Arrow Speed Calculator

Estimate real-world arrow speed from IBO rating by adjusting for draw length, arrow weight, and string accessories.

IBO Speed Rating

fps

Your Draw Length

Arrow Weight

String Accessories

Tab to move between fields

Estimated Speed

290 fps

Draw Length Penalty20 fps

Weight Penalty10 fps

How to Use This Calculator

Enter your bow's IBO Speed Rating from the manufacturer specs.
Set your actual Draw Length in inches and Total Arrow Weight in grains.
Enter String Accessories weight in grains (peep, D-loop, silencers).
Review your Estimated Real-World Speed in fps.
Check Draw Length Penalty and Weight Penalty to understand how your setup deviates from IBO conditions.

How the result changes with IBO Speed Rating

IBO Speed Rating: Manufacturer's IBO speed rating (measured at 70 lbs, 30", 350 gr).
Your Draw Length: Your actual draw length. Lose ~10 fps per inch under 30".
Arrow Weight: Total arrow weight in grains.
String Accessories: Weight of peep, D-loop, silencers, etc. on the string.

Identify Input Parameters
4 parameters
IBO Speed Rating = 330, Your Draw Length = 28, Arrow Weight = 400, String Accessories = 30 = 4 input(s) provided
Calculate Estimated Speed
Estimated Speed
290 = 290
Calculate Draw Length Penalty
Draw Length Penalty
20 = 20
Calculate Weight Penalty
Weight Penalty
10 = 10

Engine last updated July 26, 2026. Checked against 2 independently-derived tests — how we verify calculators.

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