Light year to Astronomical unit Converter (and vice versa)
Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026
This converter allows you to convert light years [ly] to astronomical units [au] or astronomical units [au] to light years [ly]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.
Convert light years to astronomical units
There are two simple ways to convert light years [ly] to astronomical units [au]. In the first calculation method, the value in light years [ly] is divided by the rounded conversion factor of 1.581 * 10-5. The second method multiplies the value in light years [ly] by the rounded conversion factor of 63,241.0771.
- Astronomical units [au] ≈ light years [ly] ÷ (1.581 * 10-5)
- Astronomical units [au] ≈ light years [ly] * 63,241.0771
However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of light years [ly] to astronomical units [au] can be achieved using the following calculation method.
- Astronomical units [au] = light years [ly] * 3,981,712 * 23,760,459 ÷ 23,367 ÷ 64,021
Convert astronomical units to light years
Converting astronomical units [au] to light years [ly] is easy and can be done in two ways. The first method involves multiplication, in which the value in astronomical units [au] is multiplied by the rounded conversion factor of 1.581 * 10-5. The second variant is a division. Here, the value in astronomical units [au] is divided by the rounded conversion factor of 63,241.0771.
- Light years [ly] ≈ astronomical units [au] * 1.581 * 10-5
- Light years [ly] ≈ astronomical units [au] ÷ 63,241.0771
However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of astronomical units [au] to light years [ly] can be achieved using the following calculation method.
- Light years [ly] = astronomical units [au] ÷ 3,981,712 ÷ 23,760,459 * 23,367 * 64,021
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