Leaveners, Salt & Spices
Convert ounces of baking powder to cups
One ounce of baking powder weighs about 0.148 cup, and half a ounce comes to roughly 0.074 cup. Enter any amount below to convert it, or use the chart further down as a quick reference while you cook.
1 oz of baking powder =
0.148 cup
About 1/8 cup in recipe notation
- ml
- 34.9
- tbsp
- 2.36
Baking Powder: 192 g per US cup · NIST Handbook 133. 1 teaspoon = 4 g. Leavening errors are unforgiving, so measure with level spoons or a 0.1 g scale.
Full baking powder chart →Baking Powder at a glance
Every number on this page comes from a single figure: 192 grams per US cup (NIST Handbook 133).
- 1 cup
- 192 g
- 1 tablespoon
- 12 g
- 1 teaspoon
- 4 g
- 1 cup in ounces
- 6.77 oz
- 100 g in cups
- 0.521 cups
- Density
- 0.81 g/ml
ounces to cups chart for baking powder
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 | 0.074 cup | 1.18 tbsp | 17.5 ml |
| 1 oz | 0.148 cup | 2.36 tbsp | 34.9 ml |
| 2 oz | 0.295 cup | 4.72 tbsp | 69.9 ml |
| 3 oz | 0.443 cup | 7.09 tbsp | 105 ml |
| 4 oz | 0.591 cup | 9.45 tbsp | 140 ml |
| 5 oz | 0.738 cup | 11.8 tbsp | 175 ml |
| 6 oz | 0.886 cup | 14.2 tbsp | 210 ml |
| 8 oz | 1.18 cup | 18.9 tbsp | 279 ml |
| 12 oz | 1.77 cup | 28.3 tbsp | 419 ml |
| 16 oz | 2.36 cup | 37.8 tbsp | 559 ml |
How this conversion is calculated
Volume-to-weight conversions are only as good as the density behind them. We treat baking powder as 192 g per US customary cup, which works out to 0.812 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 1/2 cups.
Measuring baking powder accurately
1 teaspoon = 4 g. Leavening errors are unforgiving, so measure with level spoons or a 0.1 g scale.
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 baking powder?
1 ounce of baking powder is 0.148 cup. This is based on a density of 192 g per US cup.
How many cups are in 2 ounces of baking powder?
2 ounces of baking powder is 0.295 cup, and 0.074 cup for half a ounce.
How much is 100 g of baking powder in cups?
100 g of baking powder is about 1/2 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 baking powder?
1 teaspoon = 4 g. Leavening errors are unforgiving, so measure with level spoons or a 0.1 g scale.
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.