# How fast is 0.000000263 times the speed of light?

It's about four times as fast as a Greyhound
The speed of a Greyhound is about 0.0000000670 times the speed of light.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.00000006710 times the speed of light. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about four times as fast as a Gazelle
The speed of a Gazelle is about 0.0000000700 times the speed of light.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 0.0000000700 times the speed of light. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about four times as fast as a Hare
The speed of a Hare is about 0.0000000700 times the speed of light.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 0.0000000700 times the speed of light. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about one-fourth as fast as The Speed of Sound
The speed of The Speed of Sound is about 0.000001140 times the speed of light.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.000001140 times the speed of light. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.000004990 times the speed of light to 0.00000520 times the speed of light in water, depending on its salinity.
It's about four-and-a-half times as fast as Secretariat
The speed of Secretariat is about 0.0000000560 times the speed of light.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 0.0000000560 times the speed of light in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about one-fifth as fast as a Bullet (Handgun)
The speed of a Bullet (Handgun) is about 0.000001280 times the speed of light.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 0.000001280 times the speed of light. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.
It's about seven-and-a-half times as fast as Michael Johnson
The speed of Michael Johnson is about 0.000000034520 times the speed of light.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 0.000000034530 times the speed of light at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about seven-and-a-half times as fast as Usain Bolt
The speed of Usain Bolt is about 0.00000003440 times the speed of light.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 0.00000003450 times the speed of light at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.
It's about one-tenth as fast as a Jet Fighter
The speed of a Jet Fighter is about 0.00000220 times the speed of light.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 0.00000220 times the speed of light. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about eight-and-a-half times as fast as Flo-Jo
The speed of Flo-Jo is about 0.000000031260 times the speed of light.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)
Setting a world record in 1988, Flo-Jo ran a 200 m in 0:21.34 for an average speed of 0.000000031260 times the speed of light. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about ten-and-a-half times as fast as Noah Ngeny
The speed of Noah Ngeny is about 0.000000025280 times the speed of light.
(in Rieti, Italy; 1999) (sprinter; 1978-)
Setting a world record at the Rieti Grand Prix in 1999, Noah Ngeny ran 1,000 m in 2:11.96 for an average speed of 0.000000025280 times the speed of light. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.
It's about one-tenth as fast as a Bullet (Rifle)
The speed of a Bullet (Rifle) is about 0.000003050 times the speed of light.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 0.000003050 times the speed of light. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about twelve times as fast as a Bull
The speed of a Bull is about 0.0000000220 times the speed of light.
(for animals involved in the Running of the Bulls, a.k.a. Encierro, San Fermin, Pamplona, Spain) (herd average speed)
The herd of the annual Encierro in Pamplona, Spain runs at an average speed of 0.0000000220 times the speed of light. The Encierro is run annually from July 7th through July 14th and involves 42 bulls, 77 oxen, and an estimated 17,000 runners over the course of the event.
It's about thirty times as fast as a Crocodile
The speed of a Crocodile is about 0.00000000900 times the speed of light.
(American Crocodile, Crocodylus acutus) (swimming speed)
An American crocodile can reach speeds in the water of up to 0.00000000930 times the speed of light. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 0.0000000190 times the speed of light.
It's about 40 times as fast as Michael Phelps
The speed of Michael Phelps is about 0.00000000647950 times the speed of light.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 0.00000000647950 times the speed of light. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
More Results