Science & Engineering

Arrow Speed Calculator (FPS from IBO Rating)

Estimate your arrow's speed in feet per second from the bow's IBO rating, draw weight, draw length, and arrow grain weight. You also get kinetic energy and momentum for judging hunting suitability.

How to use
  1. Enter the bow's IBO speed rating.
  2. Set your draw weight and draw length.
  3. Enter the total arrow weight in grains.
For study and estimation. Verify against authoritative data before relying on a result.
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Common questions

What is IBO speed?

IBO is a standard rating measured with a 70-lb draw, 30-inch draw length, and a 350-grain arrow. Your real speed drops as you move away from those settings.

How much kinetic energy do I need to hunt deer?

Most guides suggest at least 25 ft-lb of kinetic energy for deer-sized game, and 40 or more for larger animals.

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