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Faster then a speeding bullet?


Regular Member
Jun 19, 2008
Prescott, Arizona, USA
multiply fps x 3600 (60 sec x 60 min) to give you feet per hour.

divide that number by 5280 (number of feet in a mile).

whalla, you've done it.


Regular Member
May 12, 2007
Western Prince William County, Virginia, USA
A common speed which most people can relate to is 60 MPH. At that speed, one is traveling 88 feet per second. So a bullet which leaves a barrel at, say, 1150 fps is traveling at

(1150 / 88) x 60 = 784 MPH rounded

This is a quick and dirty method which is easily remembered. Now for a common 5.56mm round...

(3200 / 88) x 60 = 2182 MPH rounded

Another figure that is interesting is how many RPM's does a bullet spin when it leaves a barrel? Let's take our 5.56mm round with a muzzle velocity of 3250 and figure this with a 1 in 12" rifling.

(12 / twist) x (3250 x 60) = 195000 RPM (where twist is 1:12)

(12 / twist) x (3250 x 60) = 146250 RPM (where twist is 1:16)


Well-known member
Jan 6, 2010
Fairborn, Ohio, USA
If you are looking for a quick & dirty, multiply by 7 and drop the last digit:

1150 * 7 = 8050. Drop the digit gives 805 (instead of 784.09--close enough).
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