Astronomical Unit Converter
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Formula
1 AU = 149,597,870.7 km. 1 ly = 9.461 × 10¹² km. 1 pc = 3.086 × 10¹³ km. 1 mile = 1.60934 km.
Frequently Asked Questions
What is an Astronomical Unit?
One AU is the average distance from Earth to the Sun, approximately 149,597,870.7 km (about 93 million miles).
How far is one light-year?
One light-year is the distance light travels in one year, approximately 9.461 trillion km (5.879 trillion miles).
What is a parsec?
A parsec is approximately 3.086 × 10¹³ km, or about 3.26 light-years. It is defined as the distance at which 1 AU subtends an angle of one arcsecond.