Convert Centimetre to Astronomical Unit
1 centimetre = 0.00000000000006684587 astronomical unit (AU). For example, 10 centimetre = 0.0000000000006684587 astronomical unit and 100 centimetre = 0.000000000006684587 astronomical unit. Type any value below to convert centimetre to astronomical unit both ways — it runs entirely in your browser.
Quick answer: Centimetre to Astronomical Unit
1 Centimetre = 0.00000000000006684587 Astronomical Unit (cm → AU). To convert centimetre to astronomical unit, multiply by 0.00000000000006684587. To convert astronomical unit to centimetre, multiply by 14,959,790,000,000. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common centimetre-to-astronomical unit questions.
How to convert Centimetre to Astronomical Unit
To convert centimetre to astronomical unit, multiply the number of centimetre by the conversion factor 0.00000000000006684587, because 1 cm = 0.00000000000006684587 AU. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 AU = 14,959,790,000,000 cm, so you divide by 0.00000000000006684587 (or multiply by 14,959,790,000,000) to turn astronomical unit back into centimetre.
AU = cm × 0.00000000000006684587 ·
cm = AU × 14,959,790,000,000
- Write down the value you want to convert, in centimetre.
- Multiply it by 0.00000000000006684587.
- The result is the same area/length/quantity expressed in astronomical unit.
Centimetre to Astronomical Unit — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 centimetre is 0.0000000000003342294 astronomical unit because 5 cm × 0.00000000000006684587 = 0.0000000000003342294 AU.
| Centimetre | Calculation | Astronomical Unit |
|---|---|---|
| 1 cm | 1 cm × 0.00000000000006684587 = 0.00000000000006684587 AU | 0.00000000000006684587 AU |
| 2 cm | 2 cm × 0.00000000000006684587 = 0.0000000000001336917 AU | 0.0000000000001336917 AU |
| 3 cm | 3 cm × 0.00000000000006684587 = 0.0000000000002005376 AU | 0.0000000000002005376 AU |
| 5 cm | 5 cm × 0.00000000000006684587 = 0.0000000000003342294 AU | 0.0000000000003342294 AU |
| 7 cm | 7 cm × 0.00000000000006684587 = 0.0000000000004679211 AU | 0.0000000000004679211 AU |
| 10 cm | 10 cm × 0.00000000000006684587 = 0.0000000000006684587 AU | 0.0000000000006684587 AU |
| 12 cm | 12 cm × 0.00000000000006684587 = 0.0000000000008021505 AU | 0.0000000000008021505 AU |
| 15 cm | 15 cm × 0.00000000000006684587 = 0.000000000001002688 AU | 0.000000000001002688 AU |
| 20 cm | 20 cm × 0.00000000000006684587 = 0.000000000001336917 AU | 0.000000000001336917 AU |
| 25 cm | 25 cm × 0.00000000000006684587 = 0.000000000001671147 AU | 0.000000000001671147 AU |
| 50 cm | 50 cm × 0.00000000000006684587 = 0.000000000003342294 AU | 0.000000000003342294 AU |
| 100 cm | 100 cm × 0.00000000000006684587 = 0.000000000006684587 AU | 0.000000000006684587 AU |
Common Centimetre to Astronomical Unit conversions
These are the centimetre-to-astronomical unit values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 centimetre = 0.00000000000006684587 astronomical unit
- 2 centimetre = 0.0000000000001336917 astronomical unit
- 2.5 centimetre = 0.0000000000001671147 astronomical unit
- 3 centimetre = 0.0000000000002005376 astronomical unit
- 4 centimetre = 0.0000000000002673835 astronomical unit
- 5 centimetre = 0.0000000000003342294 astronomical unit
- 6 centimetre = 0.0000000000004010752 astronomical unit
- 7 centimetre = 0.0000000000004679211 astronomical unit
- 8 centimetre = 0.000000000000534767 astronomical unit
- 9 centimetre = 0.0000000000006016128 astronomical unit
- 10 centimetre = 0.0000000000006684587 astronomical unit
- 12 centimetre = 0.0000000000008021505 astronomical unit
- 15 centimetre = 0.000000000001002688 astronomical unit
- 20 centimetre = 0.000000000001336917 astronomical unit
- 25 centimetre = 0.000000000001671147 astronomical unit
- 30 centimetre = 0.000000000002005376 astronomical unit
- 50 centimetre = 0.000000000003342294 astronomical unit
- 75 centimetre = 0.00000000000501344 astronomical unit
- 100 centimetre = 0.000000000006684587 astronomical unit
- 200 centimetre = 0.00000000001336917 astronomical unit
- 500 centimetre = 0.00000000003342294 astronomical unit
- 1000 centimetre = 0.00000000006684587 astronomical unit
Centimetre to Astronomical Unit conversion chart (both directions)
The chart below converts centimetre to astronomical unit and astronomical unit to centimetre side by side, so it works whichever way you need. 1 centimetre = 0.00000000000006684587 astronomical unit, and 1 astronomical unit = 14,959,790,000,000 centimetre.
