As we know One km is equal to 1E+18 fm (1 km = 1E+18 fm).

To convert Kilometer to Femtometer, multiply your km figure by 1E+18.

** Example : **convert 25 km to fm:

25 km = 25 × 1E+18 fm = fm

To convert Femtometer to Kilometer, divide your fm figure by 1E+18.

** Example : **convert 25 fm to km:

25 fm = 25 ÷ 1E+18 km = km

As we know One fm is equal to 1e-18 km (1 fm = 1e-18 km).

To convert Femtometer to Kilometer, multiply your fm figure by 1e-18.

** Example : **convert 45 fm to km:

45 fm = 45 × 1e-18 km = km

To convert Kilometer to Femtometer, divide your km figure by 1e-18.

** Example : **convert 45 km to fm:

45 km = 45 ÷ 1e-18 fm = fm

km to m | 1 km = 1000 m |

km to cm | 1 km = 100000 cm |

km to dm | 1 km = 10000 dm |

km to mm | 1 km = 1000000 mm |

km to um | 1 km = 1E+9 um |

km to nm | 1 km = 1E+12 nm |

km to yd | 1 km = 1093.6132983 yd |

km to ft | 1 km = 3280.839895 ft |

km to mi | 1 km = 0.6213712 mi |

km to in | 1 km = 39370.07874 in |

km to inch (US survey) | 1 km = 39370 inch (US survey) |

km to lea | 1 km = 0.2071237 lea |

km to ly | 1 km = 1.057000834E-13 ly |

km to AU | 1 km = 6.684587122E-9 AU |

km to nautical league (int.) | 1 km = 0.1799856 nautical league (int.) |

km to nautical league (UK) | 1 km = 0.1798706 nautical league (UK) |

km to st.league | 1 km = 0.2071233 st.league |

km to nmi | 1 km = 0.5399568 nmi |

km to NM (UK) | 1 km = 0.5396118 NM (UK) |

km to mi (US) | 1 km = 0.6213699 mi (US) |

km to mile (Roman) | 1 km = 0.6757652 mile (Roman) |

km to fath | 1 km = 546.8066492 fath |

km to ftm | 1 km = 546.8055556 ftm |

km to Em | 1 km = 1E-15 Em |

km to Pm | 1 km = 1E-12 Pm |

km to Tm | 1 km = 1E-9 Tm |

km to Gm | 1 km = 0.000001 Gm |

km to Mm | 1 km = 0.001 Mm |

km to hm | 1 km = 10 hm |

km to dam | 1 km = 100 dam |

km to pm | 1 km = 1E+15 pm |

km to fm | 1 km = 1E+18 fm |

km to am | 1 km = 1E+21 am |

km to u | 1 km = 1E+9 u |

km to Mpc | 1 km = 3.240779289E-20 Mpc |

km to kpc | 1 km = 3.240779289E-17 kpc |

km to pc | 1 km = 3.240779289E-14 pc |

km to kyd | 1 km = 1.0936133 kyd |

km to fur | 1 km = 4.970969537899 fur |

km to fur (US survey) | 1 km = 4.97095959596 fur (US survey) |

km to ch | 1 km = 49.7096954 ch |

km to chain (US survey) | 1 km = 49.709596 chain (US survey) |

km to rope | 1 km = 164.0419948 rope |

km to rd | 1 km = 198.8387815 rd |

km to rod (US survey) | 1 km = 198.8383838 rod (US survey) |

km to perch | 1 km = 198.8387815 perch |

km to pole | 1 km = 198.8387815 pole |

km to ell | 1 km = 874.8906387 ell |

km to foot (US survey) | 1 km = 3280.8333333 foot (US survey) |

km to li | 1 km = 4970.9695379 li |

km to link (US survey) | 1 km = 4970.959596 link (US survey) |

km to cubit (UK) | 1 km = 2187.2265967 cubit (UK) |

km to hand | 1 km = 9842.519685 hand |

km to span (cloth) | 1 km = 4374.4531934 span (cloth) |

km to finger (cloth) | 1 km = 8748.9063867 finger (cloth) |

km to nail (cloth) | 1 km = 17497.812773 nail (cloth) |

km to barleycorn | 1 km = 118110.23622 barleycorn |

km to mil | 1 km = 39370078.74 mil |

km to microinch | 1 km = 39370078740 microinch |

km to A | 1 km = 1E+13 A |

km to a.u. | 1 km = 1.889725988579e+13 a.u. |

km to X | 1 km = 9.979243174198e+15 X |

km to F | 1 km = 1e+18 F |

km to arpent | 1 km = 17.0877078 arpent |

km to pica | 1 km = 236220.47244 pica |

km to point | 1 km = 2834645.6693 point |

km to twip | 1 km = 56692913.386 twip |

km to aln | 1 km = 1684.1317365 aln |

km to famn | 1 km = 561.3772455 famn |

km to cl | 1 km = 3937007.874 cl |

km to cin | 1 km = 3937007.874 cin |

km to ken | 1 km = 472.0632942 ken |

km to Russian archin | 1 km = 1406.0742407 Russian archin |

km to Roman actus | 1 km = 28.1859098 Roman actus |

km to vara de tarea | 1 km = 399.128941 vara de tarea |

km to vara conuquera | 1 km = 399.128941 vara conuquera |

km to vara castellana | 1 km = 1197.386823 vara castellana |

km to long reed | 1 km = 312.4609424 long reed |

km to reed | 1 km = 364.5377661 reed |

km to long cubit | 1 km = 1874.7656543 long cubit |

km to handbreadth | 1 km = 13123.35958 handbreadth |

km to fingerbreadth | 1 km = 52493.43832 fingerbreadth |

km to ℓₚ | 1 km = 6.187927353E+37 ℓₚ |

km to rₑ | 1 km = 3.548690438833e+17 rₑ |

km to a₀ | 1 km = 1.889725988579e+13 a₀ |

km to Earth's equatorial radius | 1 km = 0.0001567850289 Earth's equatorial radius |

km to Earth's polar radius | 1 km = 0.0001573124242 Earth's polar radius |

km to Earth's distance from sun | 1 km = 6.684491978E-9 Earth's distance from sun |

km to Sun's radius | 1 km = 0.000001436781609 Sun's radius |

km to li (里) | 1 km = 2 li (里) |

km to zhang (丈) | 1 km = 300 zhang (丈) |

km to chi (尺) | 1 km = 3000 chi (尺) |

km to cun (寸) | 1 km = 30000 cun (寸) |

** fm.** Since one km equals 1E+18 fm, 9 km in fm will be fm.

There are **1E+18 fm** in one km. In turn, one fm is equal to 1e-18 km.

1 fm is approximately equal to 1e-18 km.

The Kilometer value of 8 fm is km. (i.e.,) 8 x 1e-18 = km.

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