MLY - Numerical Value

Numerical Value

1 light-year =
SI units
9.4607×10^12 km 9.4607×10^15 m
Astronomical units
63.241×10^3 AU 0.3066 pc
US customary / Imperial units
5.8786×10^12 mi 31.039×10^15 ft

1 light-year = 9460730472580800 metres (exactly)

≈ 5878625 million miles
≈ 63241.1 astronomical units
≈ 0.306601 parsecs

The figures above are based on a Julian year (not Gregorian year) of exactly 365.25 days (each of exactly 86400 SI seconds, totalling 31557600 seconds) and a defined speed of light of 299792458 m/s, both included in the IAU (1976) System of Astronomical Constants, used since 1984.

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