Astronomical unit to Light second Converter (and vice versa)

Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026

This converter allows you to convert astronomical units [au] to light seconds [ls] or light seconds [ls] to astronomical units [au]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.

1 astronomical unit [au] ≈ 499.0048 light seconds [ls]1 light second [ls] ≈ 0.002 astronomical units [au]

Convert astronomical units to light seconds

There are two simple ways to convert astronomical units [au] to light seconds [ls]. In the first calculation method, the value in astronomical units [au] is divided by the rounded conversion factor of 0.002. The second method multiplies the value in astronomical units [au] by the rounded conversion factor of 499.0048.

  • Light seconds [ls] ≈ astronomical units [au] ÷ 0.002
  • Light seconds [ls] ≈ astronomical units [au] * 499.0048

However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of astronomical units [au] to light seconds [ls] can be achieved using the following calculation method.

  • Light seconds [ls] = astronomical units [au] ÷ 2,933.39 ÷ 1,022 * 23,367 * 64,021

Convert light seconds to astronomical units

Converting light seconds [ls] to astronomical units [au] is easy and can be done in two ways. The first method involves multiplication, in which the value in light seconds [ls] is multiplied by the rounded conversion factor of 0.002. The second variant is a division. Here, the value in light seconds [ls] is divided by the rounded conversion factor of 499.0048.

  • Astronomical units [au] ≈ light seconds [ls] * 0.002
  • Astronomical units [au] ≈ light seconds [ls] ÷ 499.0048

However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of light seconds [ls] to astronomical units [au] can be achieved using the following calculation method.

  • Astronomical units [au] = light seconds [ls] * 2,933.39 * 1,022 ÷ 23,367 ÷ 64,021

Converter

Decimal places

How it's calculated

Factor: 
≈ 499.005
Light seconds = Astronomical units ÷ 2,933.39 ÷ 1,022 * 23,367 * 64,021
Astronomical units = Light seconds * 2,933.39 * 1,022 ÷ 23,367 ÷ 64,021

To all available units

Astronomical units

Megaparsecs

Astronomical units

Parsecs

Astronomical units

Planck length

Attometers

Ångströms

Attometers

Astronomical units

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