Caster Sugar Cups to Ounces (Weight)
Snapshot
1 cup of caster sugar equals 6.7 ounces. Conversion Encyclopedia keeps one fixed ingredient basis on this page so the calculator, common values, and reverse page stay aligned.
- Reference basis: 190 g per 1 US cup.
- Example: 2 cups = 13.4 oz.
- Use the reverse page if you need the opposite direction with the same basis.
Use the interactive calculator below for custom values and the common-value table for quick checks.
Interactive conversion
Converter Calculator
6.7 Ounces
SwitchMachine access
Available to apps and AI agents
Caster Sugar Cups to Ounces (Weight) can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The caster-sugar identifier tells the conversion engine which ingredient record to use for the same calculation shown by the calculator.
Machine-readable identifiers
- Conversion family
cooking- Source unit
cup_us- Target unit
ounce_weight- Ingredient
caster-sugar
The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.
Example API request and response
POST /api/v1/convertRequest
{
"family": "cooking",
"value": 1,
"from": "cup_us",
"to": "ounce_weight",
"material": "caster-sugar"
}Essential response
{
"ok": true,
"conversion": {
"family": "cooking",
"value": 1,
"from": "cup_us",
"to": "ounce_weight",
"result": {
"raw": 6.7,
"display": "6.7"
},
"canonicalPath": "/cooking/cups-to-ounces-weight/caster-sugar/"
}
}Explanation
Convert 1 US cup of caster sugar to ounces by weight with an ingredient-specific cup reference.
The result is mass, not fluid ounces. That is especially useful for baking, syrups, and dessert prep where sweetness and structure depend on repeatable weight. The reverse conversion uses the same ounce-per-cup reference.
Common Conversion Values
| Cups | Ounces |
|---|---|
| 1/4 | 1.68 |
| 1/3 | 2.23 |
| 1/2 | 3.35 |
| 1 | 6.7 |
| 1 1/2 | 10.05 |
| 2 | 13.4 |
| 3 | 20.1 |
Methodology
Caster Sugar: cups to ounces by weight evidence
Direction calculation: Caster Sugar — 1 US cup equals 6.702058237 ounces by weight. Reference: 190 g/US cup. Source basis: King Arthur Ingredient Weight Chart (Baker's Special Sugar / castor sugar: 1 cup = 190g)
Among the 17 reviewed records labeled Sugars & Sweeteners, the nearest factor to Caster Sugar is Erythritol at 190 g/cup: a difference of 0 g/cup (0.0% relative to Caster Sugar). The observed range in this labeled group is Stevia at 96 g/cup to Honey at 340 g/cup.
Crystal size, packing, moisture, and syrup concentration can change how much mass occupies the same kitchen volume.
Questions & answers
Frequently Asked Questions
How many ounces are in 1 cup of Caster Sugar?
1 US cup of Caster Sugar is 6.7 ounces by weight based on the density reference for Caster Sugar.
Is this weight ounces or fluid ounces?
It is weight ounces. This page converts cup volume into ingredient mass, not fluid ounces.
Does crystal size or packing change the result for Caster Sugar?
Caster Sugar keeps one reference basis here, but crystal size, moisture, and caking can shift how much fits in a spoon or cup. That matters more with sugars and sweeteners than with a purely liquid measure.
How many ounces are in 2 cups of Caster Sugar?
2 cups of Caster Sugar are 13.4 oz (weight) using 6.7 oz per cup.
How do I convert Caster Sugar ounces back to cups?
Use the mirror Ounces To Cups page; divide ounces (weight) by 6.7 to return cups.