Fermi to Astronomical Unit Converter

Length Converter

31 units available

Decimals:

From

To

6.684587e-27

1 fm = 6.684587e-27 AU

Formula:

AU = fm × 6.684587e-27

With your value: 1 fm = 6.684587e-27 AU

How big is that?

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

Your value1.00 fm

Grain of sand (5.0e+11× your value)5.00e+11 fm

Credit card (long side) (8.6e+13× your value)8.56e+13 fm

A4 sheet (height) (3.0e+14× your value)2.97e+14 fm

Adult stride (7.5e+14× your value)7.50e+14 fm

Standard door height (2.0e+15× your value)2.00e+15 fm

Other Fermi to Astronomical Unit conversions

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

Fermi to Astronomical Unit Conversion Table

Fermi (fm)	Astronomical Unit (AU)
0.5	3.342294e-27
1	6.684587e-27
2	1.336917e-26
5	3.342294e-26
10	6.684587e-26
15	1.002688e-25
20	1.336917e-25
25	1.671147e-25
50	3.342294e-25
100	6.684587e-25
250	1.671147e-24
500	3.342294e-24
1000	6.684587e-24

Astronomical Unit to Fermi Conversion Table

Astronomical Unit (AU)	Fermi (fm)
0.5	7.479894e+25
1	1.495979e+26
2	2.991957e+26
5	7.479894e+26
10	1.495979e+27
15	2.243968e+27
20	2.991957e+27
25	3.739947e+27
50	7.479894e+27
100	1.495979e+28
250	3.739947e+28
500	7.479894e+28
1000	1.495979e+29

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.

Fermi (fm)

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 Fermi to Astronomical Unit

To convert from Fermi (fm) to Astronomical Unit (AU), multiply the value by 6.684587e-27.

Formula: AU = fm × 6.684587e-27

Reverse: fm = AU × 1.495979e+26

Step-by-Step Example

Start with your value in Fermi. For example: 5 fm
Multiply by the conversion factor: 5 x 6.684587e-27
The result is: 3.342294e-26 AU

About Fermi

The fermi (fm) is a unit of distance and length. One fermi equals 1.000000 × 10^-15 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 Fermi?

There are exactly 6.684587e-27 Astronomical Unit in 1 Fermi. This means the conversion factor from Fermi to Astronomical Unit is 6.684587e-27.

What is the formula to convert Fermi to Astronomical Unit?

The formula to convert Fermi to Astronomical Unit is: AU = fm × 6.684587e-27. For example, to convert 10 Fermi to Astronomical Unit, you would multiply 10 by 6.684587e-27.

What is a Fermi?