# Order of magnitude (length)

This is a compilation of lengths of various orders of magnitude for comparison purposes. The information is often to be understood as “typical values”; the converted values ​​are rounded.

The basic unit of length in the international system of units is 1  meter ( unit symbol m ). Both the larger length measures up to 1 kilometer and the smaller ones up to the microscopic and submicroscopic units of length are the common decimal multiples .

## Lengths shorter than 1 nm

1 zeptometer is a trillionth of a meter (1 cm = 10 −21 m).
1 attometer is a trillionth of a meter (1 am = 10 −18 m).
1 femtometer is a quadrillionth of a meter (1 fm = 10 −15 m).
1 picometer is a trillionth of a meter (1 pm = 10 −12 m).
1 nanometer is a billionth of a meter (1 nm = 10 −9 m) and the eponym of nanotechnology .

• 1.616 · 10 −35 m - Planck length , currently the smallest physically meaningful length

subatomic to atomic range:

• Cosmic rays contain gamma rays with a wavelength below 30 cm
• 1 fm (1 · 10 −15 m) = 0.000001 nm - approximate size of a proton and a neutron
• 10 fm (1 · 10 −14 m) = 0.00001 nm - approximate size of an atomic nucleus
• 100 pm (1 · 10 −10 m) = 0.1 nm = 1 Å (Ångström) - approximate size of a (hydrogen) atom
• 540 pm - pitch (and approximate diameter) of the protein α-helix

## 1 nm to 10 nm (nanometers)

${\ displaystyle = 1 \ cdot 10 ^ {- 9} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 8} \, \ mathrm {m}}$

## 10 nm to 100 nm

${\ displaystyle = 1 \ cdot 10 ^ {- 8} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 7} \, \ mathrm {m}}$

## 100 nm to 1 μm

${\ displaystyle = 1 \ cdot 10 ^ {- 7} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 6} \, \ mathrm {m}}$

## 1 μm to 10 μm (micrometers)

${\ displaystyle = 1 \ cdot 10 ^ {- 6} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 5} \, \ mathrm {m}}$
• 0.5 to 3 μm - diameter of respirable , carcinogenic asbestos fibers (with a length of more than 8 μm)
• 1 μm - smallest scale division of a micrometer screw in the optical range (0.001)
• 3 μm - smallest plasmodia
• 10 μm and smaller - fine dust , mostly allergenic or otherwise harmful

## 10 μm to 100 μm

${\ displaystyle = 1 \ cdot 10 ^ {- 5} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 4} \, \ mathrm {m}}$

## 100 μm to 1 mm

${\ displaystyle = 1 \ cdot 10 ^ {- 4} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 3} \, \ mathrm {m}}$

## 1 mm to 1 cm (millimeters)

${\ displaystyle = 1 \ cdot 10 ^ {- 3} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 2} \, \ mathrm {m}}$

## 1 cm to 10 cm (centimeters)

${\ displaystyle = 1 \ cdot 10 ^ {- 2} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {- 1} \, \ mathrm {m}}$
• 2.22 or 2.38 cm - diameter bicycle handlebar tube in the grip area
• 2.54 cm = 1 inch
• 2.575 cm - diameter of the 2 euro coin
• 3.086 cm ≈ 3 cm - 1 attoparsec , is used ironically
• 3.5 cm - width of the 35mm film
• 7.2 cm - width of a 20 euro note

## 10 cm to 1 m

${\ displaystyle = 1 \ cdot 10 ^ {- 1} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {0} \, \ mathrm {m}}$
• 12 cm - diameter of a CD
• 12.25 cm - wavelength in the microwave oven (at 2.45 GHz )
• 17.78 cm - diameter of a single (7 record)
• 19.05 cm - wavelength GPS frequency (at 1.57542 GHz)
• 22 cm - approximate diameter of a soccer ball
• 30.48 cm = 1 foot = 12 inches
• 30.48 cm - the diameter of a long-playing record
• 60 cm - typical distance from railway sleepers
• ≈ 63 cm - the average stride length assumed in architecture for a person
• ≈ 73 cm = 1 step
• 0.9144 m = 1 yard = 3 feet

