Archery & Crossbow Calculators
Arrow speed, FOC, spine, kinetic energy, and drop math for compound, traditional, and crossbow setups.
Arrow Speed Estimator
Estimate arrow speed from a bow's IBO rating and your actual draw length, draw weight, and arrow weight. A ru…
Open calculator →Arrow FOC (Front of Center)
Standard Easton FOC formula from arrow length and balance point.
Open calculator →Draw Length Calculator
Estimate draw length from wingspan (AMO rule: wingspan ÷ 2.5).
Open calculator →Arrow Spine — General Starting Point
A general, non-brand-specific starting point. Manufacturer spine charts (Easton, Gold Tip, etc.) are propriet…
Open calculator →Arrow Kinetic Energy & Momentum
Energy and momentum from arrow weight and speed.
Open calculator →Total Arrow Weight & GPP
Add up arrow components and check grains per pound of draw weight.
Open calculator →Arrow Drop, Sight Pin Gaps & Yardage Tape Bonus
A simplified (no-drag) projectile-drop estimate — the standard simple approach most free arrow-drop calculato…
Open calculator →Treestand / Angle-Shot Horizontal Distance Bonus
The horizontal distance to aim for on a steep elevated or depressed shot.
Open calculator →Holding Weight from Let-Off Bonus
How much weight you actually hold at full draw.
Open calculator →Crossbow Bolt Drop with Multi-Reticle Scope Bonus
Simplified drop estimate to match your reticle's speed-calibrated lines.
Open calculator →Broadhead Penetration Reference: Energy vs. Momentum Bonus
Computes both numbers so you can weigh them against commonly cited bowhunting guidelines — momentum tracks pe…
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