Muzzle Energy Computer

Bullet Weight (grains):    
Velocity (feet/second):     
Bullet diameter (inches):  
Energy (foot pounds):     
SD (Sectional Density):     

The top three rows above are active. Change any number and everything dependent on it will be recomputed.
Sectional Density (SD) in a function of bullet weight and diameter.

Sectional Density for Beginners: According to https://www.chuckhawks.com/sd_beginners.htm :

"Sectional density, according to the SpeerReloading Manual No. 13, is defined as: "A bullet's weight in
pounds divided by the square of its diameter in inches." Note that SD is independent of a bullet's shape."
“Sectional Density of .180 is good for small animals, .200-.230 is good for medium size animals,
.270-.280 is good for large animals, and .300+ is good for larger and tougher animals”

Bullet diameter list below.
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Muzzle Energy Formula: E = (M x V x V)/K

K = 450,435 and is derived from (2 x 32.1739 x 7000gr)*
M = weight of the projectile, in grains
V = velocity/speed  in feet per second (feet/second)
E = energy in foot pounds

 *The firearms industry's formula is: E = (M x V˛) ÷ K. (K = 450,435 which is a constant derived
 from 2 times the pull of gravity (2 x 32.1739) x 7000, (where 7000 is number of grains per pound).
1 pound force = 32.1739 pound mass foot per second squared
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Copyright © 2006 Bill St. Clair @ https://billstclair.com/energy.html
Modified by D. Nielsen 2016
Copying and reposting allowed as long as this copyright remains intact.
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Rifle Bullet Diameter List

The following list shows correct bullet diameters in thousandths of an inch and rifle cartridges that use bullets of each diameter.

Handgun Bullet Diameter List

The following list shows correct bullet diameters in thousandths of an inch and handgun cartridges that use bullets of each diameter.

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