| long hundredweight | 1 long cwt | 2 long cwt | 3 long cwt | 4 long cwt | 5 long cwt | 6 long cwt | 7 long cwt | 8 long cwt | 9 long cwt | 10 long cwt | 11 long cwt | 12 long cwt | 13 long cwt | 14 long cwt | 15 long cwt | 16 long cwt | 17 long cwt | 18 long cwt | 19 long cwt | 20 long cwt | 21 long cwt | 22 long cwt | 23 long cwt | 24 long cwt | 25 long cwt | 26 long cwt | 27 long cwt | 28 long cwt | 29 long cwt | 30 long cwt | 31 long cwt | 32 long cwt | 33 long cwt | 34 long cwt | 35 long cwt | 36 long cwt | 37 long cwt | 38 long cwt | 39 long cwt | 40 long cwt | 41 long cwt | 42 long cwt | 43 long cwt | 44 long cwt | 45 long cwt | 46 long cwt | 47 long cwt | 48 long cwt | 49 long cwt | 50 long cwt | 51 long cwt | 52 long cwt | 53 long cwt | 54 long cwt | 55 long cwt | 56 long cwt | 57 long cwt | 58 long cwt | 59 long cwt | 60 long cwt | 61 long cwt | 62 long cwt | 63 long cwt | 64 long cwt | 65 long cwt | 66 long cwt | 67 long cwt | 68 long cwt | 69 long cwt | 70 long cwt | 71 long cwt | 72 long cwt | 73 long cwt | 74 long cwt | 75 long cwt | 76 long cwt | 77 long cwt | 78 long cwt | 79 long cwt | 80 long cwt | 81 long cwt | 82 long cwt | 83 long cwt | 84 long cwt | 85 long cwt | 86 long cwt | 87 long cwt | 88 long cwt | 89 long cwt | 90 long cwt | 91 long cwt | 92 long cwt | 93 long cwt | 94 long cwt | 95 long cwt | 96 long cwt | 97 long cwt | 98 long cwt | 99 long cwt | 100 long cwt |
| femtogram | 5.080234544 × 1019 fg | 1.0160469088 × 1020 fg | 1.5240703632 × 1020 fg | 2.0320938176 × 1020 fg | 2.540117272 × 1020 fg | 3.0481407264 × 1020 fg | 3.5561641808 × 1020 fg | 4.0641876352 × 1020 fg | 4.5722110896 × 1020 fg | 5.080234544 × 1020 fg | 5.5882579984 × 1020 fg | 6.0962814528 × 1020 fg | 6.6043049072 × 1020 fg | 7.1123283616 × 1020 fg | 7.620351816 × 1020 fg | 8.1283752704 × 1020 fg | 8.6363987248 × 1020 fg | 9.1444221792 × 1020 fg | 9.6524456336 × 1020 fg | 1.0160469088 × 1021 fg | 1.06684925424 × 1021 fg | 1.11765159968 × 1021 fg | 1.16845394512 × 1021 fg | 1.21925629056 × 1021 fg | 1.270058636 × 1021 fg | 1.32086098144 × 1021 fg | 1.37166332688 × 1021 fg | 1.42246567232 × 1021 fg | 1.47326801776 × 1021 fg | 1.5240703632 × 1021 fg | 1.57487270864 × 1021 fg | 1.62567505408 × 1021 fg | 1.67647739952 × 1021 fg | 1.72727974496 × 1021 fg | 1.7780820904 × 1021 fg | 1.82888443584 × 1021 fg | 1.87968678128 × 1021 fg | 1.93048912672 × 1021 fg | 1.98129147216 × 1021 fg | 2.0320938176 × 1021 fg | 2.08289616304 × 1021 fg | 2.13369850848 × 1021 fg | 2.18450085392 × 1021 fg | 2.23530319936 × 1021 fg | 2.2861055448 × 1021 fg | 2.33690789024 × 1021 fg | 2.38771023568 × 1021 fg | 2.43851258112 × 1021 fg | 2.48931492656 × 1021 fg | 2.540117272 × 1021 fg | 2.59091961744 × 1021 fg | 2.64172196288 × 1021 fg | 2.69252430832 × 1021 fg | 2.74332665376 × 1021 fg | 2.7941289992 × 1021 fg | 2.84493134464 × 1021 fg | 2.89573369008 × 1021 fg | 2.94653603552 × 1021 