| US fluid ounce | 1 US fl oz | 2 US fl oz | 3 US fl oz | 4 US fl oz | 5 US fl oz | 6 US fl oz | 7 US fl oz | 8 US fl oz | 9 US fl oz | 10 US fl oz | 11 US fl oz | 12 US fl oz | 13 US fl oz | 14 US fl oz | 15 US fl oz | 16 US fl oz | 17 US fl oz | 18 US fl oz | 19 US fl oz | 20 US fl oz | 21 US fl oz | 22 US fl oz | 23 US fl oz | 24 US fl oz | 25 US fl oz | 26 US fl oz | 27 US fl oz | 28 US fl oz | 29 US fl oz | 30 US fl oz | 31 US fl oz | 32 US fl oz | 33 US fl oz | 34 US fl oz | 35 US fl oz | 36 US fl oz | 37 US fl oz | 38 US fl oz | 39 US fl oz | 40 US fl oz | 41 US fl oz | 42 US fl oz | 43 US fl oz | 44 US fl oz | 45 US fl oz | 46 US fl oz | 47 US fl oz | 48 US fl oz | 49 US fl oz | 50 US fl oz | 51 US fl oz | 52 US fl oz | 53 US fl oz | 54 US fl oz | 55 US fl oz | 56 US fl oz | 57 US fl oz | 58 US fl oz | 59 US fl oz | 60 US fl oz | 61 US fl oz | 62 US fl oz | 63 US fl oz | 64 US fl oz | 65 US fl oz | 66 US fl oz | 67 US fl oz | 68 US fl oz | 69 US fl oz | 70 US fl oz | 71 US fl oz | 72 US fl oz | 73 US fl oz | 74 US fl oz | 75 US fl oz | 76 US fl oz | 77 US fl oz | 78 US fl oz | 79 US fl oz | 80 US fl oz | 81 US fl oz | 82 US fl oz | 83 US fl oz | 84 US fl oz | 85 US fl oz | 86 US fl oz | 87 US fl oz | 88 US fl oz | 89 US fl oz | 90 US fl oz | 91 US fl oz | 92 US fl oz | 93 US fl oz | 94 US fl oz | 95 US fl oz | 96 US fl oz | 97 US fl oz | 98 US fl oz | 99 US fl oz | 100 US fl oz |
| US legal cup | 0.1232230 c (US Legal) | 0.2464461 c (US Legal) | 0.3696691 c (US Legal) | 0.4928922 c (US Legal) | 0.6161152 c (US Legal) | 0.7393382 c (US Legal) | 0.8625613 c (US Legal) | 0.9857843 c (US Legal) | 1.1090074 c (US Legal) | 1.2322304 c (US Legal) | 1.3554534 c (US Legal) | 1.4786765 c (US Legal) | 1.6018995 c (US Legal) | 1.7251226 c (US Legal) | 1.8483456 c (US Legal) | 1.9715686 c (US Legal) | 2.0947917 c (US Legal) | 2.2180147 c (US Legal) | 2.3412378 c (US Legal) | 2.4644608 c (US Legal) | 2.5876838 c (US Legal) | 2.7109069 c (US Legal) | 2.8341299 c (US Legal) | 2.9573530 c (US Legal) | 3.0805760 c (US Legal) | 3.2037990 c (US Legal) | 3.3270221 c (US Legal) | 3.4502451 c (US Legal) | 3.5734682 c (US Legal) | 3.6966912 c (US Legal) | 3.8199142 c (US Legal) | 3.9431373 c (US Legal) | 4.0663603 c (US Legal) | 4.1895834 c (US Legal) | 4.3128064 c (US Legal) | 4.4360294 c (US Legal) | 4.5592525 c (US Legal) | 4.6824755 c (US Legal) | 4.8056986 c (US Legal) | 4.9289216 c (US Legal) | 5.0521446 c (US Legal) | 5.1753677 c (US Legal) | 5.2985907 c (US Legal) | 5.4218138 c (US Legal) | 5.5450368 c (US Legal) | 5.6682598 c (US Legal) | 5.7914829 c (US Legal) | 5.9147059 c (US Legal) | 6.0379290 c (US Legal) | 6.1611520 c (US Legal) | 6.2843750 c (US Legal) | 6.4075981 c (US Legal) | 6.5308211 c (US Legal) | 6.6540442 c (US Legal) | 6.7772672 c (US Legal) | 6.9004902 c (US Legal) | 7.0237133 c (US Legal) | 7.1469363 c (US Legal) | 7.2701594 c (US Legal) | 7.3933824 c (US Legal) | 7.5166054 c (US Legal) | 7.6398285 c (US Legal) | 7.7630515 c (US Legal) | 7.8862746 c (US Legal) | 8.0094976 c (US Legal) | 8.1327206 c (US Legal) | 8.2559437 c (US Legal) | 8.3791667 c (US Legal) | 8.5023897 c (US Legal) | 