| Centimetre → Astronomical Unit | Astronomical Unit → Centimetre |
|---|---|
| 0.25 cm = 0.00000000000001671147 AU | 0.25 AU = 3,739,947,000,000 cm |
| 0.5 cm = 0.00000000000003342294 AU | 0.5 AU = 7,479,894,000,000 cm |
| 1 cm = 0.00000000000006684587 AU | 1 AU = 14,959,790,000,000 cm |
| 2 cm = 0.0000000000001336917 AU | 2 AU = 29,919,570,000,000 cm |
| 3 cm = 0.0000000000002005376 AU | 3 AU = 44,879,360,000,000 cm |
| 4 cm = 0.0000000000002673835 AU | 4 AU = 59,839,150,000,000 cm |
| 5 cm = 0.0000000000003342294 AU | 5 AU = 74,798,940,000,000 cm |
| 6 cm = 0.0000000000004010752 AU | 6 AU = 89,758,720,000,000 cm |
| 7 cm = 0.0000000000004679211 AU | 7 AU = 104,718,500,000,000 cm |
| 8 cm = 0.000000000000534767 AU | 8 AU = 119,678,300,000,000 cm |
| 9 cm = 0.0000000000006016128 AU | 9 AU = 134,638,100,000,000 cm |
| 10 cm = 0.0000000000006684587 AU | 10 AU = 149,597,900,000,000 cm |
| 12 cm = 0.0000000000008021505 AU | 12 AU = 179,517,400,000,000 cm |
| 15 cm = 0.000000000001002688 AU | 15 AU = 224,396,800,000,000 cm |
| 20 cm = 0.000000000001336917 AU | 20 AU = 299,195,700,000,000 cm |
| 25 cm = 0.000000000001671147 AU | 25 AU = 373,994,700,000,000 cm |
| 30 cm = 0.000000000002005376 AU | 30 AU = 448,793,600,000,000 cm |
| 40 cm = 0.000000000002673835 AU | 40 AU = 598,391,500,000,000 cm |
| 50 cm = 0.000000000003342294 AU | 50 AU = 747,989,400,000,000 cm |
| 75 cm = 0.00000000000501344 AU | 75 AU = 1,121,984,000,000,000 cm |
| 100 cm = 0.000000000006684587 AU | 100 AU = 1,495,979,000,000,000 cm |
| 150 cm = 0.00000000001002688 AU | 150 AU = 2,243,968,000,000,000 cm |
| 200 cm = 0.00000000001336917 AU | 200 AU = 2,991,957,000,000,000 cm |
| 250 cm = 0.00000000001671147 AU | 250 AU = 3,739,947,000,000,000 cm |
| 500 cm = 0.00000000003342294 AU | 500 AU = 7,479,894,000,000,000 cm |
| 1000 cm = 0.00000000006684587 AU | 1000 AU = 14,959,790,000,000,000 cm |
Centimetre vs Astronomical Unit: which is bigger?
A astronomical unit is the larger unit: one astronomical unit equals 14,959,790,000,000 centimetres. Put another way, you need 14,959,790,000,000 centimetres to make a single astronomical unit.
What is a Centimetre? History, origin and usage
The centimetre is one-hundredth of a metre, from the Latin centum, 'hundred'. It became prominent as the base length of the centimetre-gram-second (CGS) system used by many 19th- and early-20th-century physicists.
The centimetre is the everyday metric unit for small measurements such as human height, clothing sizes, paper and rulers across most of the world. It sits conveniently between the millimetre and the metre.
For decades scientists worked in the centimetre-gram-second system before the metre-kilogram-second system prevailed. A standard school ruler is typically 30 cm long.
What is a Astronomical Unit? History, origin and usage
The astronomical unit began as the average distance between the Earth and the Sun, a natural yardstick for the Solar System. Its older gravity-based definition subtly depended on the Sun's slowly decreasing mass, so in 2012 the International Astronomical Union redefined it as exactly 149,597,870,700 metres.
The astronomical unit is used to express distances within the Solar System, such as planetary orbits and spacecraft positions, where kilometres would be unwieldy. Earth orbits at one AU, while Neptune averages about 30 AU from the Sun.
Sunlight takes about 8 minutes and 20 seconds to cross one astronomical unit to Earth. The 2012 redefinition fixed the AU to an exact number of metres, ending its dependence on the constantly changing mass of the Sun.
