| fermtometer | 1 fm | 2 fm | 3 fm | 4 fm | 5 fm | 6 fm | 7 fm | 8 fm | 9 fm | 10 fm | 11 fm | 12 fm | 13 fm | 14 fm | 15 fm | 16 fm | 17 fm | 18 fm | 19 fm | 20 fm | 21 fm | 22 fm | 23 fm | 24 fm | 25 fm | 26 fm | 27 fm | 28 fm | 29 fm | 30 fm | 31 fm | 32 fm | 33 fm | 34 fm | 35 fm | 36 fm | 37 fm | 38 fm | 39 fm | 40 fm | 41 fm | 42 fm | 43 fm | 44 fm | 45 fm | 46 fm | 47 fm | 48 fm | 49 fm | 50 fm | 51 fm | 52 fm | 53 fm | 54 fm | 55 fm | 56 fm | 57 fm | 58 fm | 59 fm | 60 fm | 61 fm | 62 fm | 63 fm | 64 fm | 65 fm | 66 fm | 67 fm | 68 fm | 69 fm | 70 fm | 71 fm | 72 fm | 73 fm | 74 fm | 75 fm | 76 fm | 77 fm | 78 fm | 79 fm | 80 fm | 81 fm | 82 fm | 83 fm | 84 fm | 85 fm | 86 fm | 87 fm | 88 fm | 89 fm | 90 fm | 91 fm | 92 fm | 93 fm | 94 fm | 95 fm | 96 fm | 97 fm | 98 fm | 99 fm | 100 fm |
| rod | 1.9883878151595 × 10-16 rd | 3.9767756303189 × 10-16 rd | 5.9651634454784 × 10-16 rd | 7.9535512606379 × 10-16 rd | 9.9419390757973 × 10-16 rd | 1.1930326890957 × 10-15 rd | 1.3918714706116 × 10-15 rd | 1.5907102521276 × 10-15 rd | 1.7895490336435 × 10-15 rd | 1.9883878151595 × 10-15 rd | 2.1872265966754 × 10-15 rd | 2.3860653781914 × 10-15 rd | 2.5849041597073 × 10-15 rd | 2.7837429412233 × 10-15 rd | 2.9825817227392 × 10-15 rd | 3.1814205042551 × 10-15 rd | 3.3802592857711 × 10-15 rd | 3.579098067287 × 10-15 rd | 3.777936848803 × 10-15 rd | 3.9767756303189 × 10-15 rd | 4.1756144118349 × 10-15 rd | 4.3744531933508 × 10-15 rd | 4.5732919748668 × 10-15 rd | 4.7721307563827 × 10-15 rd | 4.9709695378987 × 10-15 rd | 5.1698083194146 × 10-15 rd | 5.3686471009306 × 10-15 rd | 5.5674858824465 × 10-15 rd | 5.7663246639625 × 10-15 rd | 5.9651634454784 × 10-15 rd | 6.1640022269944 × 10-15 rd | 6.3628410085103 × 10-15 rd | 6.5616797900262 × 10-15 rd | 6.7605185715422 × 10-15 rd | 6.9593573530581 × 10-15 rd | 7.1581961345741 × 10-15 rd | 7.35703491609 × 10-15 rd | 7.555873697606 × 10-15 rd | 7.7547124791219 × 10-15 rd | 7.9535512606379 × 10-15 rd | 8.1523900421538 × 10-15 rd | 8.3512288236698 × 10-15 rd | 8.5500676051857 × 10-15 rd | 8.7489063867017 × 10-15 rd | 8.9477451682176 × 10-15 rd | 9.1465839497336 × 10-15 rd | 9.3454227312495 × 10-15 rd | 9.5442615127655 × 10-15 rd | 9.7431002942814 × 10-15 rd | 9.9419390757973 × 10-15 rd | 1.0140777857313 × 10-14 rd | 1.0339616638829 × 10-14 rd | 1.0538455420345 × 10-14 rd | 1.0737294201861 × 10-14 rd | 1.0936132983377 × 10-14 rd | 1.1134971764893 × 10-14 rd | 1.1333810546409 × 10-14 rd | 1.1532649327925 × 10-14 rd | 1.1731488109441 × 10-14 rd | 1.1930326890957 × 10-14 rd | 1.2129165672473 × 10-14 rd | 1.2328004453989 × 10-14 rd | 1.2526843235505 × 10-14 rd | 1.2725682017021 × 