Crossbow Arrow Speed Calculator
Estimate real bolt speed and KE from published reference speed and your bolt weight.
Speed = Published Speed x sqrt(Reference Weight / Your Weight) x Efficiency. KE = (grains x fps x fps) / 450240.
FAQ
Why can real speed be lower than the box speed?
Published speeds are measured under strict test conditions. Real setups often use heavier bolts and practical hunting components.
Can I use this for light target bolts?
Yes, but always stay within manufacturer safety limits for minimum bolt weight.
What should I do after estimating speed?
Chronograph your exact setup and confirm actual point of impact at your intended distances.
Crossbow Speed Planning
This tool models first-pass FPS and KE changes from bolt mass differences. Use it to compare 400 grain, 425 grain, and 450 grain bolt setups before final range checks.