Ounces to Cups Converter
Convert fluid ounces to cups and dry (weight) ounces to cups. Fluid mode covers US, metric and imperial cups both ways; dry mode uses real ingredient densities for flour, sugar, butter, honey, oil, cocoa and water, plus a custom density.
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Ounces to cups calculator
All units, synced
Density values are typical averages (King Arthur Baking chart). Flour in particular varies with packing and humidity; for critical baking, weigh in grams.
Ounce to cup ladder
= 16 tbsp
= 48 tsp
= 236.5882365 mL
= 2 tbsp
= 6 tsp
= 29.5735295625 mL
then divide by
grams per cup
Quick reference: fluid ounces to US cups
| Fluid ounces | US cups | Metric cups | Imperial cups |
|---|---|---|---|
| 1 fl oz | 0.125 | 0.1183 | 0.1041 |
| 2 fl oz | 0.25 | 0.2366 | 0.2082 |
| 4 fl oz | 0.5 | 0.4732 | 0.4163 |
| 6 fl oz | 0.75 | 0.7098 | 0.6245 |
| 8 fl oz | 1 | 0.9464 | 0.8327 |
| 12 fl oz | 1.5 | 1.4195 | 1.249 |
| 16 fl oz | 2 | 1.8927 | 1.6653 |
| 24 fl oz | 3 | 2.8391 | 2.498 |
| 32 fl oz | 4 | 3.7854 | 3.3307 |
| 64 fl oz | 8 | 7.5708 | 6.6614 |
Quick reference: dry ounces to US cups
| Dry ounces | Flour (120 g/cup) | Sugar (198 g/cup) | Butter (227 g/cup) | Honey (336 g/cup) |
|---|---|---|---|---|
| 4 oz | 0.945 | 0.5727 | 0.4996 | 0.3375 |
| 8 oz | 1.89 | 1.1454 | 0.9991 | 0.675 |
| 16 oz | 3.7799 | 2.2909 | 1.9982 | 1.35 |
Formula: cups = dry oz x 28.349523125 / grams per cup. Example: 8 oz flour = 8 x 28.349523125 / 120 = 1.89 cups.
Worked examples
1. 8 fluid ounces to US cups
8 x 29.5735295625 / 236.5882365 = 1 US cup exactly. This is the famous rule, and it only holds for fluid ounces.
2. 16 fluid ounces to metric cups
16 x 29.5735295625 / 250 = 1.892706 metric cups. Two US cups are a little under two metric cups.
3. 1 fluid ounce to US cups
1 / 8 = 0.125 US cups. One fluid ounce is one eighth of a US cup, or 2 tablespoons.
4. 8 dry ounces of flour to US cups
8 x 28.349523125 / 120 = 1.89 US cups. Flour is light, so 8 weight-ounces fill almost two cups.
5. 16 dry ounces of sugar to US cups
16 x 28.349523125 / 198 = 2.2909 US cups. Sugar is denser than flour, so a pound of sugar is about 2.29 cups.
6. 4 dry ounces of butter to US cups
4 x 28.349523125 / 227 = 0.4996 US cups, about half a cup. One stick of butter is 4 oz, which is why sticks are marked as 1/2 cup.
Which nrtechstudio tool do you need?
ounces-to-cups (this tool, #980): start from ounces. Fluid ounces to cups both ways (US, metric, imperial), plus dry ounces to cups with ingredient densities. The only tool here that answers "is 8 oz always 1 cup" with both answers.
ml-to-cups (#961): start from milliliters. An 8-unit hub (mL, L, cups, fl oz, tbsp, tsp). It can compute fl oz to cups, but its headline intent is ml to cups.
cups-to-quarts-converter (#862): cups to quarts and back (US, imperial, US dry). No ounces on either side.
l-to-gal (#929): liters, milliliters, gallons, fluid ounces and quarts. It has fluid ounces but no cups at all.
fluid-ounces-to-pounds-conversion (#880): fluid ounces to pounds (weight). Cups appear there only as a secondary readout, not as the conversion target.
Frequently asked questions
How many cups is 8 ounces?
8 fluid ounces = 1 US cup exactly. But 8 dry ounces (weight) depends on the ingredient: 8 oz of flour = 1.89 cups, 8 oz of sugar = 1.1454 cups, 8 oz of butter = 0.9991 cups, 8 oz of honey = 0.675 cups.
