How many furlongs are in 1 light-year?

One light-year contains approximately 4.703 x 1013 furlongs (about 47 trillion).

How fast does light travel in furlongs?

Light travels approximately 1.49 million furlongs per second, or about 149,000 Kentucky Derbys per second.

Is this conversion used?

Never. But expressing light-speed in furlongs per second is a popular physics joke.

Light-years to Furlongs (ly to fur) Converter

1 ly = 47,029,000,000,000 fur

1 Light-year equals 47,029,000,000,000 Furlongs (1 ly = 47,029,000,000,000 fur). Convert Light-years to Furlongs with formula, table, and examples.

One light-year equals approximately 4.703 x 10¹³ furlongs (about 47 trillion). The light-year measures stellar distances; the furlong (220 yards) measures horse races. The two most specialized distance units in English convert at a factor of 47 trillion.

How to Convert Light-years to Furlongs

fur = ly × 47,029,000,000,000

Multiply the value in Light-years by 47,029,000,000,000

Take your value in Light-years
Multiply by 47,029,000,000,000
Read the result in Furlongs

Common Light-years to Furlongs Conversions

Light-years (ly)	Furlongs (fur)	Status
1 × 10⁻¹³ ly	4.7029 fur
1 × 10⁻¹² ly	47.029 fur
1 × 10⁻¹¹ ly	470.29 fur
1 × 10⁻¹⁰ ly	4,702.9003 fur
1 × 10⁻⁹ ly	47,029.003 fur
1 × 10⁻⁸ ly	470,290.0299 fur
1 × 10⁻⁷ ly	4,702,900.2985 fur
0.000001 ly	47,029,002.9855 fur
0.00001 ly	470,290,029.8547 fur
0.0001 ly	4,702,900,298.5469 fur
0.001 ly	47,029,002,985.4689 fur
0.01 ly	470,290,029,854.6886 fur
0.1 ly	4,702,900,000,000 fur
1 ly	47,029,000,000,000 fur
4.24 ly	199,403,000,000,000 fur

Good to Know About Light-years to Furlongs Conversion

The 'furlong per fortnight' is a famous joke unit in physics, used to illustrate that any consistent unit system works mathematically. Light-speed in furlongs per fortnight is about 1.803 x 10¹². The joke proves that physics does not care about unit elegance.

Light-years to Furlongs: What You Need to Know

A furlong is 2.126 x 10^-14 light-years. The Kentucky Derby (10 furlongs) covers 2.126 x 10^-13 light-years. Light covers about 1 furlong in 0.67 microseconds. A racehorse covers it in 12 seconds. Light is faster.

What is a Light-year? ly

The distance light travels in one Julian year (365.25 days) in vacuum. Exactly 9,460,730,472,580,800 meters. Used for interstellar distances.

Astronomical interstellar distances astronomy popular science

Learn more about Light-year →

What is a Furlong? fur

Exactly 660 feet or one-eighth of a mile (201.168 m). Originally the length of a plowed furrow. Still used in horse racing.

Imperial horse racing historical

Learn more about Furlong →

Going the other way? Use our Furlongs to Light-years converter.

Light-years to Furlongs FAQ

One light-year contains approximately 4.703 x 10¹³ furlongs (about 47 trillion).
Light travels approximately 1.49 million furlongs per second, or about 149,000 Kentucky Derbys per second.
Never. But expressing light-speed in furlongs per second is a popular physics joke.

Non-Frequently Asked Questions About Light-years to Furlongs

Questions nobody should ask - but someone did.

Light travels about 1.49 million furlongs per second. The Derby is 10 furlongs. So light runs about 149,000 Kentucky Derbys per second. Secretariat's record time of 1:59.4 looks a bit slow in comparison.
No. Light travels 983 million feet per second. A horse gallops at about 88 feet per second. Light is 11.2 million times faster. No unit conversion, dimensional trick, or creative accounting makes a horse faster than light. Physics wins.
The Milky Way is about 100,000 light-years across = 4.7 x 10¹⁸ furlongs = 4.7 x 10¹⁷ Kentucky Derbys. Even if every star in the galaxy hosted a Derby simultaneously, they could not fill the galaxy with races.