Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 fur | 1.345e-12 au | |
| 0.01 fur | 1.345e-11 au | |
| 0.1 fur | 1.345e-10 au | |
| 1 fur | 1.34471e-09 au | |
| 5 fur | 6.72353e-09 au | |
| 10 fur | 1.34471e-08 au | |
| 50 fur | 6.72353e-08 au | |
| 100 fur | 1.34471e-07 au | |
| 1000 fur | 1.34471e-06 au |
Multiply the number of Furlongs by 1.3447×10-9 to get Astronomical Units. Formula: au = fur × 1.3447×10-9. Example: 10 fur × 1.3447×10-9 = 1.3447×10-8 au. To reverse, divide Astronomical Units by 1.3447×10-9 to get Furlongs.
| Furlong (fur) | Astronomical Unit (au) |
|---|---|
| 0.001 fur | 1.3447×10-12 au |
| 0.01 fur | 1.3447×10-11 au |
| 0.1 fur | 1.3447×10-10 au |
| 0.5 fur | 6.7235×10-10 au |
| 1 fur | 1.3447×10-9 au |
| 2 fur | 2.6894×10-9 au |
| 5 fur | 6.7235×10-9 au |
| 10 fur | 1.3447×10-8 au |
| 20 fur | 2.6894×10-8 au |
| 50 fur | 6.7235×10-8 au |
| 100 fur | 1.34471e-07 au |
| 250 fur | 3.36176e-07 au |
| 500 fur | 6.72353e-07 au |
| 1000 fur | 1.34471e-06 au |
| 10000 fur | 1.34471e-05 au |
To convert Furlong to Astronomical Unit, multiply by 1.3447×10-9. Example: 10 fur = 1.3447×10-8 au
To convert Astronomical Unit back to Furlong, divide by 1.3447×10-9 (multiply by 743657000). Use the swap button above.
Start with 100 Furlongs = 1.34471e-07 au as your reference point. Scale up or down from there.
1 furlong = 1.345×10⁻⁹ AU. Educators use furlong-to-AU conversion to show how measurement spans from a medieval farm field to the Earth-Sun distance — bridging agricultural history with solar system astronomy.
The furlong was defined for ploughing ox teams around 700 AD. The AU was formalised in 2012. These two units span 1,300 years of human measurement evolution — from subsistence farming to space-age astronomy.
University physics courses assign furlong-to-AU problems in dimensional analysis units — the unusual pairing tests students' ability to work with obscure historical units alongside modern astronomical standards.
Popular science writers occasionally use furlong-to-AU to make solar system distances vivid for rural or equestrian audiences: "The Earth-Sun distance is 743 million furlongs — enough furrows to plough the surface of Mars."
Planetarium educators at venues near racecourses use furlong-to-AU as a bridge unit when explaining solar system scale to equestrian audiences — making cosmic distances tangible through a unit their audience already knows.
Complete unit conversion databases include furlong-to-AU for historical completeness and to serve researchers working across agricultural history, archaeological metrology, and astronomical instrumentation literature.
The Furlong is a unit of Length measurement (symbol: fur). 1 fur = 1.3447×10-9 au. Used in scientific and practical Length measurement applications.
The Astronomical Unit is a unit of Length measurement (symbol: au). It is part of an internationally recognised measurement system used alongside the Furlong.
The furlong — from Old English 'furlang', meaning furrow-long — was the standard length of one furrow ploughed by an ox team without resting, typically 220 yards. It dates to at least 8th-century England and was used to lay out the open-field system of medieval agriculture. The furlong's relationship to other units was carefully defined: 10 chains = 1 furlong, 8 furlongs = 1 mile. Today it survives almost exclusively in horse racing, where it remains the official distance unit in the UK, Ireland, and Australia.
The astronomical unit has ancient roots — Aristarchus of Samos attempted to measure the Earth-Sun distance around 270 BC. For centuries the AU was estimated using Venus transit observations. Edmond Halley organised the first coordinated international transit-of-Venus expedition in 1716. The modern value was determined by radar ranging to Venus in 1961. The IAU formally defined the AU as exactly 149,597,870,700 metres in 2012 — a fixed constant of physics, not a measured distance.
Common use: Furlong to Astronomical Unit conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.