Astronomical Unit to Span Converter

Length Converter

31 units available

Decimals:

From

To

654,408,883,202.0997

1 AU = 654,408,883,202.0997 span

Formula:

span = AU × 6.544089e+11

With your value: 1 AU = 654,408,883,202.0997 span

How big is that?

Everyday references on a logarithmic scale, all expressed in astronomical unit so you can sanity-check the result.

Olympic pool (1/3.0e+9 your value)3.34e-10 AU

Football pitch (length) (1/1.4e+9 your value)7.02e-10 AU

Eiffel Tower (1/4.5e+8 your value)2.21e-9 AU

Burj Khalifa (1/1.8e+8 your value)5.53e-9 AU

Marathon (1/3.5e+6 your value)2.82e-7 AU

Your value1.00 AU

Other Astronomical Unit to Span conversions

2 AU to span 3 AU to span 4 AU to span 5 AU to span 6 AU to span 7 AU to span 8 AU to span

Astronomical Unit to Span Conversion Table

Astronomical Unit (AU)	Span (span)
0.5	327,204,441,601.04987
1	654,408,883,202.0997
2	1.308818e+12
5	3.272044e+12
10	6.544089e+12
15	9.816133e+12
20	1.308818e+13
25	1.636022e+13
50	3.272044e+13
100	6.544089e+13
250	1.636022e+14
500	3.272044e+14
1000	6.544089e+14

Span to Astronomical Unit Conversion Table

Span (span)	Astronomical Unit (AU)
0.5	7.640483e-13
1	1.528097e-12
2	3.056193e-12
5	7.640483e-12
10	1.528097e-11
15	2.292145e-11
20	3.056193e-11
25	3.820242e-11
50	7.640483e-11
100	1.528097e-10
250	3.820242e-10
500	7.640483e-10
1000	1.528097e-9

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Astronomical Unit (AU)

Length

Exact conversion

The astronomical unit is exactly 149 597 870 700 m (IAU Resolution B2, 2012).

Source: IAU Resolution B2 (2012) — definition of the astronomical unit; IAU B2 (2015) nominal values

International Astronomical Union · Reviewed 2026-07-01

Span (span)

Length

Exact conversion

Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Astronomical Unit to Span

To convert from Astronomical Unit (AU) to Span (span), multiply the value by 654,408,883,202.0997.

Formula: span = AU × 6.544089e+11

Reverse: AU = span × 1.528097e-12

Step-by-Step Example

Start with your value in Astronomical Unit. For example: 5 AU
Multiply by the conversion factor: 5 x 654,408,883,202.0997
The result is: 3.272044e+12 span

About Astronomical Unit

The astronomical unit (AU) is defined as exactly 149,597,870,700 metres, close to the mean Earth–Sun distance. It is the natural yardstick for the Solar System.

Common uses: planetary science, orbital mechanics, astronomy.

About Span

The span (span) is a unit of distance and length. One span equals 0.2286 metres. UnitConvertLab converts it against every other length unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: length calculations, engineering and science, education.

Frequently Asked Questions

How many Span are in 1 Astronomical Unit?

There are exactly 654,408,883,202.0997 Span in 1 Astronomical Unit. This means the conversion factor from Astronomical Unit to Span is 654,408,883,202.0997.

What is the formula to convert Astronomical Unit to Span?

The formula to convert Astronomical Unit to Span is: span = AU × 6.544089e+11. For example, to convert 10 Astronomical Unit to Span, you would multiply 10 by 654,408,883,202.0997.

What is a Astronomical Unit?