Is 8 oz always equal to 1 cup?
No. Only 8 fluid ounces (a volume) equals 1 US cup. 8 dry ounces (a weight) is a different amount for every ingredient, because flour, sugar, butter and honey all have different densities. Use dry mode above with the right ingredient.
What is the difference between a fluid ounce and a dry ounce?
A fluid ounce measures volume: 1 US fl oz = 29.5735295625 mL exactly. A dry (avoirdupois) ounce measures weight: 1 oz = 28.349523125 g exactly. You cannot convert one to the other without knowing the ingredient's density.
How many ounces are in 1 cup?
1 US cup holds 8 US fluid ounces. In weight, 1 cup of flour is about 4.23 oz (120 g), 1 cup of sugar is about 6.98 oz (198 g), 1 cup of butter is about 8.01 oz (227 g), and 1 cup of honey is about 11.85 oz (336 g).
How many cups is 16 ounces?
16 fluid ounces = 2 US cups exactly. For dry ounces: 16 oz of flour = 3.7799 cups, 16 oz of sugar = 2.2909 cups, 16 oz of butter = 1.9982 cups.
How many cups is 4 ounces?
4 fluid ounces = 0.5 US cups. For dry ounces: 4 oz of flour = 0.945 cups, 4 oz of sugar = 0.5727 cups, 4 oz of butter = 0.4996 cups (about half a cup, one stick).
How do you convert dry ounces to cups?
Use the formula: cups = dry oz x 28.349523125 / grams per cup. First convert ounces to grams (multiply by 28.349523125), then divide by how many grams of that ingredient fill one cup. Example: 8 oz flour = 8 x 28.349523125 / 120 = 1.89 cups.
How many cups is 8 oz of all-purpose flour?
8 dry ounces of all-purpose flour = 1.89 US cups (8 x 28.349523125 / 120). Flour is light, so a half pound of flour fills almost two cups. Note that flour weight per cup varies with packing; 120 g per cup is the King Arthur standard.
How many cups is 8 oz of granulated sugar?
8 dry ounces of granulated sugar = 1.1454 US cups (8 x 28.349523125 / 198). Sugar is denser than flour, so the same weight fills fewer cups.
How many cups is 4 oz of butter?
4 dry ounces of butter = 0.4996 US cups, about half a cup. That is why one stick of butter (4 oz) is marked as 1/2 cup on the wrapper.
Do US, metric and imperial cups give different answers?
Yes. 16 fluid ounces = 2 US cups but only 1.8927 metric cups and 1.6653 imperial cups, because the cup sizes differ: US 236.5882365 mL, metric 250 mL, imperial 284.130625 mL. Always check which cup your recipe means.
How many fluid ounces are in a metric cup?
1 metric cup (250 mL) = 8.4535 US fluid ounces. And 1 imperial cup (284.130625 mL) = 9.6076 US fluid ounces.
What is the formula for ounces to cups?
For fluid ounces to US cups: cups = fl oz / 8. To go back: fl oz = cups x 8. For dry ounces: cups = oz x 28.349523125 / grams per cup of the ingredient. For metric or imperial cups, replace 8 with the right ratio: fl oz / 8.4535 for metric, fl oz / 9.6076 for imperial.
Can I convert cups back to ounces with this tool?
Yes. In fluid mode, press Swap or just set From to cups and To to fluid ounces: 1 US cup = 8 fl oz exactly. Dry mode is one-way because cups to dry ounces needs the same density; rearrange the formula: dry oz = cups x grams per cup / 28.349523125.
Which nrtechstudio tool should I use for other conversions?
Use ml-to-cups (#961) when you start from milliliters, cups-to-quarts-converter (#862) for cups to quarts, l-to-gal (#929) for liters and gallons (no cups), and fluid-ounces-to-pounds-conversion (#880) for fluid ounces to weight in pounds. This tool (#980) is the ounces to cups specialist.
How accurate is this converter?
Fluid conversions use exact definitions: 29.5735295625 mL per US fl oz, 236.5882365 mL per US cup, 250 mL per metric cup, 284.130625 mL per imperial cup, 28.349523125 g per dry ounce. Dry conversions use typical ingredient densities (King Arthur Baking chart); flour especially varies with packing, so treat dry results as good estimates and weigh in grams for critical baking.
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