## 1 m to 10 m (meters)

${\ displaystyle = 1 \ cdot 10 ^ {0} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {1} \, \ mathrm {m}}$

## 10 m to 100 m

${\ displaystyle = 1 \ cdot 10 ^ {1} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {2} \, \ mathrm {m}}$

## 100 m to 1 km

${\ displaystyle = 1 \ cdot 10 ^ {2} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {3} \, \ mathrm {m}}$

## 1 km to 10 km (kilometers)

${\ displaystyle = 1 \ cdot 10 ^ {3} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {4} \, \ mathrm {m}}$

## 10 km to 100 km

${\ displaystyle = 1 \ cdot 10 ^ {4} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {5} \, \ mathrm {m}}$

## 100 km to 1000 km

${\ displaystyle = 1 \ cdot 10 ^ {5} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {6} \, \ mathrm {m}}$

## 1,000 km to 10,000 km

${\ displaystyle = 1 \ cdot 10 ^ {6} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {7} \, \ mathrm {m}}$

## 10,000 km to 100,000 km

${\ displaystyle = 1 \ cdot 10 ^ {7} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {8} \, \ mathrm {m}}$

## 100,000 km to 1,000,000 km

The diameter of Jupiter is about an order of magnitude (factor 0.10045) smaller than the sun and about an order of magnitude (factor 10.9733) larger than the earth
${\ displaystyle = 1 \ cdot 10 ^ {8} \, \ mathrm {m} {\ text {to}} 1 \ cdot 10 ^ {9} \, \ mathrm {m}}$
• 142,800 km - diameter of the planet Jupiter
• 299,792.458 km = 1 light second
• 384,000 km - mean distance of the moon from the earth

## Lengths greater than 1,000,000 km

${\ displaystyle> 1 \ cdot 10 ^ {9} \, \ mathrm {m}}$
• 1.39 million km - diameter of the sun
• 1.5 / 149/300 million km - distance of the Lagrange points 1, 2/4, 5/3 from the earth
• 17.99 million km = 1 light minute
• 57.91 million km - mean distance of Mercury from the sun
• 149.6 million km = 1 astronomical unit = 8.3 light minutes - mean distance between the earth and the sun
• 1.079 billion km = 1 light hour
• 1.427 billion km - mean distance of Saturn from the sun
• 5.9 billion km - the mean distance of Pluto from the sun
• 20.1 billion km - the distance of the Voyager 1 spacecraft to Earth in February 2016
• 25.902 billion km (2.5902 · 10 13 m) = 1 light day
• 9.46 trillion km (9.46 · 10 15 m) = 1 light year
• 30.857 trillion km (3.0857 · 10 16 m) = 1 parsec (pc) = about 3.26 light years
• 4.22 ly (approx. 1.3 pc or 40 · 10 12 km) - distance to the star closest to the Sun, Proxima Centauri
• 1 trillion km (1 · 10 21 m) - Estimated diameter of the Milky Way (about 33,000 pc)
• 23.84 trillion km (2.384 · 10 22 m) - distance of the Andromeda galaxy M31 (about 2.52 million light years )
• 9 million light years - length of the Virgo galaxy cluster
• up to 14 million light years - diameter of the local group (local galaxy cluster to which our Milky Way belongs)
• 150 to 200 million light years - diameter of the Virgo supercluster (galaxy supercluster containing the local group )
• 100 mega-parsec (= 326 million light years) - typical diameter of voids
• 500 million light years - the length of the Great Wall
• 1 billion light years - diameter of the largest known void and the Pisces-Cetus Supercluster Complex
• 1.37 billion light years - length of the Sloan Great Wall
• 4 billion light years - Huge Large Quasar Group (approx. Maximum extent) (1200 Mpc)
• 870 trillion km (8.7 10 26 m) - Estimated diameter of the observable universe (approx. 90 billion light years )