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Use our free Arrow Kinetic Energy Calculator to find arrow energy in Joules or Foot-Pounds. Simple steps, instant results, and clear formulas explained.
Ever wondered how powerful your arrow really is? Our Arrow Kinetic Energy Calculator helps you find that energy in seconds. It’s built for archers, hunters, and physics lovers who want quick, accurate results. You’ll see how your arrow’s weight and speed combine to create its total kinetic energy.
We’ve designed this tool so anyone can use it. You don’t need to be a scientist. Just enter your arrow’s mass and speed, and the calculator will show you the energy in both Joules and Foot-Pounds with clear steps you can follow.
Arrow kinetic energy is the amount of energy an arrow has when it’s moving. It shows how much power the arrow delivers when it hits a target. In simple terms, a heavier arrow or a faster arrow carries more energy.
Think of it like this: a small pebble tossed lightly won’t do much, but a rock thrown fast will hit harder. That’s kinetic energy at work.
The formula for kinetic energy in physics is:
KE = ½ × m × v²
Here:
In the archery world, we often use grains for mass and feet per second (fps) for speed. So the formula becomes:
KE (ft·lb) = (m × v²) / 450,240
This special version converts grains and fps directly into foot-pounds, the unit most archers use to measure arrow energy.
It’s quick and simple. Here’s what you do:
You’ll instantly see step-by-step calculations that explain how the result was found.
For example:
If your arrow weighs 350 grains and flies at 300 fps, then:
KE = (350 × 300²) / 450,240 = 69.96 ft·lb
That’s about 94.87 Joules in scientific units.
Knowing your arrow’s energy helps you choose the right setup for hunting or target practice. A higher kinetic energy means better penetration and accuracy. Hunters use it to pick the right draw weight, arrow type, and bow setup.
With this calculator, you can test different combinations to see how each change affects your shot power. You’ll understand your bow like a pro, even if you’re just starting out.
The Arrow Kinetic Energy Calculator is an easy, smart, and reliable way to find your arrow’s true energy. It uses real physics formulas but keeps things clear and simple. Whether you’re comparing arrows, testing speeds, or fine-tuning your setup — this tool gives you the answers fast.
You can use grains, grams, or kilograms for mass, and fps, m/s, mph, or km/h for speed.
Most archers use grains for mass and fps for speed, giving energy in foot-pounds.
Not always. More energy can mean deeper penetration, but balance matters. Arrow weight and bow draw weight must fit your purpose.
Yes. Choose “Both” in the result unit option, and you’ll see both values with full calculation steps.