Convert fluid ounces to cups (8 US fl oz = 1 cup) or back, switch to UK ounces or a metric cup, or convert ounces by weight of flour, sugar, cheese and more to cups.
cups = US fl oz ÷ 8 · fl oz = cups × 8
US fluid ounces and US cups. 8 fl oz = 1 cup exactly, so divide by 8.
| Fluid ounces | Cups | Measuring cups | mL |
|---|---|---|---|
| 1 fl oz | 0.125 | 2 tbsp | 30 |
| 2 fl oz | 0.25 | ¼ cup | 59 |
| 3 fl oz | 0.375 | ¼ cup + 2 tbsp | 89 |
| 4 fl oz | 0.5 | ½ cup | 118 |
| 5 fl oz | 0.625 | ½ cup + 2 tbsp | 148 |
| 6 fl oz | 0.75 | ¾ cup | 177 |
| 8 fl oz | 1 | 1 cup | 237 |
| 10 fl oz | 1.25 | 1¼ cups | 296 |
| 12 fl oz | 1.5 | 1½ cups | 355 |
| 16 fl oz | 2 | 2 cups | 473 |
| 20 fl oz | 2.5 | 2½ cups | 591 |
| 24 fl oz | 3 | 3 cups | 710 |
| 32 fl oz | 4 | 4 cups | 946 |
| 48 fl oz | 6 | 6 cups | 1,420 |
| 64 fl oz | 8 | 8 cups | 1,893 |
"Oz" on a package is usually weight: a 12 oz bag of chocolate chips or an 8 oz block of cheese. "Fl oz" is volume. The two only line up for water and similar liquids, where 8 oz by weight takes up almost exactly 8 fl oz. For anything lighter or heavier than water, 8 oz by weight is more or less than a cup:
| 8 oz (227 g) of | Cups | Measuring cups |
|---|---|---|
| Water | 0.96 | ¾ cup + 3 tbsp |
| Milk (whole) | 0.93 | ¾ cup + 3 tbsp |
| Honey | 0.67 | ½ cup + 3 tbsp |
| Butter | 1 | 1 cup |
| All-purpose flour | 1.81 | 1¾ cups + 1 tbsp |
| Granulated sugar | 1.13 | 1 cup + 2 tbsp |
| Brown sugar (packed) | 1.03 | 1 cup |
| Powdered sugar | 1.89 | 1¾ cups + 2 tbsp |
| Cocoa powder | 2.64 | 2½ cups + 2 tbsp |
| Long-grain rice (dry) | 1.23 | 1¼ cups |
| Rolled oats | 2.8 | 2¾ cups + 1 tbsp |
| Cheddar, shredded | 2.01 | 2 cups |
| Chocolate chips | 1.35 | 1¼ cups + 2 tbsp |
| Blueberries | 1.53 | 1½ cups + 1 tbsp |
| Walnuts, chopped | 1.94 | 1¾ cups + 3 tbsp |
If a US recipe lists liquids in plain "oz", it almost always means fluid ounces. For dry ingredients listed in ounces, it means weight, and a kitchen scale is the reliable way to measure them.
You're aiming for 64 fl oz of water a day, the "eight 8-ounce glasses" habit, and you drink from 500 mL bottles labelled 16.9 fl oz. (This is the Load Example.)
Step 1: One bottle in cups
Step 2: The goal in cups
Step 3: Bottles needed
Four bottles covers it with a little to spare. Food and other drinks also count towards your water intake; the 64 oz figure is a habit rather than a medical target.
| Drink | fl oz | Cups |
|---|---|---|
| Espresso shot (double) | 2 | 0.25 |
| Coffee-maker “cup” | 5 | 0.63 |
| Soda can | 12 | 1.5 |
| Water bottle, 500 mL | 16.9 | 2.11 |
| Soda bottle | 20 | 2.5 |
| Sports bottle, 32 oz | 32 | 4 |
| “Eight glasses a day” | 64 | 8 |
The "cups" on a coffee maker's carafe are usually 5 or 6 fl oz, not 8. A 12-cup machine with 5 oz cups brews 60 fl oz, or 7½ measuring cups. Check your manual.
A UK (imperial) fluid ounce is 28.41 mL, about 4% smaller than the US 29.57 mL. Oddly, the UK pint is bigger, because it holds 20 fl oz against the US pint's 16. For a few ounces the difference doesn't matter in cooking; over a pint it adds up to a 20% gap.
US nutrition labels add one more variation: they round a cup to 240 mL and a fluid ounce to 30 mL. That's why an 8 fl oz serving is printed as "1 cup (240 mL)" though it's really 236.6 mL. Australian, New Zealand and Canadian recipes use a 250 mL metric cup. Pick the matching cup in the tool when you follow those recipes.
| Measure | US | UK |
|---|---|---|
| 1 fluid ounce | 29.57 mL | 28.41 mL |
| Fl oz in a pint | 16 | 20 |
| Fl oz in 1 US cup (236.6 mL) | 8 | 8.33 |
| Fl oz in a metric cup (250 mL) | 8.45 | 8.80 |
No jug with ounce marks? Spoons work for small amounts: 1 US fl oz is exactly 2 tablespoons. For larger amounts, use a clear liquid measuring cup on the counter and read it at eye level at the bottom of the curved surface. Dry measuring cups, filled to the brim, tend to spill and come out short.
| Amount | Tablespoons | Teaspoons | mL |
|---|---|---|---|
| 1 fl oz | 2 tbsp | 6 tsp | 29.6 mL |
| ½ fl oz | 1 tbsp | 3 tsp | 14.8 mL |
| 1.5 fl oz (a jigger) | 3 tbsp | 9 tsp | 44.4 mL |
| 2 fl oz (¼ cup) | 4 tbsp | 12 tsp | 59.1 mL |
| 4 fl oz (½ cup) | 8 tbsp | 24 tsp | 118.3 mL |
Baby bottles are marked in both ounces and millilitres; 4 fl oz is 118 mL, often rounded to 120 on the bottle. For other kitchen units, try the volume converter.
Only for fluid ounces: 8 US fl oz is exactly 1 US cup. 8 oz by weight is 1 cup only for water-like liquids; 8 oz of flour is about 1.8 cups.
1½ cups (12 US fl oz), the size of a soda can.
6 US fluid ounces (177 mL), which is also 12 tablespoons.
About 1 cup. Chocolate chips weigh about 168 g per cup and 6 oz is 170 g.
Related Tools
Convert between hundreds of cubic feet and gallons.
Estimate material weight from volume and density.
Estimate weight in pounds using ingredient density.
Estimate liquid volume from a drop count.
Convert gallons to other volume units.
Convert liquid volume to weight using density.