Arrow Speed Calculator

Your details

Archery is almost universally measured in imperial units. Metric mode converts all inputs and outputs.
The manufacturer's IBO-rated speed. Find it on the bow's spec sheet or the manufacturer's website. IBO is measured at 70 lb draw, 30 in draw length, and a 350-grain arrow.
fps
Your actual draw length measured from the nock groove to the pivot point plus 1.75 inches. Each inch above 30 adds about 10 fps; each inch below 30 subtracts about 10 fps.
in
Your bow's peak draw weight, measured with a bow scale. Used only to calculate the arrow weight correction relative to the IBO standard.
lb
The fully built arrow weight including point, nock, fletching, and insert. The IBO standard uses 350 grains; each 5 grains above that costs about 1 fps.
grains
Total weight added to the string: peep sight, D-loop, silencers, etc. Every 3 grains of string weight costs approximately 1 fps. Enter 0 if bare string.
grains
Arrow SpeedLarge game (elk)
260fps

Estimated real-world arrow speed after adjusting the IBO rating

Arrow Speed79.25m/s
Kinetic Energy60ft-lb
Momentum104,000grain-fps
Speed Adjustment from IBO-50fps
260 fps
Below average<200Average200-250Good250-300Excellent300+

Estimated speed: 260.0 fps (good)

  • Your real-world arrow speed is 260.0 fps, which is good for an archery setup.
  • At 60.0 ft-lb of kinetic energy, this setup is appropriate for large game such as elk and black bear.
  • Your setup is 50.0 fps slower than the IBO lab rating, mainly because of your draw length or heavier arrow.
  • Arrow momentum is 104000 grain-fps. Higher momentum (from heavier arrows) improves penetration even when kinetic energy is similar.

Next stepYour setup meets the threshold for large game. Confirm your arrow is tuned (FOC, spine) for best accuracy at hunting distances.

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