fg | 2.99733838096 × 1021 fg | 3.0481407264 × 1021 fg | 3.09894307184 × 1021 fg | 3.14974541728 × 1021 fg | 3.20054776272 × 1021 fg | 3.25135010816 × 1021 fg | 3.3021524536 × 1021 fg | 3.35295479904 × 1021 fg | 3.40375714448 × 1021 fg | 3.45455948992 × 1021 fg | 3.50536183536 × 1021 fg | 3.5561641808 × 1021 fg | 3.60696652624 × 1021 fg | 3.65776887168 × 1021 fg | 3.70857121712 × 1021 fg | 3.75937356256 × 1021 fg | 3.810175908 × 1021 fg | 3.86097825344 × 1021 fg | 3.91178059888 × 1021 fg | 3.96258294432 × 1021 fg | 4.01338528976 × 1021 fg | 4.0641876352 × 1021 fg | 4.11498998064 × 1021 fg | 4.16579232608 × 1021 fg | 4.21659467152 × 1021 fg | 4.26739701696 × 1021 fg | 4.3181993624 × 1021 fg | 4.36900170784 × 1021 fg | 4.41980405328 × 1021 fg | 4.47060639872 × 1021 fg | 4.52140874416 × 1021 fg | 4.5722110896 × 1021 fg | 4.62301343504 × 1021 fg | 4.67381578048 × 1021 fg | 4.72461812592 × 1021 fg | 4.77542047136 × 1021 fg | 4.8262228168 × 1021 fg | 4.87702516224 × 1021 fg | 4.92782750768 × 1021 fg | 4.97862985312 × 1021 fg | 5.02943219856 × 1021 fg | 5.080234544 × 1021 fg |
The long or imperial hundredweight of 8 stone (112 lb or 50.802345 kg) sees informal use in the imperial system but according to Schedule 1, Part VI of the Weights and Measures Act 1985, is no longer to be used for trade after the Act came into force.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| long hundredweight | long cwt | ≡ 112 lb av | = 50.80234544 kg | Imperial/US |
| long hundredweights | femtograms | long hundredweights | femtograms |
|---|---|---|---|
| 1 | = 5.080234544E+19 | 11 | = 5.5882579984E+20 |
| 2.5 | = 1.270058636E+20 | 12.5 | = 6.35029318E+20 |
| 4 | = 2.0320938176E+20 | 14 | = 7.1123283616E+20 |
| 5.5 | = 2.7941289992E+20 | 15.5 | = 7.8743635432E+20 |
| 7 | = 3.5561641808E+20 | 17 | = 8.6363987248E+20 |
| 8.5 | = 4.3181993624E+20 | 18.5 | = 9.3984339064E+20 |
| 10 | = 5.080234544E+20 | 20 | = 1.0160469088E+21 |
Femtogram or femtogramme is equal to 10-15 gram (unit of mass), comes from a combination of the metric prefix femto (f) with the gram (g). Plural name is femtograms.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| femtogram | fg | ≡ 10-15 g | ≡ 10-18 kg | Metric system SI |
| femtograms | long hundredweights | femtograms | long hundredweights |
|---|---|---|---|
| 1 | = 1.9684130552221E-20 | 11 | = 2.1652543607443E-19 |
| 2.5 | = 4.9210326380553E-20 | 12.5 | = 2.4605163190277E-19 |
| 4 | = 7.8736522208885E-20 | 14 | = 2.755778277311E-19 |
| 5.5 | = 1.0826271803722E-19 | 15.5 | = 3.0510402355943E-19 |
| 7 | = 1.3778891386555E-19 | 17 | = 3.3463021938776E-19 |
| 8.5 | = 1.6731510969388E-19 | 18.5 | = 3.6415641521609E-19 |
| 10 | = 1.9684130552221E-19 | 20 | = 3.9368261104442E-19 |
| long hundredweights | femtograms |
|---|---|
| 1 | = 5.080234544 × 1019 |
| 1.9684130552221 × 10-20 | = 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 …) |