Master Arrow Calculator
Build · Balance · Ballistics
1
Your Bow
From your bow's spec sheet or press-release card. Defaults are a solid starting point if you're not sure.
Draw Weight
70lbs
IBO Speed @30″
340fps
Draw Length
30in
Chrono Speed (optional) not set
fps · overrides
estimated speed
estimated speed
Measured speed at your arrow weight
2
Your Arrow
Type a total arrow weight, or switch on Detailed Build to work it out from components and get your FOC.
Arrow Weight
Grains
marked ◆ on chart
Detailed build (for FOC)
Enter what applies to your arrow — leave the rest at 0. This drives Total Weight and FOC, and auto-fills Arrow Weight above.
FOC (Front of Center) —
0%ideal 7–15%25%
3
Results
Updates live as you fill in your bow and arrow.
Target Distance
40yds
Shaded band on chart shows how far off your arrow hits if you misjudge the range by 3 yards
Performance vs. Arrow Weight
Hover for values · ◆ = My Build
Speed (fps)
KE (ft·lbs)
Momentum
Time to Target (sec)
±3yd Miss Window
Arrow Speed
—
Kinetic Energy
—
Momentum
—
FOC
—
GPP
—
Time to Target
—
±3 Yard Miss Window —
How we calculate this:
v(m) = baseline × √(377 / (m + 27)) · baseline = IBO + (DL−30)×10 + (DW−70)×2 · KE = m·v² / 450240 · %FOC = 100×(balance point − length/2) / length · Arrow Speed = v × 0.975 · Est. KE = KE × 0.97 · Virtual mass model fitted to chrono data (RMSE 1.14 fps, 4 bows, 16 points)