Arrow Weight Calculator
Build the Perfect Arrow.
Total weight. Front-of-centre balance. Component breakdown. Our free calculator gives you the full picture before you even nock an arrow — so nothing surprises you in the field.
What goes into an arrow
Every Grain Counts.
Arrow weight isn’t just one number — it’s the sum of every component. Our calculator tracks all of them individually so you know exactly where your weight is coming from.
01
Shaft
GPI × Length
Your shaft’s grains-per-inch rating multiplied by cut shaft length. Usually the largest single contributor to total weight.
02
Point / Broadhead
Grains
Field point or broadhead. Has the biggest single effect on FOC balance and spine selection.
03
Insert & Nock
Grains
Often overlooked but significant for FOC tuning. Brass inserts can push 50 gr+.
04
Fletching & Wrap
Vanes or Feathers
Enter weight per vane and count. A printed wrap adds 5–12 gr. Every grain counts at the rear.
Front of Centre
What is FOC?
Front-of-Centre (FOC) is the percentage of the arrow’s weight that sits forward of the midpoint. It determines how the arrow flies and penetrates — and it’s the single biggest variable hunters underestimate.
10–15%
Hunting — Optimal
7–9%
Target / General
< 7%
Too little — erratic flight
> 15%
High FOC — reduces range
Weight Calculator
Build Your Arrow
Arrow Weight Calculator
Enter every component. See weight, FOC and balance instantly.
Reading your results
What the Numbers Mean.
< 350 gr
Light Arrow
Fast and flat-shooting but less kinetic energy on impact. Best for small game or target archery.
350–450 gr
Mid-Weight
The most common hunting setup. Good balance of speed, trajectory and penetration for most applications.
450–650 gr
Heavy
Slower but more momentum. Preferred for dangerous game where pass-through penetration is critical.
650+ gr
Ultra Heavy
Traditional and dangerous game. Maximum momentum and straight-line penetration through bone.
Every Grain In Its Place.
Run your numbers, dial in your FOC, then shop the African Reaper shafts that match your exact build.