10-14 rd | 1.2924520798537 × 10-14 rd | 1.3123359580052 × 10-14 rd | 1.3322198361568 × 10-14 rd | 1.3521037143084 × 10-14 rd | 1.37198759246 × 10-14 rd | 1.3918714706116 × 10-14 rd | 1.4117553487632 × 10-14 rd | 1.4316392269148 × 10-14 rd | 1.4515231050664 × 10-14 rd | 1.471406983218 × 10-14 rd | 1.4912908613696 × 10-14 rd | 1.5111747395212 × 10-14 rd | 1.5310586176728 × 10-14 rd | 1.5509424958244 × 10-14 rd | 1.570826373976 × 10-14 rd | 1.5907102521276 × 10-14 rd | 1.6105941302792 × 10-14 rd | 1.6304780084308 × 10-14 rd | 1.6503618865824 × 10-14 rd | 1.670245764734 × 10-14 rd | 1.6901296428855 × 10-14 rd | 1.7100135210371 × 10-14 rd | 1.7298973991887 × 10-14 rd | 1.7497812773403 × 10-14 rd | 1.7696651554919 × 10-14 rd | 1.7895490336435 × 10-14 rd | 1.8094329117951 × 10-14 rd | 1.8293167899467 × 10-14 rd | 1.8492006680983 × 10-14 rd | 1.8690845462499 × 10-14 rd | 1.8889684244015 × 10-14 rd | 1.9088523025531 × 10-14 rd | 1.9287361807047 × 10-14 rd | 1.9486200588563 × 10-14 rd | 1.9685039370079 × 10-14 rd | 1.9883878151595 × 10-14 rd |
The femtometre (American spelling femtometer, symbol fm derived from the Danish and Norwegian word femten, "fifteen"+Ancient Greek: μέτρον, metrοn, "unit of measurement") is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one. This distance can also be called a fermi and was so named in honour of physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| fermtometer | fm | 1000 attometres = 1 femtometre = 1 fermi = 0.001 picometre = 1×10−15 metres 1000000 femtometres = 10 ångström = 1 nanometre. | ≡ 1×10-15 m | Metric system SI |
| fermtometers | rods | fermtometers | rods |
|---|---|---|---|
| 1 | = 1.9883878151595E-16 | 4 | = 7.9535512606379E-16 |
| 1.5 | = 2.9825817227392E-16 | 4.5 | = 8.9477451682176E-16 |
| 2 | = 3.9767756303189E-16 | 5 | = 9.9419390757973E-16 |
| 2.5 | = 4.9709695378987E-16 | 5.5 | = 1.0936132983377E-15 |
| 3 | = 5.9651634454784E-16 | 6 | = 1.1930326890957E-15 |
The rod or perch or pole is a surveyors tool and unit of length equal to 5 1⁄2 yards, 16 1⁄2 feet, 1⁄320 of a statute mile or one-fourth of a surveyor's chain and 5.0292 meters.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| rod | rd | ≡ 16 1⁄2 ft | = 5.0292 m | Imperial/US |
| rods | fermtometers | rods | fermtometers |
|---|---|---|---|
| 1 | = 5.0292E+15 | 4 | = 2.01168E+16 |
| 1.5 | = 7.5438E+15 | 4.5 | = 2.26314E+16 |
| 2 | = 1.00584E+16 | 5 | = 2.5146E+16 |
| 2.5 | = 1.2573E+16 | 5.5 | = 2.76606E+16 |
| 3 | = 1.50876E+16 | 6 | = 3.01752E+16 |
| fermtometers | rods |
|---|---|
| 1 | = 1.9883878151595 × 10-16 |
| 5.0292 × 1015 | = 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 …) |