| US legal cup | 1 c (US Legal) | 2 c (US Legal) | 3 c (US Legal) | 4 c (US Legal) | 5 c (US Legal) | 6 c (US Legal) | 7 c (US Legal) | 8 c (US Legal) | 9 c (US Legal) | 10 c (US Legal) | 11 c (US Legal) | 12 c (US Legal) | 13 c (US Legal) | 14 c (US Legal) | 15 c (US Legal) | 16 c (US Legal) | 17 c (US Legal) | 18 c (US Legal) | 19 c (US Legal) | 20 c (US Legal) | 21 c (US Legal) | 22 c (US Legal) | 23 c (US Legal) | 24 c (US Legal) | 25 c (US Legal) | 26 c (US Legal) | 27 c (US Legal) | 28 c (US Legal) | 29 c (US Legal) | 30 c (US Legal) | 31 c (US Legal) | 32 c (US Legal) | 33 c (US Legal) | 34 c (US Legal) | 35 c (US Legal) | 36 c (US Legal) | 37 c (US Legal) | 38 c (US Legal) | 39 c (US Legal) | 40 c (US Legal) | 41 c (US Legal) | 42 c (US Legal) | 43 c (US Legal) | 44 c (US Legal) | 45 c (US Legal) | 46 c (US Legal) | 47 c (US Legal) | 48 c (US Legal) | 49 c (US Legal) | 50 c (US Legal) | 51 c (US Legal) | 52 c (US Legal) | 53 c (US Legal) | 54 c (US Legal) | 55 c (US Legal) | 56 c (US Legal) | 57 c (US Legal) | 58 c (US Legal) | 59 c (US Legal) | 60 c (US Legal) | 61 c (US Legal) | 62 c (US Legal) | 63 c (US Legal) | 64 c (US Legal) | 65 c (US Legal) | 66 c (US Legal) | 67 c (US Legal) | 68 c (US Legal) | 69 c (US Legal) | 70 c (US Legal) | 71 c (US Legal) | 72 c (US Legal) | 73 c (US Legal) | 74 c (US Legal) | 75 c (US Legal) | 76 c (US Legal) | 77 c (US Legal) | 78 c (US Legal) | 79 c (US Legal) | 80 c (US Legal) | 81 c (US Legal) | 82 c (US Legal) | 83 c (US Legal) | 84 c (US Legal) | 85 c (US Legal) | 86 c (US Legal) | 87 c (US Legal) | 88 c (US Legal) | 89 c (US Legal) | 90 c (US Legal) | 91 c (US Legal) | 92 c (US Legal) | 93 c (US Legal) | 94 c (US Legal) | 95 c (US Legal) | 96 c (US Legal) | 97 c (US Legal) | 98 c (US Legal) | 99 c (US Legal) | 100 c (US Legal) |
| firkin | 0.0058658 firkin | 0.0117317 firkin | 0.0175975 firkin | 0.0234634 firkin | 0.0293292 firkin | 0.0351951 firkin | 0.0410609 firkin | 0.0469268 firkin | 0.0527926 firkin | 0.0586585 firkin | 0.0645243 firkin | 0.0703902 firkin | 0.0762560 firkin | 0.0821219 firkin | 0.0879877 firkin | 0.0938535 firkin | 0.0997194 firkin | 0.1055852 firkin | 0.1114511 firkin | 0.1173169 firkin | 0.1231828 firkin | 0.1290486 firkin | 0.1349145 firkin | 0.1407803 firkin | 0.1466462 firkin | 0.1525120 firkin | 0.1583779 firkin | 0.1642437 firkin | 0.1701096 firkin | 0.1759754 firkin | 0.1818412 firkin | 0.1877071 firkin | 0.1935729 firkin | 0.1994388 firkin | 0.2053046 firkin | 0.2111705 firkin | 0.2170363 firkin | 0.2229022 firkin | 0.2287680 firkin | 0.2346339 firkin | 0.2404997 firkin | 0.2463656 firkin | 0.2522314 firkin | 0.2580973 firkin | 0.2639631 firkin | 0.2698289 firkin | 0.2756948 firkin | 0.2815606 firkin | 0.2874265 firkin | 0.2932923 firkin | 0.2991582 firkin | 0.3050240 firkin | 0.3108899 firkin | 0.3167557 firkin | 0.3226216 firkin | 0.3284874 firkin | 0.3343533 firkin | 0.3402191 firkin | 0.3460850 firkin | 0.3519508 firkin | 0.3578166 firkin | 0.3636825 firkin | 0.3695483 firkin | 0.3754142 firkin | 0.3812800 firkin | 0.3871459 firkin | 0.3930117 firkin | 0.3988776 firkin | 0.4047434 firkin | 0.4106093 firkin | 0.4164751 firkin | 0.4223410 firkin | 0.4282068 firkin | 0.4340726 firkin | 0.4399385 firkin | 0.4458043 firkin | 0.4516702 firkin | 0.4575360 firkin | 0.4634019 firkin | 0.4692677 firkin | 0.4751336 firkin | 0.4809994 firkin | 0.4868653 firkin | 0.4927311 firkin | 0.4985970 firkin | 0.5044628 firkin | 0.5103287 firkin | 0.5161945 firkin | 0.5220603 firkin | 0.5279262 firkin | 0.5337920 firkin | 0.5396579 firkin | 0.5455237 firkin | 0.5513896 firkin | 0.5572554 firkin | 0.5631213 firkin | 0.5689871 firkin | 0.5748530 firkin | 0.5807188 firkin | 0.5865847 firkin |
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 | firkins | US legal cups | firkins |
|---|---|---|---|
| 1 | = 0.005865846621309 | 6 | = 0.035195079727854 |
| 2 | = 0.011731693242618 | 7 | = 0.041060926349163 |
| 3 | = 0.017597539863927 | 8 | = 0.046926772970472 |
| 4 | = 0.023463386485236 | 9 | = 0.052792619591781 |
| 5 | = 0.029329233106545 | 10 | = 0.05865846621309 |
The ale or beer firkin (from Middle Dutch vierdekijn meaning "fourth") is a quarter of an ale or beer barrel or half a kilderkin. This unit is much smaller than the wine firkin. Casks in this size (themselves called firkins) are the most common container for cask ale.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| firkin | ≡ 9 gal (imp) | = 0.04091481 m3 | Imperial/US |
| firkins | US legal cups | firkins | US legal cups |
|---|---|---|---|
| 1 | = 170.478375 | 6 | = 1022.87025 |
| 2 | = 340.95675 | 7 | = 1193.348625 |
| 3 | = 511.435125 | 8 | = 1363.827 |
| 4 | = 681.9135 | 9 | = 1534.305375 |
| 5 | = 852.391875 | 10 | = 1704.78375 |
| US legal cups | firkins |
|---|---|
| 1 | = 0.0058658 |
| 170.478375 | = 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 …) |