Arrow Speed Calculator

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Estimate arrow velocity and kinetic energy based on bow and arrow specs.

Setup Parameters

IBO Speed Rating (fps)

Draw Length (in)

Draw Weight (lbs)

Arrow Weight (grains)

String Weight (grains)

Performance Results

Enter parameters to calculate

About this calculator

Quick Reference

fpsFeet per second

ft-lbsKinetic Energy unit

Grains1/7000 of a pound

5 gr/lbMinimum safety standard

Overview

This calculator estimates the speed of an arrow using the industry-standard IBO (International Bowhunting Organization) adjustment method. It accounts for deviations from the standard 70lb/30"/350gr test setup.

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Pro Tips

Standard IBO test: 70 lbs draw weight, 30 inches draw length, 350 grain arrow.
Increasing arrow weight reduces speed but increases momentum and kinetic energy.
Weight on the string (peep sights, silencers) reduces speed (roughly 1 fps per 3 grains).

Fun Facts

"The fastest modern compound bows can reach IBO speeds over 360 fps."
"Arrow speed is not the only factor in hunting; 'momentum' is often considered more important for penetration."
"A typical modern hunting arrow travels about 300 feet per second—roughly one-third the speed of sound."

Formula: Speed ≃ IBO + (DL-30)*10 - (AW-DW*5)/3 - StringWeight/3