Arrow Speed Calculator
Calculate arrow speed, momentum, and kinetic energy using IBO ratings and bow specifications. Professional archery calculator with comprehensive unit conversions.
IBO Standard: Based on 30" draw length, 70 lb draw weight, and 350 grain arrow. Adjustments: ±10 fps per inch of draw length, ±2 fps per pound of draw weight.
Results are estimates based on industry-standard IBO calculations.
Enter your bow specs and click Calculate to see arrow performance.
IBO Rating Explained
IBO (International Bowhunting Organization) rating is a standardized measurement based on a 30-inch draw length, 70-pound draw weight, and 350-grain arrow. This provides a baseline for comparing bow performance across different manufacturers.
Performance Factors
- Draw length: ±10 fps per inch change
- Draw weight: ±2 fps per pound change
- Arrow weight: ∓1 fps per 3 grains
- String accessories: ∓1 fps per 3 grains
Sample Calculation
Example:
IBO Rating: 320 fps
Draw Length: 29" (-1" from baseline)
Draw Weight: 60 lb (-10 lb from baseline)
Arrow Weight: 400 gr (+50 gr from baseline)
Result: 320 - 10 - 20 - 16.7 ≈ 273 fps
Momentum and kinetic energy are calculated using physics formulas: p = mv and KE = ½mv².