8.6256128 c (US Legal) | 8.7488358 c (US Legal) | 8.8720589 c (US Legal) | 8.9952819 c (US Legal) | 9.1185049 c (US Legal) | 9.2417280 c (US Legal) | 9.3649510 c (US Legal) | 9.4881741 c (US Legal) | 9.6113971 c (US Legal) | 9.7346201 c (US Legal) | 9.8578432 c (US Legal) | 9.9810662 c (US Legal) | 10.1042893 c (US Legal) | 10.2275123 c (US Legal) | 10.3507353 c (US Legal) | 10.4739584 c (US Legal) | 10.5971814 c (US Legal) | 10.7204045 c (US Legal) | 10.8436275 c (US Legal) | 10.9668505 c (US Legal) | 11.0900736 c (US Legal) | 11.2132966 c (US Legal) | 11.3365197 c (US Legal) | 11.4597427 c (US Legal) | 11.5829657 c (US Legal) | 11.7061888 c (US Legal) | 11.8294118 c (US Legal) | 11.9526349 c (US Legal) | 12.0758579 c (US Legal) | 12.1990809 c (US Legal) | 12.3223040 c (US Legal) |
A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl., old forms ℥, fl ℥, f℥, ƒ ℥) is a unit of volume (also called capacity) typically used for measuring liquids. Various definitions have been used throughout history, but only two are still in common use: the British Imperial and the United States customary fluid ounce. An imperial fluid ounce is 1⁄20 of an imperial pint, 1⁄160 of an imperial gallon or approximately 28.4 ml. A US fluid ounce is 1⁄16 of a US fluid pint and 1⁄128 of a US liquid gallon or approximately 29.57 ml, making it about 4% larger than the imperial fluid ounce.
US customary fluid ounce
| 1 US fluid ounce | = | 1⁄128 | US gallon |
| = | 1⁄32 | US quart | |
| = | 1⁄16 | US pint | |
| = | 1⁄8 | US cup | |
| = | 1⁄4 | US gill | |
| = | 2 | US tablespoons | |
| = | 6 | US teaspoons | |
| = | 8 | US fluid drams | |
| = | 1.8046875 | cubic inches | |
| = | 29.5735295625 | millilitres | |
| ≈ | 1.040842731 | imperial fluid ounces |
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| US fluid ounce | US fl oz | ≡ 1⁄128 gal (US) | ≡ 29.5735295625×10−6 m3 | Imperial/US |
| US fluid ounces | US legal cups | US fluid ounces | US legal cups |
|---|---|---|---|
| 1 | = 0.12322303984375 | 6 | = 0.7393382390625 |
| 2 | = 0.2464460796875 | 7 | = 0.86256127890625 |
| 3 | = 0.36966911953125 | 8 | = 0.98578431875 |
| 4 | = 0.492892159375 | 9 | = 1.1090073585937 |
| 5 | = 0.61611519921875 | 10 | = 1.2322303984375 |
The cup currently used in the United States for nutrition labelling is defined in United States law as 240 ml.
| 1 U.S. "legal" cup | = | 240 | millilitres |
| = | 16 | international tablespoons | |
| = | 12 | Australian tablespoons | |
| ≈ | 8.12 | U.S. customary fluid ounces | |
| ≈ | 8.45 | imperial fluid ounces |
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| US legal cup | c (US Legal) | ≡ 240 mL | = 2.4×10−4 m3 | Imperial/US |
| US legal cups | US fluid ounces | US legal cups | US fluid ounces |
|---|---|---|---|
| 1 | = 8.1153654484423 | 6 | = 48.692192690654 |
| 2 | = 16.230730896885 | 7 | = 56.807558139096 |
| 3 | = 24.346096345327 | 8 | = 64.922923587539 |
| 4 | = 32.461461793769 | 9 | = 73.038289035981 |
| 5 | = 40.576827242212 | 10 | = 81.153654484423 |
| US fluid ounces | US legal cups |
|---|---|
| 1 | = 0.1232230 |
| 8.1153654 | = 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |