Convert Foot to Astronomical Unit
1 foot = 0.000000000002037462 astronomical unit (AU). For example, 10 foot = 0.00000000002037462 astronomical unit and 100 foot = 0.0000000002037462 astronomical unit. Type any value below to convert foot to astronomical unit both ways — it runs entirely in your browser.
Quick answer: Foot to Astronomical Unit
1 Foot = 0.000000000002037462 Astronomical Unit (ft → AU). To convert foot to astronomical unit, multiply by 0.000000000002037462. To convert astronomical unit to foot, multiply by 490,806,700,000. 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 foot-to-astronomical unit questions.
How to convert Foot to Astronomical Unit
To convert foot to astronomical unit, multiply the number of foot by the conversion factor 0.000000000002037462, because 1 ft = 0.000000000002037462 AU. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 AU = 490,806,700,000 ft, so you divide by 0.000000000002037462 (or multiply by 490,806,700,000) to turn astronomical unit back into foot.
AU = ft × 0.000000000002037462 ·
ft = AU × 490,806,700,000
- Write down the value you want to convert, in foot.
- Multiply it by 0.000000000002037462.
- The result is the same area/length/quantity expressed in astronomical unit.
Foot to Astronomical Unit — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 foot is 0.00000000001018731 astronomical unit because 5 ft × 0.000000000002037462 = 0.00000000001018731 AU.
| Foot | Calculation | Astronomical Unit |
|---|---|---|
| 1 ft | 1 ft × 0.000000000002037462 = 0.000000000002037462 AU | 0.000000000002037462 AU |
| 2 ft | 2 ft × 0.000000000002037462 = 0.000000000004074924 AU | 0.000000000004074924 AU |
| 3 ft | 3 ft × 0.000000000002037462 = 0.000000000006112386 AU | 0.000000000006112386 AU |
| 5 ft | 5 ft × 0.000000000002037462 = 0.00000000001018731 AU | 0.00000000001018731 AU |
| 7 ft | 7 ft × 0.000000000002037462 = 0.00000000001426224 AU | 0.00000000001426224 AU |
| 10 ft | 10 ft × 0.000000000002037462 = 0.00000000002037462 AU | 0.00000000002037462 AU |
| 12 ft | 12 ft × 0.000000000002037462 = 0.00000000002444955 AU | 0.00000000002444955 AU |
| 15 ft | 15 ft × 0.000000000002037462 = 0.00000000003056193 AU | 0.00000000003056193 AU |
| 20 ft | 20 ft × 0.000000000002037462 = 0.00000000004074924 AU | 0.00000000004074924 AU |
| 25 ft | 25 ft × 0.000000000002037462 = 0.00000000005093655 AU | 0.00000000005093655 AU |
| 50 ft | 50 ft × 0.000000000002037462 = 0.0000000001018731 AU | 0.0000000001018731 AU |
| 100 ft | 100 ft × 0.000000000002037462 = 0.0000000002037462 AU | 0.0000000002037462 AU |
Common Foot to Astronomical Unit conversions
These are the foot-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 foot = 0.000000000002037462 astronomical unit
- 2 foot = 0.000000000004074924 astronomical unit
- 2.5 foot = 0.000000000005093655 astronomical unit
- 3 foot = 0.000000000006112386 astronomical unit
- 4 foot = 0.000000000008149849 astronomical unit
- 5 foot = 0.00000000001018731 astronomical unit
- 6 foot = 0.00000000001222477 astronomical unit
- 7 foot = 0.00000000001426224 astronomical unit
- 8 foot = 0.0000000000162997 astronomical unit
- 9 foot = 0.00000000001833716 astronomical unit
- 10 foot = 0.00000000002037462 astronomical unit
- 12 foot = 0.00000000002444955 astronomical unit
- 15 foot = 0.00000000003056193 astronomical unit
- 20 foot = 0.00000000004074924 astronomical unit
- 25 foot = 0.00000000005093655 astronomical unit
- 30 foot = 0.00000000006112386 astronomical unit
- 50 foot = 0.0000000001018731 astronomical unit
- 75 foot = 0.0000000001528097 astronomical unit
- 100 foot = 0.0000000002037462 astronomical unit
- 200 foot = 0.0000000004074924 astronomical unit
- 500 foot = 0.000000001018731 astronomical unit
- 1000 foot = 0.000000002037462 astronomical unit
Foot to Astronomical Unit conversion chart (both directions)
The chart below converts foot to astronomical unit and astronomical unit to foot side by side, so it works whichever way you need. 1 foot = 0.000000000002037462 astronomical unit, and 1 astronomical unit = 490,806,700,000 foot.
| Foot → Astronomical Unit | Astronomical Unit → Foot |
|---|---|
| 0.25 ft = 0.0000000000005093655 AU | 0.25 AU = 122,701,700,000 ft |
| 0.5 ft = 0.000000000001018731 AU | 0.5 AU = 245,403,300,000 ft |
| 1 ft = 0.000000000002037462 AU | 1 AU = 490,806,700,000 ft |
| 2 ft = 0.000000000004074924 AU | 2 AU = 981,613,300,000 ft |
| 3 ft = 0.000000000006112386 AU | 3 AU = 1,472,420,000,000 ft |
| 4 ft = 0.000000000008149849 AU | 4 AU = 1,963,227,000,000 ft |
| 5 ft = 0.00000000001018731 AU | 5 AU = 2,454,033,000,000 ft |
| 6 ft = 0.00000000001222477 AU | 6 AU = 2,944,840,000,000 ft |
| 7 ft = 0.00000000001426224 AU | 7 AU = 3,435,647,000,000 ft |
| 8 ft = 0.0000000000162997 AU | 8 AU = 3,926,453,000,000 ft |
| 9 ft = 0.00000000001833716 AU | 9 AU = 4,417,260,000,000 ft |
| 10 ft = 0.00000000002037462 AU | 10 AU = 4,908,067,000,000 ft |
| 12 ft = 0.00000000002444955 AU | 12 AU = 5,889,680,000,000 ft |
| 15 ft = 0.00000000003056193 AU | 15 AU = 7,362,100,000,000 ft |
| 20 ft = 0.00000000004074924 AU | 20 AU = 9,816,133,000,000 ft |
| 25 ft = 0.00000000005093655 AU | 25 AU = 12,270,170,000,000 ft |
| 30 ft = 0.00000000006112386 AU | 30 AU = 14,724,200,000,000 ft |
| 40 ft = 0.00000000008149849 AU | 40 AU = 19,632,270,000,000 ft |
| 50 ft = 0.0000000001018731 AU | 50 AU = 24,540,330,000,000 ft |
| 75 ft = 0.0000000001528097 AU | 75 AU = 36,810,500,000,000 ft |
| 100 ft = 0.0000000002037462 AU | 100 AU = 49,080,670,000,000 ft |
| 150 ft = 0.0000000003056193 AU | 150 AU = 73,621,000,000,000 ft |
| 200 ft = 0.0000000004074924 AU | 200 AU = 98,161,330,000,000 ft |
| 250 ft = 0.0000000005093655 AU | 250 AU = 122,701,700,000,000 ft |
| 500 ft = 0.000000001018731 AU | 500 AU = 245,403,300,000,000 ft |
| 1000 ft = 0.000000002037462 AU | 1000 AU = 490,806,700,000,000 ft |
Foot vs Astronomical Unit: which is bigger?
A astronomical unit is the larger unit: one astronomical unit equals 490,806,700,000 foots. Put another way, you need 490,806,700,000 foots to make a single astronomical unit.
What is a Foot? History, origin and usage
The foot is one of the most ancient units, based on the length of a human foot, and appeared in the Greek, Roman, Chinese and English systems with values ranging from about 250 to 335 mm. The English foot was eventually fixed at 12 inches, and since the 1959 international agreement it equals exactly 0.3048 metres.
The foot is still used in the US and UK for human height, building dimensions and, worldwide, aviation altitudes, since pilots almost everywhere report altitude in feet. It divides into 12 inches, and three feet make a yard.
Aircraft altitudes are measured in feet even in fully metric countries, a legacy of aviation's English-speaking origins. Historically the foot's length differed not only between countries but sometimes between trades within a single city.
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 Foot to other units
It can help to see a foot next to the other units it is commonly compared with. One foot (ft) is equal to:
| 1 Foot equals | Unit |
|---|---|
| 0.0003048 km | Kilometre |
| 0.3048 m | Metre |
| 3.048 dm | Decimetre |
| 30.48 cm | Centimetre |
| 304.8 mm | Millimetre |
| 304,800 µm | Micrometre |
| 0.0001893939 mi | Mile |
| 0.3333333 yd | Yard |
| 12 in | Inch |
| 0.0001645788 nmi | Nautical Mile |
| 0.001515152 fur | Furlong |
| 0.01515152 ch | Chain |
| 1.515152 li | Link |
| 0.06060606 rd | Rod |
| 0.06060606 pole | Pole |
| 0.1666667 ftm | Fathom |
| 3 hand | Hand |
| 1.333333 span | Span |
| 2.666667 finger | Finger |
| 0.6666667 cubit | Cubit |
| 0.05 rope | Rope |
| 0.16764 ken | Ken |
| 0.00006313131 lea | League |
| 864 pt | Point |
| 0.000000000002037462 AU | Astronomical Unit |
| 0.00000000000000003221739 ly | Light-year |
| 0.03048 dam | Decametre |
| 0.003048 hm | Hectometre |
| 0.00005485961 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 Foot to Astronomical Unit
- To go from foot to astronomical unit, multiply by 0.000000000002037462; to go back, divide by 0.000000000002037462 (or multiply by 490,806,700,000).
- For a quick mental estimate, remember that 1 foot ≈ 0.000000000002037462 astronomical unit, so 10 foot ≈ 0.00000000002037462 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 Foot to Astronomical Unit converter
Type a number into the Foot 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 foot). 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 ft = 0.000000000002037462 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 foot-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
- NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary units. The inch, foot, yard and mile are defined exactly in metres by the 1959 international yard-and-pound agreement, so every imperial figure on this page is exact, not rounded.
- 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.
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 foot?
- 1 foot = 0.000000000002037462 astronomical unit (AU). To convert any number of foot to astronomical unit, multiply by 0.000000000002037462.
- How do I convert foot to astronomical unit?
- Multiply the number of foot by 0.000000000002037462. For example, 10 foot = 10 × 0.000000000002037462 = 0.00000000002037462 astronomical unit, and 25 foot = 0.00000000005093655 astronomical unit.
- How many foot are in 1 astronomical unit?
- 1 astronomical unit = 490,806,700,000 foot. So to convert astronomical unit back to foot, multiply by 490,806,700,000.
- What is the formula to convert foot to astronomical unit?
- astronomical unit = foot × 0.000000000002037462. The reverse formula is foot = astronomical unit × 490,806,700,000.
- How much is 100 foot in astronomical unit?
- 100 foot = 0.0000000002037462 astronomical unit. (And 1000 foot = 0.000000002037462 astronomical unit.)
- Which is bigger, a foot or a astronomical unit?
- A astronomical unit is larger: 1 astronomical unit = 490,806,700,000 foot.
- Is this foot to astronomical unit converter accurate?
- Yes — every value is computed from the exact 0.000000000002037462 AU per ft factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert astronomical unit to foot too?
- Yes. The converter works both ways — enter a value in either field. 1 astronomical unit = 490,806,700,000 foot.