 6.65 tbsp | 98.3 ml |
| 5 oz | 0.519 cup | 8.31 tbsp | 123 ml |
| 6 oz | 0.623 cup | 9.97 tbsp | 147 ml |
| 8 oz | 0.831 cup | 13.3 tbsp | 197 ml |
| 12 oz | 1.25 cup | 19.9 tbsp | 295 ml |
| 16 oz | 1.66 cup | 26.6 tbsp | 393 ml |
How this conversion is calculated
Volume-to-weight conversions are only as good as the density behind them. We treat ketchup as 273 g per US customary cup, which works out to 1.154 g/ml. From there:
- Your ounces figure is converted into millilitres or grams using standard unit sizes (oz = 28.3 g).
- The density above bridges volume and weight in whichever direction you need.
- The result is rounded the way a cook would round it — to the nearest gram, or to a usable fraction such as 3/8 cups.
Measuring ketchup accurately
Sugar and tomato solids make ketchup noticeably denser than water.
If a recipe matters to you — bread, macarons, anything with a tight hydration or ratio — weigh it. A £10 digital scale removes the single largest source of variation in home baking, and it is faster than washing three measuring cups.
When cups are fine
- Liquids measured in a proper jug, where volume is the honest unit anyway.
- Forgiving savoury cooking: soups, stews, stir-fries, marinades.
- Small amounts of leaveners and spices, as long as you use level spoons.
Frequently asked questions
How many cups are in 1 ounce of ketchup?
1 ounce of ketchup is 0.104 cup. This is based on a density of 273 g per US cup.
How many cups are in 2 ounces of ketchup?
2 ounces of ketchup is 0.208 cup, and 0.052 cup for half a ounce.
How much is 100 g of ketchup in cups?
100 g of ketchup is about 3/8 cups. Weight is always the more reliable measurement, so use a scale when the recipe gives grams.
Why do other sites give a different number for ketchup?
Sugar and tomato solids make ketchup noticeably denser than water.
Do UK and Australian cups give the same result?
No. A US customary cup is 236.6 ml, a metric cup used in Australia and New Zealand is 250 ml, and an old UK imperial cup is 284 ml. Our default is the US cup, but you can pick metric cups in the converter.