Hectometer to Astronomical Unit Converter

Length Converter

31 units available

Decimals:

From

To

6.684587e-10

1 hm = 6.684587e-10 AU

Formula:

AU = hm × 6.684587e-10

With your value: 1 hm = 6.684587e-10 AU

How big is that?

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

London double-decker bus (1/9.1 your value)0.110 hm

Olympic pool (1/2.0 your value)0.500 hm

Your value1.00 hm

Football pitch (length) (1.1× your value)1.05 hm

Eiffel Tower (3.3× your value)3.30 hm

Burj Khalifa (8.3× your value)8.28 hm

Other Hectometer to Astronomical Unit conversions

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

Hectometer to Astronomical Unit Conversion Table

Hectometer (hm)	Astronomical Unit (AU)
0.5	3.342294e-10
1	6.684587e-10
2	1.336917e-9
5	3.342294e-9
10	6.684587e-9
15	1.002688e-8
20	1.336917e-8
25	1.671147e-8
50	3.342294e-8
100	6.684587e-8
250	1.671147e-7
500	3.342294e-7
1000	6.684587e-7

Astronomical Unit to Hectometer Conversion Table

Astronomical Unit (AU)	Hectometer (hm)
0.5	747,989,353.5
1	1,495,978,707
2	2,991,957,414
5	7,479,893,535
10	14,959,787,070
15	22,439,680,605
20	29,919,574,140
25	37,399,467,675
50	74,798,935,350
100	149,597,870,700
250	373,994,676,750
500	747,989,353,500
1000	1.495979e+12

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.

Hectometer (hm)

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 Hectometer to Astronomical Unit

To convert from Hectometer (hm) to Astronomical Unit (AU), multiply the value by 6.684587e-10.

Formula: AU = hm × 6.684587e-10

Reverse: hm = AU × 1.495979e+9

Step-by-Step Example

Start with your value in Hectometer. For example: 5 hm
Multiply by the conversion factor: 5 x 6.684587e-10
The result is: 3.342294e-9 AU

About Hectometer

The hectometer (hm) is a unit of distance and length. One hectometer equals 100 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 Hectometer?

There are exactly 6.684587e-10 Astronomical Unit in 1 Hectometer. This means the conversion factor from Hectometer to Astronomical Unit is 6.684587e-10.

What is the formula to convert Hectometer to Astronomical Unit?

The formula to convert Hectometer to Astronomical Unit is: AU = hm × 6.684587e-10. For example, to convert 10 Hectometer to Astronomical Unit, you would multiply 10 by 6.684587e-10.

What is a Hectometer?