I used to have a simple to use bullet energy calculator on my computer. All I had to do was enter the bullet weight and the muzzle velocity and it instantly gave me the energy of the bullet at the muzzle in fps. I lost it!

Does anyone have a link?

I think it was called something like a :Bullet Energy Comparator -

Thanks

Steve

Woops energy should be in ft/lbs not fps!

Mash Here

http://www.lasc.us/ConversionTables.htm

http://www.firearmexpertwitness.com/...s/calcnrg.html

Google is your friend.

It's not a complicated calculation:

Kinetic energy = ½*M*V²

V = velocity, in feet per second
M = bullet mass, in slugs

To convert bullet weight to slugs, divide the bullet's weight in grains by 7000 (the number of grains in a pound) to get the bullet's weight in pounds, then divide that result by 32.2 to convert it to a unit of mass.

So if you're in a position where you need to calculate energy, you can do it with the calculator on your phone, or an old-fangled pencil if need be:

Multiply the velocity by itself. Multiply that by bullet weight. Divide by 7000. Divide by 32.2. Multiply by 1/2. That's it. If you want to do it over and over, combine all the numbers in the denominator into a single constant (2*32.2*7000 = 450,800), then all you have to do is square the velocity, multiply by bullet weight in grains and divide by 450800.

On your slide rule, square the velocity. Multiply that times the bullet weight. Divide by 448.
(A 158 grain bullet at 900 fps and a 200 grain bullet at 800 fps seem to come out the same.)

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and what his trumpet saith

Now here is a statement of age - a slide rule!!
I only have two so I guess I'm that old as well.
Nice to see somerthing besides the word - calculator.
If you have Excel - you could use that as a program.

Here is one with a KO factor.

Energy Calculator

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Still Running Against the Wind

I don't have a slide rule to try that on, but if I do the same thing on a calculator, a 255 gr., 1000 fps load has over 569,000 foot-lb of energy.

That seems high.

It is.
Just use the claculator posted above that takes care of the units conversion.
Energy Calculator

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Science plus Art

Here's what I do:

Grain x velocity squared / 450436

I got 450436 by multiplying two times the acceleration of gravity (I used 32.174 fps) by 7,000 which is how many grains are in a pound.

Example: 255 grain at 1000 fps

255 x 1000 x 1000 / 450436 = 566 ft-lbs


Another example: 158 grain at 1450 fps

158 x 1450 x 1450 / 450436 = 737.5 ft-lbs

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- The Federalist #46 -

hornady has one here : Ballistics Calculator - Hornady Manufacturing, Inc

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JD 500