Span to Astronomical Unit Converter

Length Converter

31 units available

Decimals:

From

To

1.528097e-12

1 span = 1.528097e-12 AU

Formula:

AU = span × 1.528097e-12

With your value: 1 span = 1.528097e-12 AU

How big is that?

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

Credit card (long side) (1/2.7 your value)0.374 span

Your value1.00 span

A4 sheet (height) (1.3× your value)1.30 span

Adult stride (3.3× your value)3.28 span

Standard door height (8.7× your value)8.75 span

London double-decker bus (48× your value)48.1 span

Other Span to Astronomical Unit conversions

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

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

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

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.

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

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

How to Convert Span to Astronomical Unit

To convert from Span (span) to Astronomical Unit (AU), multiply the value by 1.528097e-12.

Formula: AU = span × 1.528097e-12

Reverse: span = AU × 6.544089e+11

Step-by-Step Example

Start with your value in Span. For example: 5 span
Multiply by the conversion factor: 5 x 1.528097e-12
The result is: 7.640483e-12 AU

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.

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.

Frequently Asked Questions

How many Astronomical Unit are in 1 Span?

There are exactly 1.528097e-12 Astronomical Unit in 1 Span. This means the conversion factor from Span to Astronomical Unit is 1.528097e-12.

What is the formula to convert Span to Astronomical Unit?

The formula to convert Span to Astronomical Unit is: AU = span × 1.528097e-12. For example, to convert 10 Span to Astronomical Unit, you would multiply 10 by 1.528097e-12.

What is a Span?