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Convert au to km

1 astronomical unit equals 149,597,870 kilometers. Enter a value below to convert instantly.

1 AU
149,597,870 km

Multiply the number of astronomical units by 149597870.7 to get kilometers. How this is calculated

Copy link puts your number after the #, which browsers never send to a server — but the link itself carries it, so anyone you send it to sees the value. Save keeps the unit pair in this browser only; clear it any time from your saved list.

Need the other direction? Convert kilometer to astronomical unit →

Formula

Multiply the number of astronomical units by 149597870.7 to get kilometers.

Step by step

  1. Start with 1 AU.
  2. Multiply by the conversion factor 149597870.7.
  3. 1 × 149597870.7 = 149,597,870 km.

Astronomical Units to Kilometers conversion table

Astronomical Units (AU) Kilometers (km)
1 149,597,870
2 299,195,740
3 448,793,610
5 747,989,350
10 1,495,978,700
20 2,991,957,400
50 7,479,893,500
100 14,959,787,000
500 74,798,935,000
1,000 149,597,870,000

Convert Astronomical Unit to other length units

1 AU expressed in every other length unit on this site.

  • Meter m 149,597,870,000
  • Kilometer km 149,597,870
  • Hectometer hm 1,495,978,700
  • Dekameter dam 14,959,787,000
  • Decimeter dm 1,495,978,700,000
  • Centimeter cm 14,959,787,000,000
  • Millimeter mm 149,597,870,000,000
  • Micrometer µm 1.4959787e+17
  • Nanometer nm 1.4959787e+20
  • Picometer pm 1.4959787e+23
  • Femtometer fm 1.4959787e+26
  • Attometer am 1.4959787e+29
  • Megameter Mm 149,597.87
  • Gigameter Gm 149.59787
  • Terameter Tm 0.14959787
  • Petameter Pm 0.00014959787
  • Exameter Em 1.4959787e-7
  • Angstrom Å 1.4959787e+21
  • Mile mi 92,955,807
  • Yard yd 163,602,220,000
  • Foot ft 490,806,660,000
  • Inch in 5,889,679,900,000
  • Kiloyard kyd 163,602,220
  • League lea 30,985,269
  • Furlong fur 743,646,460
  • Chain ch 7,436,464,600
  • Rod rd 29,745,858,000
  • Perch perch 29,745,858,000
  • Pole pole 29,745,858,000
  • Rope rope 24,540,333,000
  • Fathom fath 81,801,110,000
  • Link li 743,646,460,000
  • Hand hand 1,472,420,000,000
  • Ell ell 130,881,780,000
  • Barleycorn barleycorn 17,669,040,000,000
  • Mil mil 5.8896799e+15
  • Microinch µin 5.8896799e+18
  • Caliber cl 588,967,990,000,000
  • Centiinch cin 588,967,990,000,000
  • Nautical Mile nmi 80,776,388
  • Nautical Mile (UK) NM (UK) 80,724,780
  • Nautical League nl 26,925,463
  • Nautical League (UK) nl (UK) 26,908,260
  • Mile (US survey) mi (US) 92,955,621
  • Furlong (US survey) fur (US) 743,644,970
  • Chain (US survey) ch (US) 7,436,449,700
  • Rod (US survey) rd (US) 29,745,799,000
  • Fathom (US survey) fath (US) 81,800,947,000
  • Foot (US survey) ft (US) 490,805,680,000
  • Link (US survey) li (US) 743,644,970,000
  • Inch (US survey) in (US) 5,889,668,200,000
  • League (statute) st.league 30,985,207
  • Pica pica 35,338,080,000,000
  • Point pt 424,056,960,000,000
  • Twip twip 8.4811391e+15
  • Light Year ly 0.000015812507
  • Parsec pc 0.0000048481368
  • Kiloparsec kpc 4.8481368e-9
  • Megaparsec Mpc 4.8481368e-12
  • Earth's Equatorial Radius R⊕(eq) 23,454.791
  • Earth's Polar Radius R⊕(pol) 23,533.695
  • Earth's Distance from Sun d⊕☉ 0.99998577
  • Sun's Radius R☉ 215.03216
  • Bohr Radius a₀ 2.82699e+21
  • Electron Radius (classical) rₑ 5.3087665e+25
  • Fermi F 1.4959787e+26
  • X-unit X 1.4928735e+24
  • Planck Length ℓP 9.2558334e+45
  • Mile (Roman) mi (Rom) 101,093,030
  • Roman Actus actus 4,216,552,100
  • Arpent arpent 2,556,284,700
  • Cubit (UK) cubit 327,204,440,000
  • Cubit (Greek) cubit (Gk) 323,253,560,000
  • Long Cubit long cubit 280,460,950,000
  • Reed reed 54,534,074,000
  • Long Reed long reed 46,743,492,000
  • Span (cloth) span 654,408,880,000
  • Finger (cloth) finger 1,308,817,800,000
  • Nail (cloth) nail 2,617,635,500,000
  • Handbreadth handbreadth 1,963,226,600,000
  • Fingerbreadth fingerbreadth 7,852,906,600,000
  • Aln aln 251,942,520,000
  • Famn famn 83,980,841,000
  • Ken ken 70,619,664,000
  • Russian Archin archin 210,345,710,000
  • Vara Castellana vara (cast) 179,126,520,000
  • Vara Conuquera vara (con) 59,708,840,000
  • Vara de Tarea vara (tarea) 59,708,840,000
  • Ja (Korean foot) 자 493,672,970,000
  • Chi 치 4,936,729,700,000
  • Pun 푼 49,367,297,000,000
  • Gan 간 82,278,829,000
  • Jang 장 49,367,297,000
  • Ri (Korean) 리 380,920,500

About the astronomical unit

The astronomical unit (AU) is a Other unit of length. Defined by the IAU as exactly 149,597,870,700 m — roughly the Earth–Sun distance.

About the kilometer

The kilometer (km) is a SI unit of length.

Where this conversion is used

Converting astronomical units to kilometers comes up when measuring height, screen sizes, travel distances, fabric, and construction dimensions. Metric and Imperial length units are both in daily use, so quick conversion is often needed when following instructions from another country.

Related conversions

Frequently asked questions

How many kilometers are in a astronomical unit?

One astronomical unit equals 149,597,870 kilometers.

How do you convert astronomical units to kilometers?

Multiply the number of astronomical units by 149597870.7 to get kilometers.

What is 1 kilometer in astronomical units?

One kilometer equals 6.6845871e-9 astronomical units.

When would I convert astronomical units to kilometers?

This conversion is common when measuring height, screen sizes, travel distances, fabric, and construction dimensions.

Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.