Convert 1 Centimetre to other units
It can help to see a centimetre next to the other units it is commonly compared with. One centimetre (cm) is equal to:
| 1 Centimetre equals | Unit |
|---|---|
| 0.00001 km | Kilometre |
| 0.01 m | Metre |
| 0.1 dm | Decimetre |
| 10 mm | Millimetre |
| 10,000 µm | Micrometre |
| 0.000006213712 mi | Mile |
| 0.01093613 yd | Yard |
| 0.0328084 ft | Foot |
| 0.3937008 in | Inch |
| 0.000005399568 nmi | Nautical Mile |
| 0.0000497097 fur | Furlong |
| 0.000497097 ch | Chain |
| 0.0497097 li | Link |
| 0.001988388 rd | Rod |
| 0.001988388 pole | Pole |
| 0.005468066 ftm | Fathom |
| 0.0984252 hand | Hand |
| 0.04374453 span | Span |
| 0.08748906 finger | Finger |
| 0.02187227 cubit | Cubit |
| 0.00164042 rope | Rope |
| 0.0055 ken | Ken |
| 0.000002071237 lea | League |
| 28.34646 pt | Point |
| 0.00000000000006684587 AU | Astronomical Unit |
| 0.000000000000000001057001 ly | Light-year |
| 0.001 dam | Decametre |
| 0.0001 hm | Hectometre |
| 0.000001799856 nl | Nautical League |
Convert 1 Astronomical Unit to other units
One astronomical unit (AU) is equal to:
| 1 Astronomical Unit equals | Unit |
|---|---|
| 149,597,900 km | Kilometre |
| 149,597,900,000 m | Metre |
| 1,495,979,000,000 dm | Decimetre |
| 14,959,790,000,000 cm | Centimetre |
| 149,597,900,000,000 mm | Millimetre |
| 149,597,900,000,000,000 µm | Micrometre |
| 92,955,810 mi | Mile |
| 163,602,200,000 yd | Yard |
| 490,806,700,000 ft | Foot |
| 5,889,680,000,000 in | Inch |
| 80,776,390 nmi | Nautical Mile |
| 743,646,500 fur | Furlong |
| 7,436,465,000 ch | Chain |
| 743,646,500,000 li | Link |
| 29,745,860,000 rd | Rod |
| 29,745,860,000 pole | Pole |
| 81,801,110,000 ftm | Fathom |
| 1,472,420,000,000 hand | Hand |
| 654,408,900,000 span | Span |
| 1,308,818,000,000 finger | Finger |
| 327,204,400,000 cubit | Cubit |
| 24,540,330,000 rope | Rope |
| 82,278,830,000 ken | Ken |
| 30,985,270 lea | League |
| 424,057,000,000,000 pt | Point |
| 0.00001581251 ly | Light-year |
| 14,959,790,000 dam | Decametre |
| 1,495,979,000 hm | Hectometre |
| 26,925,460 nl | Nautical League |
Tips for converting Centimetre to Astronomical Unit
- To go from centimetre to astronomical unit, multiply by 0.00000000000006684587; to go back, divide by 0.00000000000006684587 (or multiply by 14,959,790,000,000).
- For a quick mental estimate, remember that 1 centimetre ≈ 0.00000000000006684587 astronomical unit, so 10 centimetre ≈ 0.0000000000006684587 astronomical unit.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Centimetre to Astronomical Unit converter
Type a number into the Centimetre field and the equivalent in Astronomical Unit appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Astronomical Unit field to convert the other way (astronomical unit to centimetre). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 cm = 0.00000000000006684587 AU), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for centimetre-to-astronomical unit conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
- NIST — Definitions of the SI base units — the US National Institute of Standards and Technology reference for the SI base units, used here as an independent cross-check on the base-unit definition.
The metric units (km, m, cm, mm, µm) are exact by definition, and the imperial units (mile, yard, foot, inch, nautical mile) use their exact international values. Traditional units (hand, span, finger, cubit, rod/pole, link, rope, ken, league) are given at their commonly accepted standard sizes — historical local values sometimes differed, so confirm against a primary source before relying on them for legal or historical work.
Frequently asked questions
- How many astronomical unit are in 1 centimetre?
- 1 centimetre = 0.00000000000006684587 astronomical unit (AU). To convert any number of centimetre to astronomical unit, multiply by 0.00000000000006684587.
- How do I convert centimetre to astronomical unit?
- Multiply the number of centimetre by 0.00000000000006684587. For example, 10 centimetre = 10 × 0.00000000000006684587 = 0.0000000000006684587 astronomical unit, and 25 centimetre = 0.000000000001671147 astronomical unit.
- How many centimetre are in 1 astronomical unit?
- 1 astronomical unit = 14,959,790,000,000 centimetre. So to convert astronomical unit back to centimetre, multiply by 14,959,790,000,000.
- What is the formula to convert centimetre to astronomical unit?
- astronomical unit = centimetre × 0.00000000000006684587. The reverse formula is centimetre = astronomical unit × 14,959,790,000,000.
- How much is 100 centimetre in astronomical unit?
- 100 centimetre = 0.000000000006684587 astronomical unit. (And 1000 centimetre = 0.00000000006684587 astronomical unit.)
- Which is bigger, a centimetre or a astronomical unit?
- A astronomical unit is larger: 1 astronomical unit = 14,959,790,000,000 centimetre.
- Is this centimetre to astronomical unit converter accurate?
- Yes — every value is computed from the exact 0.00000000000006684587 AU per cm factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert astronomical unit to centimetre too?
- Yes. The converter works both ways — enter a value in either field. 1 astronomical unit = 14,959,790,000,000 centimetre.