How many fathoms are in 1 AU?

One AU contains approximately 8.181 x 1010 fathoms (about 81.8 billion fathoms). Since 1 AU = 149,597,870,700 meters and 1 fathom = 1.8288 meters, divide the former by the latter.

How deep is the Challenger Deep in AU?

The Challenger Deep at about 10,994 meters (6,011 fathoms) is approximately 7.35 x 10-8 AU, or about 74 billionths of an AU. The entire ocean is a tiny scratch on the astronomical scale.

Does anyone convert between AU and fathoms?

No. These units belong to completely separate fields: astronomy and maritime navigation. The conversion exists only for mathematical completeness in unit conversion tools.

Astronomical Units to Fathoms (au to ftm) Converter

1 au = 81,801,110,400.2625 ftm

1 Astronomical Unit equals 81,801,110,400.2625 Fathoms (1 au = 81,801,110,400.2625 ftm). Convert Astronomical Units to Fathoms with formula, table, and examples.

One astronomical unit equals approximately 8.181 x 10¹⁰ fathoms, or about 81.8 billion fathoms. This conversion connects the solar system distance unit with the maritime depth unit (6 feet / 1.8288 m). No oceanographer has ever measured interplanetary distances, and no astronomer has measured ocean depths in AU.

How to Convert Astronomical Units to Fathoms

ftm = au × 81,801,110,400.2624664307

Multiply the value in Astronomical Units by 81,801,110,400.2624664307

Take your value in Astronomical Units
Multiply by 81,801,110,400.2624664307
Read the result in Fathoms

Common Astronomical Units to Fathoms Conversions

Astronomical Units (au)	Fathoms (ftm)	Status
1 × 10⁻¹⁰ au	8.1801 ftm
1 × 10⁻⁹ au	81.8011 ftm
1 × 10⁻⁸ au	818.0111 ftm
1 × 10⁻⁷ au	8,180.111 ftm
0.000001 au	81,801.1104 ftm
0.00001 au	818,011.104 ftm
0.0001 au	8,180,111.04 ftm
0.001 au	81,801,110.4003 ftm
0.01 au	818,011,104.0026 ftm
0.1 au	8,180,111,040.0263 ftm
1 au	81,801,110,400.2625 ftm

Good to Know About Astronomical Units to Fathoms Conversion

Shakespeare's 'full fathom five' (30 feet) and the 93-million-mile Earth-Sun distance represent perhaps the most extreme contrast between literary and scientific measurement. Both are valid ways of understanding distance, just at incompatible scales.

Astronomical Units to Fathoms: What You Need to Know

The deepest ocean point (Challenger Deep at about 6,000 fathoms) is only 0.0000000733 AU below sea level. Conversely, the Earth-Sun distance would be about 81.8 billion fathoms of ocean depth if such a thing existed. These numbers illustrate the vast difference between oceanographic and astronomical scales.

What is a Astronomical Unit? au

Exactly 149,597,870,700 meters by IAU 2012 definition. Roughly the average distance from the Earth to the Sun. Used for distances within our solar system.

Astronomical solar system distances astronomy planetary science

Learn more about Astronomical Unit →

What is a Fathom? ftm

Exactly 6 feet (1.8288 m). Traditionally used to measure water depth in nautical contexts. Originally based on the span of outstretched arms.

Imperial water depth nautical marine charts

Learn more about Fathom →

Going the other way? Use our Fathoms to Astronomical Units converter.

Astronomical Units to Fathoms FAQ

One AU contains approximately 8.181 x 10¹⁰ fathoms (about 81.8 billion fathoms). Since 1 AU = 149,597,870,700 meters and 1 fathom = 1.8288 meters, divide the former by the latter.
The Challenger Deep at about 10,994 meters (6,011 fathoms) is approximately 7.35 x 10^-8 AU, or about 74 billionths of an AU. The entire ocean is a tiny scratch on the astronomical scale.
No. These units belong to completely separate fields: astronomy and maritime navigation. The conversion exists only for mathematical completeness in unit conversion tools.

Non-Frequently Asked Questions About Astronomical Units to Fathoms

Questions nobody should ask - but someone did.

Anchor chain is measured in fathoms. The Earth-Sun distance is about 81.8 billion fathoms. The longest anchor chain ever made is a few hundred fathoms. You would be short by about 81,799,999,700 fathoms. And it would melt.
If space were an ocean 1 AU deep, that would be about 81.8 billion fathoms. The real ocean's deepest point is about 6,011 fathoms. A space ocean would be 13.6 million times deeper than the Mariana Trench. Bring a longer anchor chain.
Literally, no. To fathom means to measure depth with a plumb line. Space has no bottom. Even metaphorically, 81.8 billion fathoms of distance is beyond fathoming. Space is, quite literally, unfathomable.